protected void gv_AllCourse_RowCommand(object sender, GridViewCommandEventArgs e) { course = new Course(); Courses courses = new Courses(); if (e.CommandName == "Accept") { courses.CourseId = Convert.ToInt32(e.CommandArgument); if (course.AcceptCourse(courses) == true) { lbl_Msg.Text = "Accept Course"; } else { lbl_Msg.Text = "there are wrong ..."; } } }