private void btnTeacherData_Click(object sender, EventArgs e)
 {
     this.teacherData = new TeacherDataTable();
     this.OpenForms(this.teacherData);
 }
 public TeacherIndex()
 {
     InitializeComponent();
     this.teacherData = new TeacherDataTable();
     this.OpenForms(this.teacherData);
 }