To Work With GridView In Outside Or Internal Event Of Any Control Except

To Work With GridView In Outside Or Internal Event Of Any Control Except


protected void txtDispQty_TextChanged(object sender, EventArgs e)
    {
 ltTotAmt.Text = "0";
    
        for (int i = 0; i < gvSaleDispatch.Rows.Count; i++)
        {
            if (((TextBox)gvSaleDispatch.Rows[i].FindControl("txtDispQty")).Text != "")
            {
                if (Convert.ToDouble(((TextBox)gvSaleDispatch.Rows[i].FindControl("txtDispQty")).Text) > Convert.ToDouble(((Label)gvSaleDispatch.Rows[i].FindControl("lblOrdQty")).Text))
                {
                    ((TextBox)gvSaleDispatch.Rows[i].FindControl("txtDispQty")).Text = "";
                    CloseWindow = "alert('Dispatch Quantity cant be greater than Ordered Quantity....');";
                    ClientScript.RegisterStartupScript(this.GetType(), "CloseWindow", CloseWindow, true);
                   
                }
                else if (Convert.ToDouble(((TextBox)gvSaleDispatch.Rows[i].FindControl("txtDispQty")).Text) > Convert.ToDouble(((Label)gvSaleDispatch.Rows[i].FindControl("lblAvailStock")).Text))
                {
                    ((TextBox)gvSaleDispatch.Rows[i].FindControl("txtDispQty")).Text = "";
                    CloseWindow = "alert('Dispatch Quantity cant be greater than Available Stock....');";
                    ClientScript.RegisterStartupScript(this.GetType(), "CloseWindow", CloseWindow, true);
                }
                else
                {
                    ((Label)gvSaleDispatch.Rows[i].FindControl("lbltot")).Text = String.Format("{0:0.00}", (Convert.ToDouble(((TextBox)gvSaleDispatch.Rows[i].FindControl("txtDispQty")).Text) * Convert.ToDouble(((Label)gvSaleDispatch.Rows[i].FindControl("lblRate")).Text)));
                    ltTotAmt.Text = String.Format("{0:0.00}", (Convert.ToDouble(ltTotAmt.Text) + Convert.ToDouble(((Label)gvSaleDispatch.Rows[i].FindControl("lbltot")).Text)));
                }
            }

        }
        ltTotPayableAmt.Text = ltTotAmt.Text;
}