DataGrid 不会显示下一页的数据

Question

无论我单击哪个页面，我的 DataGrid 都会显示来自第一页的数据，我已经搜索了解决方案，但没有任何效果。我已经把BindGrid对!IsPostBack和重新绑定在网格grid1_PageIndexChanging。这是我的代码：

protected void Page_Load(object sender, EventArgs e)

{

    if (!IsPostBack)

    {

        BindGrid();

    }

}

private int GetNumItems()

{

    SqlConnection con = new SqlConnection();

    con.ConnectionString = gc.GetWebConfigConnectionStringAIS();

    con.Open();

    string query = "SELECT COUNT(*) FROM dbo.TestingLatihan";

    SqlCommand cmd = new SqlCommand(query, con);

    Int32 totalRow = (Int32)cmd.ExecuteScalar();

    con.Close();

    return totalRow;

}

protected void grid1_PageIndexChanging(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)

{

    grid1.CurrentPageIndex = e.NewPageIndex;

    BindGrid();

}

private void BindGrid() 

{

    grid1.VirtualItemCount = GetNumItems();

    grid1.PageIndexChanged += new DataGridPageChangedEventHandler(grid1_PageIndexChanging);

    SqlConnection con = new SqlConnection();

    con.ConnectionString = gc.GetWebConfigConnectionStringAIS();

    con.Open();

    string query = "SELECT * FROM dbo.TestingLatihan";

    SqlCommand cmd = new SqlCommand(query, con);

    SqlDataAdapter myAdapter = new SqlDataAdapter(cmd);

    DataTable dt = new DataTable();

    myAdapter.Fill(dt);

    grid1.DataSource = dt;

    grid1.DataBind();

    con.Close();  

}

和我的 .aspx

<asp:DataGrid ID="grid1" runat="server" AutoGenerateColumns="False"

CellPadding="4" ForeColor="#333333" Width="100%" 

OnItemCommand="dtgItemCommand" AllowPaging="True" PageSize="5" 

AllowCustomPaging="True" OnPageIndexChanged="grid1_PageIndexChanging" 

EnableViewState="true">

   <AlternatingItemStyle CssClass="tdgenap" />

   <ItemStyle CssClass="tdganjil" HorizontalAlign="Center" />

      <HeaderStyle HorizontalAlign="Center" Height="30px" CssClass="tdjudul"></HeaderStyle>

          <Columns>