alert in static function webmethod

[WebMethod]
    public  static  void insertvalues(string[] valu)
    {
        try
        {
            score = int.Parse(valu[1]) + int.Parse(valu[3]) + int.Parse(valu[4]) + int.Parse(valu[5]) + int.Parse(valu[6]);
            string script ="<script type=\"text/javascript\">"+string.Format("alert('{0}');", score)+";</script>";;
          
            
            Page page = HttpContext.Current.CurrentHandler as Page;

            if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert"))
            {
                page.ClientScript.RegisterClientScriptBlock(page.GetType(), "alert", script, true);
            }


        }
        catch (Exception ex)
        {

            throw ex;
        }
     
         
    }