private void btnAddnewCategory_Click(object sender, EventArgs e)
{
AddVehicleCategory avc = AddVehicleCategory.getInstance();
avc.Show();
this.Hide();
}
private void btnEdit_Click(object sender, EventArgs e)
{
//getting the card id
String cardId = this.txtCardID.Text;
AddVehicleCategory avC = AddVehicleCategory.getInstance();
avC.editcategory(cardId);
avC.Show();
this.Hide();
}