private void btnNew_Click(object sender, EventArgs e)
 {
     StudentRegistration Registration = new StudentRegistration();
     StudentRegistration.studentID = 0;
     Registration.ShowDialog();
     RefreshGrid();
     buttonSave.Focus();
 }
 private void dgvDetail_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
 {
     if (e.RowIndex >= 0)
     {
         int sID = int.Parse(dataGridViewStudentDetails["StudentID", e.RowIndex].Value.ToString());
         if (sID > 0)
         {
             //fills the values to controls
             StudentRegistration Registration = new StudentRegistration();
             StudentRegistration.studentID = sID;
             Registration.ShowDialog();
             RefreshGrid();
             buttonSave.Focus();
         }
     }
 }