C#后台调用前台js方法

前台js方法（写在head标签之内）

<script type="text/javascript" language="javascript">              function Close()                                 {                  document.getElementById("doing").style.display = "none";                  document.getElementById("divLogin").style.display = "none";              }  </script>

后台方法。我选用的是一个LinkButton

protected void LinkButton2_Click(object sender, EventArgs e)     {         int count = 0;         for (int i = 0; i <= GridView1.Rows.Count - 1; i++)         {             CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("cbSelect");                if (cbox.Checked == true)             {                 count++;             }                       }         if (count == 0)         {             ScriptManager.RegisterStartupScript(this.UpdatePanel2, this.UpdatePanel2.GetType(), "Alert", "alert('请至少选择一个物资！')", true);             return;         }         else       {          //调用前台的 Close() 方法             ClientScriptManager cs = Page.ClientScript;             cs.RegisterStartupScript(this.GetType(), "", "<script type="text/javascript">Close() ;</script>");               }