I have a grid with many pages (allowpaging = true) and I want onprerender

that some items will be selected = true

I have this code :

protected void Grid_MailingList_PreRender(object sender, EventArgs e)

    {

      foreach (GridDataItem item in Grid_MailingList.Items)

                {

                 string person = SessionMng.MessagesListData.Tables[0].Rows[i++]["iPersonId"].ToString();

                    DataView dv = new DataView(SessionMng.SavedMessage.Tables[1], "iPersonId= '" + person + "'", "", DataViewRowState.CurrentRows);

                    if (dv.ToTable().Rows.Count > 0)

                        item.Selected = true;

                }

            }

        }

    }

but it work only in the first page of the grid.

how can I pass on all of the pages at the grid ?

telerik:RadGrid ID="RadGrid1" AutoGenerateEditColumn="false" runat="server"

AllowAutomaticDeletes="False" AllowAutomaticInserts="False" AllowAutomaticUpdates="False"

AllowPaging="True" AllowSorting="true" OnItemCommand="gridRequestList_ItemCommand" >

<MasterTableView EditMode="PopUp" CommandItemDisplay="Top" AutoGenerateColumns="false"

AllowAutomaticInserts="false" AllowAutomaticUpdates="false" >

<Columns>

</Columns>

<EditFormSettings InsertCaption="Setup Info" EditFormType="Template">

<FormTemplate> code here </FormTemplate>

</EditFormSettings>

</MasterTableView>

</telerik:RadGrid>

void grid_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)

{

if (e.CommandName.Equals(RadGrid.PerformInsertCommandName))

{

    string txtName = ((TextBox)e.Item.FindControl("txtName")).Text;

}

}

Thanks.
tj