GridView分页,无法获取正确的数据键值

GRIDVIEW

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
    AllowSorting="True" PagerSettings-Position="TopAndBottom"
    PagerSettings-Mode="Numeric" PageSize="40" CellPadding="4" DataSourceID="dsEquipmentGridView"
    ForeColor="#333333" GridLines="Horizontal" Style="font-size: x-small" AutoGenerateColumns="False"
    DataKeyNames="IREF" OnRowEditing="GridView1_RowEditing" OnRowUpdated="GridView1_RowUpdated"
    OnSorted="GridView1_Sorted" OnSorting="GridView1_Sorting" OnPageIndexChanged="GridView1_PageIndexChanged1"
    OnPageIndexChanging="GridView1_PageIndexChanging" OnSelectedIndexChanged="GridView1_SelectedIndexChanged"
    OnSelectedIndexChanging="GridView1_SelectedIndexChanging" OnRowCommand="GridView1_RowCommand"
    BorderColor="Black" BorderStyle="Solid" BorderWidth="1px" 
    OnRowCancelingEdit="GridView1_RowCancelingEdit" onload="GridView1_Load" 
    ondatabound="GridView1_DataBound">
    <PagerSettings Position="TopAndBottom" />
    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
    <Columns>
 <asp:CommandField ShowDeleteButton="False" ShowSelectButton="true" EditText="QuickEdit"
     HeaderText="Manage" SelectText="Manage" />

对于加载的第一页,如果单击命令字段,它将显示正确的数据键值。

但是,如果我切换到结果的下一页,在选择一个记录时,相应的值是不正确的。它似乎保留了上一页的信息。我如何克服这个问题?

编辑:

在GridView中,我使用了以下方法:

    // Determine the index of the selected row.
    int index = GridView1.SelectedIndex;

    // Display the primary key value of the selected row.
    HttpContext.Current.Response.Write("The primary key value of the selected row is " + GridView1.DataKeys[index].Value.ToString() + ".<br>");

    GridViewRow row = GridView1.Rows[index];

    int rowindex = row.RowIndex;
    HttpContext.Current.Response.Write("rowindex-> " + rowindex.ToString() + "<br>");

    int ID = (int)GridView1.DataKeys[row.DataItemIndex - (GridView1.PageIndex * GridView1.PageSize)].Value;

    HttpContext.Current.Response.Write("row.DataItemIndex" + ID.ToString()+"<br>");

    int Userid = Convert.ToInt32(GridView1.DataKeys[index].Value);

    HttpContext.Current.Response.Write("Userid" + Userid.ToString() + "<br>");

分页后无法获得正确的值。