protected void Button2_Click(object sender, EventArgs e)
{
string receipt_id = query_receipt_id.Text;
string customer_name = txt_customer.Text;
string start_time = CalendarBox1.Text;
string end_time = CalendarBox2.Text;
ReceiptAuditAdapter raa = new ReceiptAuditAdapter();
show(raa.queryReceiptHeads(receipt_id, customer_name, start_time, end_time));
}