function Getsort(obj)
    { 
       // document.all.sortfield.value=obj;
       document.getElementById("sortfield").value=obj;
       
        if(document.getElementById("sortstring").value=='ASC')
         {
               document.getElementById("sortstring").value='DESC';
         }
         else if(document.getElementById("sortstring").value=='DESC')
         {
               document.getElementById("sortstring").value='ASC';
         }
        __doPostBack('LinkButton1',''); 
    }

后台代码：
  public DataSet GetSoftTj(AspNetPager AspNetPager1, string condition)
    {
        SqlConnection conn = db.CreateConnection();
        string sql = @"select a.Title,COUNT(a.Title) as shu from Product a,ProductComputer b,
                           Computer c where a.Product_Idn=b.Product_Idn and b.Computer_Idn=c.Computer_Idn and a.title like N'%"+condition +"%' group by Title";

        SqlDataAdapter da = new SqlDataAdapter(sql,conn);
        DataSet ds = new DataSet();
        try
        {
            da.Fill(ds,AspNetPager1.PageSize * (AspNetPager1.CurrentPageIndex - 1), AspNetPager1.PageSize, "table2");
        }
        catch (SqlException ex)
        {
            throw new Exception(ex.Message, ex);
        }
        return ds;

    }

 private void Bind(string str)
    {
        if (Request.Cookies["text1"] != null)
        {
            DataSet ds = bl.GetSoftTj(AspNetPager1,Request.Cookies["text1"].Value.ToString());
            DataView dv = ds.Tables[0].DefaultView;
            dv.Sort = str;
            Repeater1.DataSource = dv;
            Repeater1.DataBind();
        }
        else
        {

        }
    }

 private void BindAspNetPager()
    {
        if (Request.Cookies["text1"] != null)
        {
            AspNetPager1.RecordCount = bl.SoftCountTj(Request.Cookies["text1"].Value.ToString());
        }
        else
        {

        }
    }

    protected void AspNetPager1_PageChanging(object src, Wuqi.Webdiyer.PageChangingEventArgs e)
    {
        AspNetPager1.CurrentPageIndex = e.NewPageIndex;
        Bind("");
    }

protected void LinkButton1_Click(object sender, EventArgs e)
   {
       string sortfield1 = sortfield.Value;
       string sortstring1 = sortstring.Value;
       string a = sortfield1 + " " + sortstring1;

       if (a != "" && a != null)
       {
           Bind(a);
       }
   }