protected void ddlPOList_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
{
decimal batch_no = WebTools.DMaxchar("BATCH_NO", "PIP_PO_BATCH_PLAN", " WHERE PO_ID='" + ddlPOList.SelectedValue + "'");
txtBatchNo.Text = (batch_no + 1).ToString();
txtRevBatchNo.Text = (batch_no + 1).ToString();
txtRevNo.Text = "1";
}