当DataGrid同时具有分页和排序功能时应注意在重新绑定数据源时，MyDataGrid.CurrentPageIndex=0; 下面给实现以上功能的原码，也就不多缀了aspx中包含有DataGrid和控制其数据源变化的dropdownlist

  DataGrid代码
   <asp:datagrid id="MyDataGrid" runat="server" BorderColor="#CCCCCC" Font-Size="100%" HorizontalAlign="Center"
   AutoGenerateColumns="False" OnDeleteCommand="MyDataGrid_Delete" OnSortCommand="Sort_Grid" OnPageIndexChanged="MyDataGrid_PageIndexChanged"
   DataKeyField="ACC_NO" PagerStyle-Position="Bottom" PagerStyle-HorizontalAlign="Center" PagerStyle-Mode="NextPrev"
   PageSize="10" AllowSorting="True" AllowPaging="True" CellPadding="4" Width="100%">
   <AlternatingItemStyle BackColor="#E9E9E6"></AlternatingItemStyle>
   <HeaderStyle Font-Bold="True" Wrap="False" ForeColor="White" BackColor="#999999"></HeaderStyle>
   <Columns>
   <asp:ButtonColumn Text="口" CommandName="Delete"></asp:ButtonColumn>
   <asp:BoundColumn DataField="NO" SortExpression="NO" ReadOnly="True" HeaderText="序号"></asp:BoundColumn>
   <asp:BoundColumn DataField="ID" SortExpression="ID" HeaderText="ID"></asp:BoundColumn>
   <asp:BoundColumn DataField="NAME" SortExpression="NAME" HeaderText="名称"></asp:BoundColumn>
   <asp:BoundColumn DataField="C_NAME" SortExpression="C_NAME" HeaderText="各科名称"></asp:BoundColumn>
   <asp:BoundColumn DataField="FLG" SortExpression="FLG" HeaderText="项目"></asp:BoundColumn>
   </Columns>
   <PagerStyle NextPageText="下10件" PrevPageText="返回" HorizontalAlign="Center"></PagerStyle>
   </asp:datagrid>
  
  
  dropdownlist代码
  <asp:dropdownlist id="ddlWk" Runat="server" AutoPostBack="True" Enabled="False">
   <asp:ListItem Value="0">东京</asp:ListItem>
   <asp:ListItem Value="3">九州</asp:ListItem>
   <asp:ListItem Value="8">北海道</asp:ListItem>
   <asp:ListItem Value="9">四国</asp:ListItem>
   </asp:dropdownlist>
  
  
  
  aspx.cs文件代码核心如下：
  private void Page_Load(object sender, System.EventArgs e)
   {
   if(!IsPostBack)
   {
   Session["WP"] ="0";
   ddlWk_getS();
   BindGrid();
   }
   }
   private void ddlWk_getS()
   {
   switch (Session["WP"].ToString())
   {
   case "0":ddlWk.SelectedIndex=0;
   break;
   case "3":ddlWk.SelectedIndex=1;
   break;
   case "8":ddlWk.SelectedIndex=2;
   break;
   case "9":ddlWk.SelectedIndex=3;
   break;
   default:ddlWk.SelectedIndex=0;
   break;
   }
   }
   protected void BindGrid()
   {
   MyDataGrid.DataSource=GetData().Tables["vCO"].DefaultView;
   MyDataGrid.DataBind();
   //COUNT.Text=MyDataGrid.Columns.Count.ToString();
   }
  
   /// <summary>
   /// 返回Data
   /// </summary>
   ///<returns></returns>
   private DataSet GetData()
   {
   string strConn=(String) ((NameValueCollection) Context.GetConfig("system.web/database"))["strConn"];
   using (SqlConnection conn = new SqlConnection(strConn))
   {
   SqlCommand cmd = new SqlCommand("sp_C",conn);
   cmd.CommandType=CommandType.StoredProcedure;
   cmd.Parameters.Add("@place",SqlDbType.VarChar,2);
   cmd.Parameters["@place"].Value=Session["WP"].ToString();
   conn.Open();
  
   SqlDataAdapter da = new SqlDataAdapter();
   da.SelectCommand=cmd;
   DataSet ds=new DataSet();
   da.Fill(ds,"vCO");
   Count.Text="ヒット："+ds.Tables["vCO"].Rows.Count.ToString()+"件";
   return ds;
   }
  
   }
   /// <summary>
   ///从DataSet中除一
   /// </summary>
   /// <param name="sender"></param>
   /// <param name="E"></param>
   protected void MyDataGrid_Delete(Object sender, DataGridCommandEventArgs E)
   {
   String strID=MyDataGrid.DataKeys[(int)E.Item.ItemIndex].ToString();
   //删除操作
   }
   /// <summary>
   /// 分页操作
   /// </summary>
   /// <param name="sender"></param>
   /// <param name="e"></param>
   protected void MyDataGrid_PageIndexChanged(object source, DataGridPageChangedEventArgs e)
   {
   MyDataGrid.CurrentPageIndex=e.NewPageIndex;
   BindGrid();
   }
   /// <summary>
   /// 排序
   /// </summary>
   /// <param name="sender"></param>
   /// <param name="e"></param>
   protected void Sort_Grid(object sender, DataGridSortCommandEventArgs e)
   {
   DataView dv= new DataView(GetData().Tables["vCO"]);
   dv.Sort= e.SortExpression.ToString();
   MyDataGrid.DataSource=dv;
   MyDataGrid.DataBind();
   }
  
   #region Web override protected void OnInit(EventArgs e)
   {
   // //
   InitializeComponent();
   base.OnInit(e);
   }
  
   /// <summary> /// </summary>
   private void InitializeComponent()
   {
   this.ddlWk.SelectedIndexChanged += new System.EventHandler(this.ddlWk_SelectedIndexChanged);
   this.Load += new System.EventHandler(this.Page_Load);
  
   }
   #endregion
  
   private void ddlWk_SelectedIndexChanged(object sender, System.EventArgs e)
   {
   Session["WP"]=ddlWk.SelectedValue;
   MyDataGrid.CurrentPageIndex=0;//没有这一句，当该页码超出其他数据源的范围时会出错
   BindGrid();
   Response.Write( "<script language='javascript'>parent.menuframe.location.reload();</script>");
  
   } 
  

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