DataGrid功能强大，我们只用写几行代码就能够实现复杂的页面数据显示。数据多的时候免不了要分页显示，DataGrdi本身自带分页功能，但是当数据量少的时候很方便，当大数据量时，DataGrid得分页机制就不太好了。于是在网上找到了一种比较好的利用存储过程实现分页机制(客户端想要第几页就取第几页数据，上十万级的数据查询也很快，数据量再多的时候就没试过了，等有时间把利用存储过程分页也写在blog上)在工作中为了让客户用的更舒服点，也赶时髦，想利用Ajax来实现DataGrid无刷新分页。主要用RenderControl方法把DataGrid翻译成Html代码，然后用Web Service 返回。当然也可以用别的方法。

GenericAjaxWS.asmx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Diagnostics;
using System.Web;
using System.Web.Services;
using System.Configuration;
using System.Web.UI.WebControls;
using System.Web.UI;
using System.IO;

namespace GenricAjaxWS
{
      [WebService(Namespace="http://localhost/GenricAjaxWS/")]
      public class GenricAjaxWS : System.Web.Services.WebService
      {
            SqlConnection con;
            SqlDataAdapter da;
            SqlCommand cmd;
            DataSet ds;

            public GenricAjaxWS()
            {
              InitializeComponent();
              con= new SqlConnection(ConfigurationSettings.AppSettings["Connect"]);
              da=new SqlDataAdapter("",con);
              cmd=new SqlCommand("",con);
              ds=new DataSet("TahaSchema");
            }

            #region Component Designer generated code

            //Required by the Web Services Designer
            private IContainer components = null;

            /// <summary>
            /// Required method for Designer support - do not modify
            /// the contents of this method with the code editor.
            /// </summary>
            private void InitializeComponent()
            {
            }

            /// <summary>
            /// Clean up any resources being used.
            /// </summary>
            protected override void Dispose( bool disposing )
            {
              if(disposing && components != null)
              {
                    components.Dispose();
              }
              base.Dispose(disposing);
            }
           
            #endregion
 
/// <summary>
/// this function accepts TSql statment and returns dataset
/// </summary>
 

            [WebMethod]
            public string getGrid(string sqlStr,int pageIndex)
            {
              da.SelectCommand.CommandText=sqlStr;
              da=new SqlDataAdapter(sqlStr,con);
              da.Fill(ds,"myTable");

              DataGrid dataGrid = new DataGrid();
              dataGrid.AutoGenerateColumns = true;
              dataGrid.DataSource = ds.Tables["myTable"].DefaultView;
              dataGrid.AllowPaging = true;
              dataGrid.PageSize = 4;
              dataGrid.PagerStyle.Visible = false;
              dataGrid.CurrentPageIndex = pageIndex;
              try
              {
                    dataGrid.DataBind();
              }
              catch(Exception)
              {

              }
              StringWriter wr = new StringWriter();
              HtmlTextWriter writer = new HtmlTextWriter(wr);
              dataGrid.RenderControl(writer);
              string gridHtml = wr.ToString();
              wr.Close();
              writer.Close();
              DropDownList ddl_Pager = new DropDownList();
              ddl_Pager.Attributes.Add("onchange","goToPage(this.value)");
              string pager="";
              for(int i=0;i<dataGrid.PageCount;i++)
              {
                ListItem lItem = new ListItem(i.ToString(),i.ToString());
                ddl_Pager.Items.Add(lItem);
                if(i==pageIndex)
                {
                  pager += "[background-color:#ffdd11;width" +
                         ":20px;align:center\"><a href=\"#\" onclick" +
                         "=\"goToPage("+i+")\">"+i+"</a>]";
                }
                else
                {
                  pager += "[width:20px;align:center\">" +
                         "<a href=\"#\" onclick=\"goToPage" +
                         "("+i+")\" >"+i+"</a>]";
                }
              }
              ddl_Pager.SelectedIndex = pageIndex;
              wr = new StringWriter();
              writer = new HtmlTextWriter(wr);
              ddl_Pager.RenderControl(writer);
              string pagerHtml = "<input type=button" +
                                 " value=< onclick=goToPrevPage()>";
              pagerHtml += wr.ToString();
              pagerHtml += "<input type=button value=>" +
                           " onclick=this.disabled=goToNextPage()>";
              wr.Close();
              writer.Close();
              return pager+pagerHtml+"<br>"+gridHtml;
            }
      }
}