private void tsbAdd_Click(object sender, EventArgs e) { if (txtCourseName.Text == "") { MessageBox.Show("请输入科目名称!"); } else { if (CourseBll.GetCourse(txtCourseName.Text)) { try { CourseBll.CourseAdd(txtCourseName.Text); dataGridView1.DataSource = CourseBll.CourseFillDs().Tables[0]; getcolumn(); MessageBox.Show("添加成功!"); } catch (Exception ee) { MessageBox.Show("添加失败!" + ee); throw; } } else { MessageBox.Show("科目已存在!"); } } }