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علت خطای زیر چیست؟ SqlConnection _con = new  SqlConnection ("Data Source = .; Initial Catalog = Shop3; Integrated Security = true;"); _con.Open(); SqlCommand  cmd = new  SqlCommand (" select * from Customer "); SqlDataReader  reader = cmd.ExecuteReader(); while ( reader.Read() ) { Console.WriteLine("Customer Code: {0}nCustomer Name {1}nCustomer ...