QUERY String on Gridview in ASP.NET

SET GRIDVIEW PROPERTY HYPERLINK FIELDS 

DATANAVIGATEURL :  bdetail.aspx?sno={0}+&name={1}+&cost={2}+&ocost={3}+&bcost={4}+&bid={5}

QUERY STRING CALL PAGE LOAD 

        TextBox4.Text = Request.QueryString["sno"];

        TextBox5.Text = Request.QueryString["name"];

        TextBox10.Text = Request.QueryString["cost"];

        TextBox6.Text = Request.QueryString["bcost"];

        TextBox9.Text = Request.QueryString["bid"];