private void btnupdate_Click(object sender, EventArgs e)
{
ClsSqlServer objupdate = new ClsSqlServer();
objupdate.UpdateCustomer(txtapartiment.Text, txtfname.Text, txtlname.Text, cmbgender.Text, txtphone.Text, cmbpayment.Text, dTPicker1.Value);
MessageBox.Show("Data Updated Successfully");
txtapartiment.Text = "";
txtfname.Text = "";
txtlname.Text = "";
cmbgender.Text = "";
txtphone.Text = "";
cmbpayment.Text = "";
dTPicker1.Value = DateTime.Today;
}