private void button6_Click(object sender, EventArgs e)
{
Frm_RelationshipPrepaid frm = new Frm_RelationshipPrepaid();
frm.tb_clientcode.Text = tbCustID.Text;
frm.ShowDialog();
}
private void btn_relationship_Click(object sender, EventArgs e)
{
Frm_RelationshipPrepaid a = new Frm_RelationshipPrepaid();
a.tb_clientcode.Text = tb_customerid.Text;
a.ShowDialog();
}