getting error code while connecting to sql server

2018-06-09 07:43:29

I am getting an error

A first chance exception of type 'System.NullReferenceException' occurred in WindowsFormsApplication2.exe

Additional information: Object reference not set to an instance of an object.

If there is a handler for this exception, the program may be safely continued.]

during connecting to sql server 2012 from my visual studio for c#. when debugged pointing the error is at :

connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString;

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