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Permissions error when connecting .NET

When I try to connect a project developed in .NET with SQL Server as back end in the client system, the following error is displayed.
"Request for the permission of type, mscorlib, version = 1.0.3300.0, culture = neutral, public key = b77a5c561934e089 failed".

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I'm presuming this error actually says In that case, this won't be due to accessing SQL Server, at least the direct cause of the error. This error relates to your program not being able to perform I/O operations on a file on the disk. Check your CAS (code access security) settings for the program.

This was first published in January 2006

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