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You can find a lot of debugging and deploying problems while developing applications in .NET and Visual Basic here. There are also some querying tips in SQL and typical source codes which might be useful shared here.

Access to Temp Directory is Denied

Error:
When deploying application and viewing the web page, the following error occurs:
Access to the temp directory is denied.
Identity 'IIS APPPOOL\WebAppPool' under which XmlSerializer is running does not have sufficient permission to access the temp directory. CodeDom will use the user account the process is using to do the compilation, so if the user doesnt have access to system temp directory, you will not be able to compile. Use Path.GetTempPath() API to find out the temp directory location.

Solution:
Go to IIS, change advanced settings of the application pool used for the website, then under Process Model Category, change the Identity to ApplicationPoolIdentity.
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Cannot Display Web Page on IIS due to Configuration Error

Error:

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

Config Error: There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined
Config File:  Application\Web\web.config

The error on IIS 7.5 should look like this.


Solution:
Open web.config, and then comment out the "system.web.extensions" sectionGroup under configSections tag.
For example:
<!--<sectiongroup name="system.web.extensions">
............
............
...........
</sectiongroup>-->
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