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	<title>Codelab Blog &#187; .NET Framework</title>
	<atom:link href="http://blog.codelab.co.nz/category/net-framework/feed/" rel="self" type="application/rss+xml" />
	<link>http://blog.codelab.co.nz</link>
	<description>Technical Articles and News from Codelab Ltd</description>
	<lastBuildDate>Tue, 17 Jan 2012 13:10:43 +0000</lastBuildDate>
	<language>en</language>
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		<item>
		<title>Perform ASP.NET Postback using JQuery</title>
		<link>http://blog.codelab.co.nz/2011/10/27/perform-asp-net-postback-using-jquery/</link>
		<comments>http://blog.codelab.co.nz/2011/10/27/perform-asp-net-postback-using-jquery/#comments</comments>
		<pubDate>Wed, 26 Oct 2011 23:47:24 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[ASP.NET]]></category>
		<category><![CDATA[jQuery]]></category>
		<category><![CDATA[.NET]]></category>
		<category><![CDATA[JQuery]]></category>
		<category><![CDATA[ViewState]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=363</guid>
		<description><![CDATA[Came across a situation where I needed to disable the ASP.NET button using JQuery when the user clicks on the button, this is so we stop the user from clicking the button twice while the page is doing a postback. Firstly, add the following JQuery/Javascript code: &#60;script&#62; &#160;function autoSubmit() &#160;{ &#160;&#60;%= ClientScript.GetPostBackEventReference(btnSaveChanges, &#34;&#34;) %&#62;; &#160;} [...]]]></description>
			<content:encoded><![CDATA[<p>Came across a situation where I needed to disable the ASP.NET button using JQuery when the user clicks on the button, this is so we stop the user from clicking the button twice while the page is doing a postback.</p>
<p>Firstly, add the following JQuery/Javascript code:</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">&lt;script&gt;<br />
<br />
&nbsp;function autoSubmit()<br />
&nbsp;{<br />
&nbsp;&lt;%= ClientScript.GetPostBackEventReference(btnSaveChanges, &quot;&quot;) %&gt;;<br />
&nbsp;}<br />
&nbsp; &nbsp; &nbsp;$(function () {<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;$(&quot;#&lt;%= btnSaveChanges.ClientID %&gt;&quot;).click(function () {<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;$(this).attr(&quot;disabled&quot;, &quot;true&quot;);<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;autoSubmit();<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;return false;<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;});<br />
&nbsp; &nbsp; &nbsp;});<br />
&lt;/script&gt;</div></div>
<p>You can inject the correct generated javascript code from using the function GetPostBackEventReference between the server tags.   Bind a click event to the ASP.NET server control which disables the button and call the autosubmit javascript function to perform a post back on the ASP.NET button control.   </p>
<p>References</p>
<p><a href="http://msdn.microsoft.com/en-us/library/ms153112.aspx" target="_blank">http://msdn.microsoft.com/en-us/library/ms153112.aspx</a></p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Some useful Extension Methods</title>
		<link>http://blog.codelab.co.nz/2011/09/06/some-useful-extension-methods/</link>
		<comments>http://blog.codelab.co.nz/2011/09/06/some-useful-extension-methods/#comments</comments>
		<pubDate>Tue, 06 Sep 2011 10:45:59 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[C#]]></category>
		<category><![CDATA[.NET]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=358</guid>
		<description><![CDATA[Back to basics&#8230; A couple of useful Extension methods if you are checking if a string is a valid integer or decimal. public static bool IsInteger(this string value) { if (String.IsNullOrEmpty(value)) return false; Int32 tmpNo; return Int32.TryParse(value, out tmpNo); } public static bool IsDecimal(this string value) { if (String.IsNullOrEmpty(value)) return false; Decimal tmpNo; return Decimal.TryParse(value, [...]]]></description>
			<content:encoded><![CDATA[<p>Back to basics&#8230;</p>
<p>A couple of useful Extension methods if you are checking if a string is a valid integer or decimal.</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">public static bool IsInteger(this string value)<br />
{<br />
if (String.IsNullOrEmpty(value)) return false;<br />
Int32 tmpNo;<br />
return Int32.TryParse(value, out tmpNo);<br />
}<br />
<br />
<br />
public static bool IsDecimal(this string value)<br />
{<br />
if (String.IsNullOrEmpty(value)) return false;<br />
Decimal tmpNo;<br />
return Decimal.TryParse(value, out tmpNo);<br />
}</div></div>
<p>To implement the Extension Methods:</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">var myString = &quot;10.5&quot;;<br />
<br />
if (myString.IsDecimal())<br />
<br />
{<br />
<br />
//Do something<br />
<br />
}</div></div>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>OrderBy making null records come last Entity Framework and Linq</title>
		<link>http://blog.codelab.co.nz/2011/07/28/orderby-making-null-records-come-last-entity-framework-and-linq/</link>
		<comments>http://blog.codelab.co.nz/2011/07/28/orderby-making-null-records-come-last-entity-framework-and-linq/#comments</comments>
		<pubDate>Wed, 27 Jul 2011 11:45:02 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[C#]]></category>
		<category><![CDATA[Lambda]]></category>
		<category><![CDATA[Linq]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=352</guid>
		<description><![CDATA[Ever want to sort your result set but make sure the records with a null sorting column appear last? See the example below var results = (from x in EntityObjectContext.MyTable &#160; &#160; &#160; &#160; &#160; &#160; &#160; select x &#160; &#160; &#160; &#160; &#160; &#160; &#160; into grp &#160; &#160; &#160; &#160; &#160; &#160; &#160; [...]]]></description>
			<content:encoded><![CDATA[<p>Ever want to sort your result set but make sure the records with a null sorting column appear last?<br />
See the example below</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">var results = (from x in EntityObjectContext.MyTable<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; select x<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; into grp<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; select new<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; mydata = grp,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myid = grp.id,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; mysortingentity = grp.mysortingentity<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;).OrderBy(x =&gt; sortingcolumn == null).ThenBy(x =&gt; x.mysortingentity.Name).ThenBy(x =&gt; x.myid);</div></div>
<p>Watch this space, this can easily be transformed into a Extension Method.  Check out this link <a href="http://tahirhassan.blogspot.com/2010/06/linq-to-sql-order-by-nulls-last.html">http://tahirhassan.blogspot.com/2010/06/linq-to-sql-order-by-nulls-last.html</a>, this Extension method works for LinqToSQL.</p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Finding StoreGeneratedPattern value in EdmProperty in T4 Template</title>
		<link>http://blog.codelab.co.nz/2011/05/11/finding-storegeneratedpattern-value-in-edmproperty-in-t4-template/</link>
		<comments>http://blog.codelab.co.nz/2011/05/11/finding-storegeneratedpattern-value-in-edmproperty-in-t4-template/#comments</comments>
		<pubDate>Wed, 11 May 2011 03:11:05 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[C#]]></category>
		<category><![CDATA[SQL Server]]></category>
		<category><![CDATA[T4 Templates]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=334</guid>
		<description><![CDATA[If you need to find out if a primary key in your conceptual model which is using the Identity value from the property StoreGeneratedPattern, you can use the following code: (NOTE: This is used within a T4 template) string inputFile = @&#34;..\EntitiesModel.edmx&#34;; EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile); string annotationNamespace = &#34;http://schemas.microsoft.com/ado/2009/02/edm/annotation&#34;; foreach (EntityType entity in ItemCollection.GetItems&#60;EntityType&#62;().OrderBy(e [...]]]></description>
			<content:encoded><![CDATA[<p>If you need to find out if a primary key in your conceptual model which is using the Identity value from the property StoreGeneratedPattern, you can use the following code: (NOTE: This is used within a T4 template)</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">string inputFile = @&quot;..\EntitiesModel.edmx&quot;;<br />
EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);<br />
string annotationNamespace = &quot;http://schemas.microsoft.com/ado/2009/02/edm/annotation&quot;;<br />
<br />
foreach (EntityType entity in ItemCollection.GetItems&lt;EntityType&gt;().OrderBy(e =&gt; e.Name)) {<br />
&nbsp; &nbsp;foreach (EdmProperty edmProperty in entity.Properties.Where(p =&gt; p.TypeUsage.EdmType is PrimitiveType &amp;&amp; p.DeclaringType == entity)) {<br />
&nbsp; <br />
&nbsp; &nbsp; &nbsp; MetadataProperty storeGeneratedPatternProperty = null;<br />
&nbsp; &nbsp; &nbsp; edmProperty.MetadataProperties.TryGetValue(annotationNamespace + &quot;:StoreGeneratedPattern&quot;, false, out storeGeneratedPatternProperty);<br />
<br />
&nbsp; &nbsp; &nbsp; if (storeGeneratedPatternProperty != null &amp;&amp; storeGeneratedPatternProperty.Value.ToString() == &quot;Identity&quot;) {<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;//We found an Identity property<br />
&nbsp; &nbsp; &nbsp; }<br />
&nbsp; &nbsp;}<br />
}</div></div>
]]></content:encoded>
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		</item>
		<item>
		<title>Back to Basics &#8211; Deleting Cookies using ASP.NET</title>
		<link>http://blog.codelab.co.nz/2011/05/11/back-to-basics-deleting-cookies-using-asp-net/</link>
		<comments>http://blog.codelab.co.nz/2011/05/11/back-to-basics-deleting-cookies-using-asp-net/#comments</comments>
		<pubDate>Tue, 10 May 2011 23:21:58 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[ASP.NET]]></category>
		<category><![CDATA[.NET]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=331</guid>
		<description><![CDATA[You cannot instruct ASP.NET to physically remove cookies from the user&#8217;s computer so you have to tell the user&#8217;s browser to modify the cookie in order to trigger the browser to remove the cookie. See code example: HttpCookie aCookie; string cookieName; int limit = Request.Cookies.Count; for (int i=0; i { cookieName = Request.Cookies[i].Name; aCookie = [...]]]></description>
			<content:encoded><![CDATA[<p>You cannot instruct ASP.NET to physically remove cookies from the user&#8217;s computer so you have to tell the user&#8217;s browser to modify the cookie in order to trigger the browser to remove the cookie.</p>
<p>See code example:</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">HttpCookie aCookie;<br />
string cookieName;<br />
int limit = Request.Cookies.Count;<br />
for (int i=0; i {<br />
cookieName = Request.Cookies[i].Name;<br />
aCookie = new HttpCookie(cookieName);<br />
aCookie.Expires = DateTime.Now.AddDays(-1);<br />
Response.Cookies.Add(aCookie);<br />
}</div></div>
<p>&nbsp;</p>
<p><strong><em>References:</em></strong></p>
<p><a title="Cookie Overview" href="http://msdn.microsoft.com/en-us/library/ms178194.aspx#Y5776" target="_blank">http://msdn.microsoft.com/en-us/library/ms178194.aspx#Y5776</a></p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>You receive a &#8220;The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect&#8221; exception when using NVarchar parameters with Sqlclient</title>
		<link>http://blog.codelab.co.nz/2010/08/26/you-receive-a-the-incoming-tabular-data-stream-tds-remote-procedure-call-rpc-protocol-stream-is-incorrect-exception-when-using-nvarchar-parameters-with-sqlclient/</link>
		<comments>http://blog.codelab.co.nz/2010/08/26/you-receive-a-the-incoming-tabular-data-stream-tds-remote-procedure-call-rpc-protocol-stream-is-incorrect-exception-when-using-nvarchar-parameters-with-sqlclient/#comments</comments>
		<pubDate>Thu, 26 Aug 2010 00:02:33 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[SQL Server]]></category>
		<category><![CDATA[.NET]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=292</guid>
		<description><![CDATA[The problem I got the following random error: You receive a &#8220;The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect&#8221; exception when using NVarchar parameters with Sqlclient The Solution Its a known bug with the .Net SqlClient Data Provider.   If you have a field in the database of type nvarchar(max) [...]]]></description>
			<content:encoded><![CDATA[<p>The problem</p>
<p>I got the following random error:<br />
</p>
<blockquote><p>You receive a &#8220;The incoming tabular data stream (TDS)  remote procedure call (RPC) protocol stream is incorrect&#8221; exception when  using NVarchar parameters with Sqlclient</p></blockquote>
<p>
The Solution</p>
<p>Its a known bug with the .Net SqlClient Data Provider.   If you have a field in the database of type nvarchar(max) or greater than 4000 characters and if the user enters data into the field greater than 4000 characters via the .Net SqlClient Data Provider you will receive an exception.</p>
<p>To get around this, reduce the field size to less that 4000 characters or change your type to ntext or set the Sqlparamter.size property to -1 to allow the entire data to be saved.</p>
<p><em><strong>References</strong></em></p>
<p><em><strong><br />
</strong></em><br />
<br />
<a href="http://support.microsoft.com/kb/970519">http://support.microsoft.com/kb/970519</a></p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Open XML &#8211; OLE Automation Date Issues</title>
		<link>http://blog.codelab.co.nz/2010/07/26/open-xml-ole-automation-date-issues/</link>
		<comments>http://blog.codelab.co.nz/2010/07/26/open-xml-ole-automation-date-issues/#comments</comments>
		<pubDate>Sun, 25 Jul 2010 12:16:20 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[C#]]></category>
		<category><![CDATA[.NET]]></category>
		<category><![CDATA[Excel]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=290</guid>
		<description><![CDATA[If you are exporting a date from C# to Excel using 2007, you probably will use the following: Math.Round(DateTime.Now.ToOADate(), 12).ToString() This exports the date as a OLE Automation date recognized by Excel 2007. How ever, in Excel 2010 this was causing issues, every time I exported to Excel 2010, it said that it has to [...]]]></description>
			<content:encoded><![CDATA[<p>If you are exporting a date from C# to Excel using 2007, you probably will use the following:</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">Math.Round(DateTime.Now.ToOADate(), 12).ToString()</div></div>
<p>This exports the date as a OLE Automation date recognized by Excel 2007.   How ever, in Excel 2010 this was causing issues, every time I exported to Excel 2010, it said that it has to repair my document and it never displayed the values correctly as dates.</p>
<p>Because I was using Open XML to generate the markup, Excel 2010 has been support for Open XML.   I got around the problem of using:</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">DateTime.Now.ToString(&quot;yyyy-MM-dd'T'HH:mm:ss.fffffffzzz&quot;);</div></div>
<p>This exports the date as a XML Date format.<br />
Hope this helps anyone who has the same problem!</p>
]]></content:encoded>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>EF Strongly Typed ObjectQuery.Include</title>
		<link>http://blog.codelab.co.nz/2010/07/13/ef-strongly-typed-objectquery-include/</link>
		<comments>http://blog.codelab.co.nz/2010/07/13/ef-strongly-typed-objectquery-include/#comments</comments>
		<pubDate>Mon, 12 Jul 2010 20:37:58 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[C#]]></category>
		<category><![CDATA[ADO.NET]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=274</guid>
		<description><![CDATA[The problem that I faced was having to put up with &#8220;hard coded&#8221; strings in the ObjectQuery.Include function to load related objects through POCO objects in the Entity Framework. This faced challenges when I renamed columns in the Model which caused a run-time error when recompiling and re-starting the application. Thanks to David Kiff, we [...]]]></description>
			<content:encoded><![CDATA[<p>The problem that I faced was having to put up with &#8220;hard coded&#8221; strings in the ObjectQuery.Include function to load related objects through POCO objects in the Entity Framework.   This faced challenges when I renamed columns in the Model which caused a run-time error when recompiling and re-starting the application.   Thanks to <a href="http://davidkiff.co.uk/author/David+Kiff.aspx">David Kiff</a>, we can now change the code from being strings:</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">using (CommuicationsEntities entities = new CommuicationsEntities())<br />
{<br />
entities.Order.Include(&quot;OrderDetails&quot;);<br />
}</div></div>
<p>To a nice strongly typed includes using a IncludeBuilder class.</p>
<div>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;height:300px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">public class IncludeBuilder<br />
{<br />
private readonly List _propertiesToInclude;<br />
<br />
public IncludeBuilder()<br />
{<br />
_propertiesToInclude = new List();<br />
}<br />
<br />
public void Add(Expression&lt;Func&lt;T, object&gt;&gt; propertySelector)<br />
{<br />
MemberExpression memberExpression = propertySelector.Body as MemberExpression;<br />
if (memberExpression == null)<br />
throw new ArgumentException(&quot;Parameter propertySelector must be a MemberExpression&quot;);<br />
_propertiesToInclude.Add(memberExpression.Member.Name);<br />
}<br />
<br />
public ObjectQuery Includes(ObjectQuery query)<br />
{<br />
foreach (string include in _propertiesToInclude)<br />
{<br />
query = query.Include(include);<br />
}<br />
return query;<br />
}<br />
}</div></div>
<p>the following code calls the include builder, includes the relationship and gets a simple list with no tracking on the POCO objects.</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">IncludeBuilder _include = new IncludeBuilder();<br />
_include.Add(a =&gt; a.Orders);<br />
ObjectQuery customers= DataContext.Servers;<br />
return _include.Includes(customers).Execute(MergeOption.NoTracking).ToList();</div></div>
<p><em><strong>References:</strong></em></p>
<p><a href="http://davidkiff.co.uk/post/2009/08/27/EF-Strongly-Typed-ObjectQuery3cT3eInclude%28e2809ce2809d%293b.aspx">http://davidkiff.co.uk/post/2009/08/27/EF-Strongly-Typed-ObjectQuery3cT3eInclude%28e2809ce2809d%293b.aspx</a></p>
</div>
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		<item>
		<title>Fixing the EF Tracing and Caching Provider Wrapper Issue</title>
		<link>http://blog.codelab.co.nz/2010/07/09/fixing-ef-tracing-caching-wrapper-issue/</link>
		<comments>http://blog.codelab.co.nz/2010/07/09/fixing-ef-tracing-caching-wrapper-issue/#comments</comments>
		<pubDate>Fri, 09 Jul 2010 04:20:59 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[C#]]></category>
		<category><![CDATA[.NET]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=268</guid>
		<description><![CDATA[If you have been using the Tracing and Caching Provider Wrappers for the ADO.NET Entity Framework 4.0, you might of come across this error message when creating POCO objects, adding them to a Data Context and commiting them to the database using the Caching Wrapper: [NotImplementedException: The method or operation is not implemented.] EFCachingProvider.EFCachingDataReaderCacheWriter.GetName(Int32 ordinal) [...]]]></description>
			<content:encoded><![CDATA[<p>If you have been using the <a href="http://code.msdn.microsoft.com/EFProviderWrappers">Tracing and Caching Provider Wrappers for the ADO.NET Entity Framework 4.0</a>, you might of come across this error message when creating POCO objects, adding them to a Data Context and commiting them to the database using the Caching Wrapper:<span style="font-family: Arial,Helvetica,Geneva,SunSans-Regular,sans-serif;"><br />
</span></p>
<pre>[NotImplementedException: The method or operation is not implemented.]
   EFCachingProvider.EFCachingDataReaderCacheWriter.GetName(Int32 ordinal) in EFCachingProvider\EFCachingDataReaderCacheWriter.cs:109
   System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues) +8118458
   System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) +267
</pre>
<p><span style="font-family: Arial,Helvetica,Geneva,SunSans-Regular,sans-serif;"> </span></p>
<pre>Line 107:        public override string GetName(int ordinal)
Line 108:        {
<span style="color: red;">Line 109:            throw new NotImplementedException();
</span>Line 110:        }
Line 111:
</pre>
<p>Basically, the author&#8217;s of the code have created a wrapper for the DBDataReader class and have not implement the override methods.   This can be fixed by calling the Wrapper DataReader object methods.  This is what I have modified in the EFCachignDataReaderCacheWriter.cs file:</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;height:300px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">using System;<br />
using System.Data;<br />
using System.Data.Common;<br />
using EFCachingProvider.Caching;<br />
<br />
namespace EFCachingProvider<br />
{<br />
///<br />
/// Implementation of the &nbsp;which reads the results of another data reader<br />
/// and stores a copy in the cache.<br />
///<br />
internal class EFCachingDataReaderCacheWriter : EFCachingDataReaderBase<br />
{<br />
private DbQueryResults queryResults = new DbQueryResults();<br />
private DbDataReader wrappedReader;<br />
private int maxRows;<br />
private Action addToCache;<br />
<br />
///<br />
/// Initializes a new instance of the EFCachingDataReaderCacheWriter class.<br />
///<br />
///<br />
&lt;span&gt; &lt;/span&gt;The wrapped reader. &nbsp; &nbsp; &nbsp; &nbsp; ///<br />
&lt;span&gt; &lt;/span&gt;The maximum number of rows which can be cached. &nbsp; &nbsp; &nbsp; &nbsp; ///<br />
The delegate used to add the result to the cache when the reader finishes. &nbsp; &nbsp; &nbsp; &nbsp; public EFCachingDataReaderCacheWriter(DbDataReader wrappedReader, int maxRows, Action addToCache)<br />
{<br />
this.wrappedReader = wrappedReader;<br />
this.addToCache = addToCache;<br />
this.maxRows = maxRows;<br />
}<br />
<br />
///<br />
/// Gets a value that indicates whether this &nbsp;contains one or more rows.<br />
///<br />
///<br />
/// true if the &nbsp;contains one or more rows; otherwise false.<br />
///<br />
public override bool HasRows<br />
{<br />
get { return this.wrappedReader.HasRows; }<br />
}<br />
<br />
///<br />
/// Gets the number of rows changed, inserted, or deleted by execution of the SQL statement.<br />
///<br />
///<br />
///<br />
/// The number of rows changed, inserted, or deleted. -1 for SELECT statements; 0 if no rows were affected or the statement failed.<br />
///<br />
public override int RecordsAffected<br />
{<br />
//get { throw new NotImplementedException(); }<br />
get { return this.wrappedReader.RecordsAffected; }<br />
}<br />
<br />
///<br />
/// Gets a value indicating whether the &nbsp;is closed.<br />
///<br />
///<br />
/// true if the &nbsp;is closed; otherwise false.<br />
///<br />
public override bool IsClosed<br />
{<br />
//get { throw new NotImplementedException(); }<br />
get { return this.wrappedReader.IsClosed; }<br />
}<br />
<br />
///<br />
/// Gets a value indicating the depth of nesting for the current row.<br />
///<br />
///<br />
///<br />
/// The depth of nesting for the current row.<br />
///<br />
public override int Depth<br />
{<br />
//get { throw new NotImplementedException(); }<br />
get { return this.wrappedReader.Depth; }<br />
}<br />
<br />
///<br />
/// Gets name of the data type of the specified column.<br />
///<br />
///<br />
The zero-based column ordinal. &nbsp; &nbsp; &nbsp; &nbsp; ///<br />
/// A string representing the name of the data type.<br />
///<br />
public override string GetDataTypeName(int ordinal)<br />
{<br />
//throw new NotImplementedException();<br />
return this.wrappedReader.GetDataTypeName(ordinal);<br />
}<br />
<br />
///<br />
/// Gets the data type of the specified column.<br />
///<br />
///<br />
The zero-based column ordinal. &nbsp; &nbsp; &nbsp; &nbsp; /// The data type of the specified column.<br />
public override Type GetFieldType(int ordinal)<br />
{<br />
return this.wrappedReader.GetFieldType(ordinal);<br />
}<br />
<br />
///<br />
/// Gets the name of the column, given the zero-based column ordinal.<br />
///<br />
///<br />
The zero-based column ordinal. &nbsp; &nbsp; &nbsp; &nbsp; /// The name of the specified column.<br />
public override string GetName(int ordinal)<br />
{<br />
return this.wrappedReader.GetName(ordinal);<br />
}<br />
<br />
///<br />
/// Gets the column ordinal given the name of the column.<br />
///<br />
///<br />
The name of the column. &nbsp; &nbsp; &nbsp; &nbsp; /// The zero-based column ordinal.<br />
///<br />
/// The name specified is not a valid column name.<br />
///<br />
public override int GetOrdinal(string name)<br />
{<br />
return this.wrappedReader.GetOrdinal(name);<br />
}<br />
<br />
///<br />
/// Returns a &nbsp;that describes the column metadata of the .<br />
///<br />
///<br />
/// A &nbsp;that describes the column metadata.<br />
///<br />
public override DataTable GetSchemaTable()<br />
{<br />
return this.wrappedReader.GetSchemaTable();<br />
}<br />
<br />
///<br />
/// Advances the reader to the next result when reading the results of a batch of statements.<br />
///<br />
///<br />
/// true if there are more result sets; otherwise false.<br />
///<br />
public override bool NextResult()<br />
{<br />
if (this.wrappedReader.NextResult())<br />
{<br />
this.queryResults = null;<br />
return true;<br />
}<br />
else<br />
{<br />
return false;<br />
}<br />
}<br />
<br />
///<br />
/// Closes the &nbsp;object.<br />
///<br />
public override void Close()<br />
{<br />
this.wrappedReader.Close();<br />
<br />
if (this.queryResults != null)<br />
{<br />
this.addToCache(this.queryResults);<br />
}<br />
}<br />
<br />
///<br />
/// Advances the reader to the next record in a result set.<br />
///<br />
///<br />
/// true if there are more rows; otherwise false.<br />
///<br />
public override bool Read()<br />
{<br />
if (this.wrappedReader.Read())<br />
{<br />
object[] values = new object[this.wrappedReader.FieldCount];<br />
<br />
this.wrappedReader.GetValues(values);<br />
SetValues(values);<br />
if (this.queryResults != null)<br />
{<br />
this.queryResults.Rows.Add(values);<br />
if (this.queryResults.Rows.Count &amp;gt; this.maxRows)<br />
{<br />
this.queryResults = null;<br />
}<br />
}<br />
<br />
return true;<br />
}<br />
else<br />
{<br />
return false;<br />
}<br />
}<br />
}<br />
}</div></div>
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		<item>
		<title>Detect when a session has ended ASP.NET</title>
		<link>http://blog.codelab.co.nz/2010/06/30/detect-when-session-ended/</link>
		<comments>http://blog.codelab.co.nz/2010/06/30/detect-when-session-ended/#comments</comments>
		<pubDate>Wed, 30 Jun 2010 03:32:02 +0000</pubDate>
		<dc:creator>Tim</dc:creator>
				<category><![CDATA[.NET Framework]]></category>
		<category><![CDATA[ASP.NET]]></category>
		<category><![CDATA[Visual Basic]]></category>
		<category><![CDATA[VB.NET]]></category>

		<guid isPermaLink="false">http://blog.codelab.co.nz/?p=259</guid>
		<description><![CDATA[A problem that I have had in the past is trying to find out when a session has expired within ASP.NET and how to deal with the expired session.   One solution is to add the following code into the Page_Init event.   You can add this event into a class that inherits the Page class so [...]]]></description>
			<content:encoded><![CDATA[<p>A problem that I have had in the past is trying to find out when a session has expired within ASP.NET and how to deal with the expired session.   One solution is to add the following code into the Page_Init event.   You can add this event into a class that inherits the Page class so that you can reuse on more than one page or all pages if needed.</p>
<div class="codecolorer-container text default" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;"><div class="text codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap">If Not Context.Session Is Nothing Then<br />
If Session.IsNewSession Then<br />
Dim szCookieHeader As String = Request.Headers(&quot;Cookie&quot;)<br />
If Not String.IsNullOrEmpty(szCookieHeader) And szCookieHeader.IndexOf(&quot;ASP.NET_SessionId&quot;) &amp;gt;= 0 Then<br />
Response.Redirect(&quot;/sessiontimeoutpage.aspx&quot;)<br />
End If<br />
End If<br />
End If</div></div>
<p>This code checks if a new session has been created and if the header has a ASP.NET Session id.   This makes sure that we are checking for a session that has just been created.</p>
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