'System.Data.SqlClient.SqlConnection' in Assembly is not marked as serializable?

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I occured this error in asp.net & C# 'System.Data.SqlClient.SqlConnection' in Assembly 'System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable..what is the reason for this type of error ocured in asp.net & c#.

asked 43 secs ago

rajeeshmenoth

19

'System.Data.SqlClient.SqlConnection' in Assembly is not marked as serializable?