Image Button click event in gridview

protected void imgMEvlt_Click(object sender, EventArgs e)
     {
        ImageButton lbtnedit = (ImageButton)sender;
        GridViewRow row = (GridViewRow)lbtnedit.NamingContainer;
        HiddenField PROCESSTRANSID = (HiddenField)row.FindControl("hd_transprocid");
        string PROCTRANSID = PROCESSTRANSID.Value.ToString();
        String script = "fnOpen('UpdateRuningProcess.aspx?PROCID=" + PROCTRANSID+"')";
        ScriptManager.RegisterClientScriptBlock(Page, GetType(), new Guid().ToString(), script, true);
     }