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'Operation is not valid due to the current state of the object' error during postback
I had an aspx page which was working well, but suddenly I am getting the error "Operation is not valid due to the current state of the object." whenever a postback is done.
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Origin is not allowed by Access-Control-Allow-Origin
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If you have an ASP.NET / ASP.NET MVC application, you can include this header via the Web.config file:
<system.webServer>
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<httpProtocol>
<customHeaders>
<!-- Enable Cross Domain AJAX call...
HtmlString vs. MvcHtmlString
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HtmlString only exists in ASP.NET 4.
MvcHtmlString was a compatibility shim added to MVC 2 to support both .NET 3.5 and .NET 4. Now that MVC 3 is .NET 4 only, it's a fairly trivial subclass of HtmlString presumably for MVC 2->3 for source compatib...
I get a “An attempt was made to load a program with an incorrect format” error on a SQL Server repli
... It might be worth noting that this AppPool solution only applies to ASP.NET applications - could confuse some devs that never used/configured ASP.NET or IIS.
– galaktor
Apr 11 '11 at 7:38
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How can I get the client's IP address in ASP.NET MVC?
I'm totally new to the ASP.NET MVC stack, and I was wondering what happened to the simple Page object and the Request ServerVariables object?
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Regex to test if string begins with http:// or https://
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Making this case insensitive wasn't working in asp.net so I just specified each of the letters.
Here's what I had to do to get it working in an asp.net RegularExpressionValidator:
[Hh][Tt][Tt][Pp][Ss]?://(.*)
Notes:
(?i) and using /whatever/i didn't work probably be...
“The breakpoint will not currently be hit. The source code is different from the original version.”
... back:
C:\Documents and Settings\%username%\AppData\Local\Temp\Temporary
ASP.NET Files
C:\windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET
Files
I finally resolved the problem when I discovered that a class file I had intentionally moved into a subfolder, somehow reappeared in the ro...
The type or namespace name does not exist in the namespace 'System.Web.Mvc'
...mbly references on every project in the solution, anything with "Microsoft ASP.NET\ASP.NET MVC 3\Assemblies" or the like in the path is part of the problem.
– Task
Nov 14 '14 at 16:41
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The Role Manager feature has not been enabled
...s MSDN sample: https://msdn.microsoft.com/en-us/library/aa354509(v=vs.110).aspx
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How can I solve a connection pool problem between ASP.NET and SQL Server?
The last few days we see this error message in our website too much:
22 Answers
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