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This is bizarre.<br />
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I've been doing ASP for over 10 years and I've never seen this before. &nbsp; The below line of code is failing. &nbsp;Why? &nbsp;I've re-assigned values to collection keys dozens of times. &nbsp;Why would this start complaining now?<br />
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The error message:<br />
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&nbsp;Item has already been added. Key in dictionary: 'MyKey' Key being added: 'MyKey' <br />

<pre><code id="code-294744">Session[&quot;MyKey&quot;] = &quot;some string&quot;
</code></pre>
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This is bizarre.

I've been doing ASP for over 10 years and I've never seen this before.   The below line of code is failing.  Why?  I've re-assigned values to collection keys dozens of times.  Why would this start complaining now?

The error message:

 Item has already been added. Key in dictionary: 'MyKey' Key being added: 'MyKey' 

ASP.Net: Session Object: Item has already been added. Key in dictionary: 'MyKey' Key being added: 'MyKey'

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications