Open popup by clicking on link button on gridview

hi friends
 

i have a one problem that is first i fill up the form of student details after
those details will be placed in one gridview with linkbutton as studentid


what is my doubt is if i click that linkbutton on gridview those that button id information is open on popup for update purpose....


why problem is how can i open that popup by clicking on link button

please give me the code for this one please............


one hint:
---------
all the code will be placed inside the div
that code will be like this












 public void lnkRenewalID_Click(object sender, System.EventArgs e)
        {
            //if (e.CommandName == "Text")
            //{
            //    int id = int.Parse(e.CommandArgument.ToString());
                //string tmp = "";
                //tmp = "";
                //Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "MyScript", tmp);
           
                LinkButton lbRenewalID = (LinkButton)sender;
                Session["Renewalid"] = int.Parse(lbRenewalID.CommandArgument);
                //ScriptManager.RegisterStartupScript(this.GetType(), "popupView", "switchPopupView('divSimplePopup');", true);
                 //divSimplePopup.Show();
                //int i = int.Parse(Session["Renewalid"].ToString());
                DataSet ds = new AddRenewalBF().SelectRenewalDtlForUpdate(int.Parse(Session["Renewalid"].ToString()));
                RbtnRenewalOptionId.SelectedValue = ds.Tables[0].Rows[0]["RenewalOptionId"].ToString();
                txtValidFrom.Text = ds.Tables[0].Rows[0]["ValidFrom"].ToString();
                txtValidTo.Text = ds.Tables[0].Rows[0]["ValidTo"].ToString();
                txtPaidAmount.Text = ds.Tables[0].Rows[0]["PaidAmount"].ToString();
                txtPaidDate.Text = ds.Tables[0].Rows[0]["PaidDate"].ToString();
          
       
        }