I am getting this error list when debugging my project also the project can not connect to sql server in debugging mode.

A first chance exception of type 'System.Configuration.ConfigurationErrorsException' occurred in System.Configuration.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in System.Data.dll
A first chance exception of type 'System.TypeInitializationException' occurred in System.Transactions.dll
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll