private void AddStudent_Click(object sender, EventArgs e)
{
AddOrUpdaetStudent student = new AddOrUpdaetStudent();
student.ShowDialog();
Refresh();
}
private void btnUpdate_Click(object sender, EventArgs e)
{
int id = int.Parse(dgStudent.SelectedCells[0].FormattedValue.ToString());
var studentModel = GloblMain.dbo.StudentDMs.Find(id);
AddOrUpdaetStudent student = new AddOrUpdaetStudent(studentModel);
student.ShowDialog();
Refresh();
}