private void BindDropdown()
{
OpenTyreDAL obj = new OpenTyreDAL();
var itemname = obj.BindPurchaseItemName();
obj = null;
ddlItemName.DataSource = itemname;
ddlItemName.DataTextField = "Item_Name";
ddlItemName.DataValueField = "Item_idno";
ddlItemName.DataBind();
ddlItemName.Items.Insert(0, new System.Web.UI.WebControls.ListItem("--Select--", "0"));
}