protected void fill_period()
{
DataTable dt3 = bus.fetch_period();
if (dt3.Rows.Count > 0)
{
ddlper.DataSource = dt3;
ddlper.DataBind();
ddlper.Items.Insert(0, new ListItem("-----SELECT-----", ""));
}
else
{
ScriptManager.RegisterStartupScript(this, GetType(), "displayalertmessage", "warning();", true);
}
}