public void Preview()
{
SchoolManagement.salesbillno = invoiceno.ToString();
SchoolManagement.sladmno = admno;
SchoolManagement.slname = sname;
SchoolManagement.sldiscount = Convert.ToDouble(txt_discount.Text);
SchoolManagement.sltotal = Convert.ToDouble(txt_Amount.Text);
tbsPreview.Enabled = false;
tsbPrint.Enabled = false;
tsbNewInvoice.Enabled = true;
groupBox1.Enabled = false;
groupBox2.Enabled = false;
groupBox3.Enabled = false;
groupBox4.Enabled = false;
groupBox5.Enabled = false;
dgv_PurchaseDetails.DataSource = "";
dataGridView1.DataSource = "";
dgv_Studentlist.DataSource = "";
dgv_itemlist.DataSource = "";
txt_Amount.Text = "0";
lbl_billamt.Text = "0";
SalesBillPrivew s = new SalesBillPrivew();
d.con_close();
s.Show();
}
private void toolStripButton1_Click(object sender, EventArgs e)
{
SchoolManagement.salesbillno = invoiceno.ToString();
SchoolManagement.sladmno = admno;
SchoolManagement.slname = sname;
SchoolManagement.sldiscount = Convert.ToDouble(txt_discount.Text);
SchoolManagement.sltotal = Convert.ToDouble(txt_Amount.Text);
SalesBillPrivew s = new SalesBillPrivew();
d.con_close();
s.Show();
}