private void addStaffBtn_Click(object sender, EventArgs e)
{
add_Staff = new add_staff();
add_Staff.Show();
FillGrid();
this.Close();
}
private void editBtn_Click(object sender, EventArgs e)
{
add_Staff = new add_staff();
add_Staff._ID = Convert.ToInt32(dgvStaff.CurrentRow.Cells[0].Value.ToString());
add_Staff.btnSave.Text = "Update";
add_Staff.btnSave.ImageKey = "update.png";
add_Staff.Text = "Update Staff";
add_Staff.Show();
FillGrid();
this.Close();
}