部门_员工无刷新效果

最简单的方法，在页面上拖个updatepanel，然后把你要实现无刷新的控件拖到里面。

你看下下面的例子，好好学学：
HTML代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>无标题页</title>
    <script type="text/javascript" language="javascript">
   var XmlHttp;
   function createXMLHttpRequest()
   {

  try{
  XmlHttp=new ActiveXObject("Msxml2.XMLHTTP");}
  catch(e)
  {

  try{
  XmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }

  catch(oc)
  {
  XmlHttp=null;
  }
  }
  if(!XmlHttp && typeof XMLHttpRequest !="undefined")
  {

  XmlHttp=new XMLHttpRequest();
  }
  return XmlHttp;

  }





    function handle()
    {

    if(XmlHttp.readyState==4){           if(XmlHttp.status==200)
    {

    var citystring=XmlHttp.responseText;
    var cityarray=citystring.split(",");
    while(document.getElementById("city").options.length>0)
    {
   document.getElementById("city").options.remove(0);
    }
    for(var j=0;j<cityarray.length;j++)
    {
    var ooption=document.createElement("OPTION");
    ooption.text=cityarray[j];
    ooption.value=cityarray[j];
    document.getElementById("city").add(ooption);

    }
    }


    else{


    alert("页面请求异常");

    }
    }
    }
    function request(str)
    {

    var url="~/getbook.aspx?bk="+escape(str);
alert(url);
    createXMLHttpRequest();
    XmlHttp.onreadystatechange=handle;
    XmlHttp.open("GET",url,true);
    XmlHttp.send(null);



    }



    </script>
</head>
<body>
<select id="pro" onchange="request(this.value)"><option value="0">选择类型</option>
<option value="hn">河南省</option>
<option value="gd">广东省</option></select>
<br />
<select id="city"></select>
</body>
</html>
getbook.aspx.CS代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class getbook : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string bk, result = "";
        bk = Request.QueryString["bk"].ToString().Trim();
        if (bk != "")
        {
            switch (bk)
            {
                case "hn":
                    result = "郑州,洛阳,开封";
                    break;                case "gd":
                    result = "广州,深圳,珠海";
                    break;            }
            Response.Write(result);        }    }
}getbook.aspx代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="getbook.aspx.cs" Inherits="getbook" %>

肯定是要 ajax 的效果了可以vs自带的也可以用别的

JQuery zTree 行政区划异步加载树形目录
Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="zTree._Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>JQuery zTree行政区划</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
    <script src="js/jquery.ztree-2.6.min.js" type="text/javascript"></script>    <script type="text/javascript">
        var zTree;
        var setting = {
            async: true,
            asyncUrl: "getSubtree.ashx",
            asyncParam: ["id"],
            isSimpleData: true,
            treeNodeKey: "id",
            treeNodeParentKey: "pId",
            showLine: true
        };
        $(document).ready(function(){
            setting.expandSpeed = "fast";
            zTree = $("#tree").zTree(setting, null);
        });
    </script>
</head>
<body>
    <ul id="tree" class="tree" style="width:300px; overflow:auto;"></ul>
</body>
</html>getSubTree.ashx
using System;
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using System.Threading;namespace zTree
{
    ///
    /// $codebehindclassname$ 的摘要说明
    ///
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class getSubtree : IHttpHandler
    {        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            string id = context.Request.Form["id"];
            dbOperator dbopt = new dbOperator();
            if (string.IsNullOrEmpty(id)) id = "0";
            string s = dbopt.getIdData(dbopt.getDataTableById(id));
            context.Response.Write(s);
        }        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}dbOperator.cs
using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.OleDb;
using System.Text;namespace zTree
{
    public class dbOperator
    {
        static string cs = ConfigurationManager.ConnectionStrings["ualscxaxConnectionString"].ConnectionString;        public DataTable getDataTableById(string id)
        {
            OleDbDataAdapter da = new OleDbDataAdapter("SELECT t.*, (SELECT COUNT(1) FROM area WHERE pid = t.id) AS sub FROM area AS t WHERE pid = @id", cs);
            da.SelectCommand.Parameters.AddWithValue("@id", id);
            DataTable dt = new DataTable();
            da.Fill(dt);
            da.Dispose();
            return dt;
        }        public string getIdData(DataTable dt)
        {
            StringBuilder sb = new StringBuilder();
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; ++i)
                {
                    int id = (int)dt.Rows[i]["id"];
                    int pid = (int)dt.Rows[i]["pid"];
                    string name = dt.Rows[i]["item"].ToString();
                    string sub = ((int)dt.Rows[i]["sub"] > 0).ToString().ToLower();
                    string s = string.Format("{{id:{0},pId:{1},name:'{2}',isParent:{3}}},", id, pid, name,sub);
                    sb.Append(s);
                }
                --sb.Length;
            }
            return "[" + sb.ToString() + "]";
        }
    }
}

iframe可以实现<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Wage_Main.aspx.cs" Inherits="Wage_Main" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<frameset rows="100,*" cols="*" framespacing="0" frameborder=10 border="0" bordercolor="#FF0000">
    <frame src="Wage_Main_Top.aspx" name="left" scrolling="no" >
    <frame name="main" scrolling="No" src="Wage_Welcome.aspx" >
    <noframes>
        <body>
            <p>
                看不到？</p>
        </body>
    </noframes>
</frameset>
</html>
iframe
菜单

用VS的updatepanel控件就好了就像3楼说的那样

  托用AJAX控件
    两个；ScriptManager  ；UpdatePanel
  ScriptManager拖到页面最上方就行了
     <UpdatePanel>
   里面是你的部门员工
</UpdatePanel>
   就这样就行了。

AJAX控件，最简单，也很实用，不会AJAX的话，这也是个不错的选择

调试易

部门_员工无刷新效果

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部门_员工 无刷新效果

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部门_员工无刷新效果