C# : Unable to cast object of type 'System.DBNull' to type 'System.String`

C# : Unable to cast object of type 'System.DBNull' to type 'System.String`
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C# : Unable to cast object of type 'System.DBNull' to type 'System.String`
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of 'System.String` type C# to : Unable cast to type 'System.DBNull' object