gistfile1.txt

string cmdsql = "INSERT INTO [dbo].[ttt] ([yn], [gn], [an], [sc], [am]) VALUES (11, 12, 13, 14, 15)";
                SqlConnection sql = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\bin\Debug\liusql.mdf;Integrated Security=True;Connect Timeout=30");
                SqlCommand cmd = new SqlCommand(cmdsql, sql);
                sql.Open();
                cmd.ExecuteNonQuery();
                sql.Close();