private void button3_Click(object sender, EventArgs e)
{
DataSet ds = db.GetTableData("select * from VEW_BILL_REGISTER where invoice_date between '" + DtpFrm.Value.ToString("dd-MMM-yy") + "' and '" + DtpTo.Value.ToString("dd-MMM-yy") + "'");
dataGridView1.DataSource = ds.Tables[0];
db.ExportToExcel(dataGridView1);
}
private void button2_Click(object sender, EventArgs e)
{
db.ExportToExcel(DgvList);
}