by default first item select fromthe dropdown on selection change

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.NET2.0

.NET

Dear All,

I have two dropdowns, ddlproduct and ddlesnNo.

When selecting product it works fine, but in the case of ddlesnNo, the first item is selected even when selecting other items.
I have set the property of autopostback is true and I'm using update panel.

Asynchronous trigger is also fired for ddlesnNo (Dropdown) Selected_Index_changed

See the below code

protected void ddlESNList_SelectedIndexChanged(object sender, EventArgs e)
    {

if (ddlESNList.SelectedItem.Value != "")
        {
            // fill product in dropdownlist
            ProductEntiry productObj = new ProductEntiry();
            BALProduct bproductObj = new BALProduct();
            productObj.Productid = 0;
            productObj.Productname = ddlProductName.SelectedItem.Text;
            productObj.Mrp = 0.0;
            productObj.Description = null;
            productObj.Status = "A";
            DataTable dtb = bproductObj.FillProductBAL(productObj);
            if (dtb.Rows.Count > 0)
            {
                txtMrp.Text = Convert.ToString(dtb.Rows[0]["P_MRP"]);
                txtRatePcs.Text = Convert.ToString(dtb.Rows[0]["P_Sales"]);
                //ddlESNList.Items.RemoveAt(ddlESNList.SelectedIndex);
            }
            else
            {
                txtMrp.Text = "";
                txtRatePcs.Text = "";

                //Message Display
                string msg = "<script type='text/javascript'>";
                msg += " alert('No Item Data Found!!')";
                msg += "</script>";
                ClientScript.RegisterClientScriptBlock(typeof(Page), "message", msg);
            }
        }
        else
        {
            //Message Display
            string msg = "<script type='text/javascript'>";
            msg += " alert('Select Product from the list!!')";
            msg += "           ClientScript.RegisterClientScriptBlock(typeof(Page), "message", msg);
        }
}