What are the secure communication technologies available in Asp.NET?

1. SSL / TLS
2. IPSec
3. RPC Encryption

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What is Multi-Targetting in .net?

Using it you can use Visual Studio 2008 to create projects that target .NET Framework version 2.0, 3.0, or 3.5.

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How can i persist my session state when my page hit an error?

By calling Server.ClearError();

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