I am getting this Exception When I am trying to access database from C#.

My Connection String is 

Data Source=(localdb)\v11.0;integrated security=true;User Instance = true;AttachDbFileName=C:\Users\UserName\Desktop\DB\TestDB3.mdf

Exception is

The user instance login flag is not allowed when connecting to a user instance of SQL Server. The connection will be closed.

localdb
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