Type expected datalist

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VB

datalist

i download files from gridview and i am done with that like this

Protected Sub GridView1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles GridView1.SelectedIndexChanged
    Dim strKeyName() As String = {"DocID"}
    Dim objKeyVal() As Object = {GridView1.SelectedRow.Cells(1).Text}
    Dim DocExte As String = ""
    Dim DocuName As String = ""
    structDb = objDataSet.ExecSP("tbl", "getdoc", strKeyName, objKeyVal)
    If structDb.intCode = 0 Then
        Return
    Else
        If structDb.dstResult.Tables(0).Rows.Count > 0 Then
            For i = 0 To structDb.dstResult.Tables(0).Rows.Count - 1
                Dim binary() As Byte = TryCast(structDb.dstResult.Tables(0).Rows(i).Item("document"), Byte())
                Dim ms As MemoryStream = New MemoryStream(binary)
                DocExtension = structDb.dstResult.Tables(0).Rows(i).Item("DocExte")
                DocumentName = Now.Day & Now.Month & Now.Year * Now.Hour & Now.Minute & Now.Millisecond & DocExtension
                Response.Clear()
                Response.Buffer = True
                Response.Charset = ""
                Response.Cache.SetCacheability(HttpCacheability.NoCache)
                Response.ContentType = ContentType
                Response.AppendHeader("Content-Disposition", Convert.ToString("attachment;filename=") & DocuName )
                Response.BinaryWrite(binary)
                Response.Flush()
                Response.[End]()
            Next
        End If
    End If

End Sub

now i try to download from data list but in data list how i get value i.e. documentid from data list as i get this value from gridview through cells now how i modify according to data list

data list cod

What I have tried:

<asp:DataList ID="dl_Options" runat="server" Width="100%" DataKeyField="HisIndex" BorderColor="Black" BorderStyle="Solid" Font-Bold="False" BackColor="White" BorderWidth="0px">
                                <ItemTemplate>

                                    <table class="colordtd">
                                        <tr>
                                            <td class="ProductPropertyLabel" width="100px">Customer Responce:</td>
                                            <td>
                                                <asp:Label ID="Label5" runat="server" Text='<%# Eval("GroupName") %>' /></td>
                                            <td class="ProductPropertyLabel" width="100px">Entry Date:</td>
                                            <td width="100px">
                                                <asp:Label ID="Label6" runat="server" Text='<%# Eval("EntryDate") %>' />
                                        </tr>
                                        <tr>
                                            <td class="ProductPropertyLabel" width="100px">Remarks:</td>
                                            <td width="300px">
                                                <asp:Label ID="Label8" runat="server" Text='<%# Eval("Remarks") %>' /></td>
                                            <td class="ProductPropertyLabel" width="100px">File:</td>
                                              <asp:HiddenField ID="HiddenFieldDocID"
                                                runat="server" Value='<%# Eval("DocumentID")%>' /> 
                                            <td width="100px">
                                                <asp:LinkButton ID="lnkDownload" runat="server" CausesValidation="False" 
                                        CommandArgument='<%# Eval("FileName")%>'  
                                        CommandName="Download" Text='<%# Eval("FileName")%>' />                                                                   
                                        </tr>
                                    </table>

                                </ItemTemplate>
                            </asp:DataList>

get doc sp is

select DocID,document,DocuName ,DocExte from Downloads where DocumentID = @DocumentID 

now i modify according to like for download documents

Protected Sub DownloadFile(sender As Object, e As EventArgs)
    Dim strKeyName() As String = {"DocID"}
    Dim ID As Guid = Guid.Parse(DirectCast(FindControl("HiddenFieldDocID"), HiddenField).Value)
    Dim objKeyVal() As Object = {ID}
    Dim DocExte As String = ""
    Dim DocuName As String = ""
    structDb = objDataSet.ExecSP("tbl", "getdoc", strKeyName, objKeyVal)
    If structDb.intCode = 0 Then
    Return
    Else
        Dim count As Integer = dl_Options.Items.Count
        For i As Integer = 0 To count - 1
            Dim binary() As Byte = TryCast(dl_Options.Items(i),("document"), Byte())
            Dim ms As MemoryStream = New MemoryStream(binary)
            DocExte = structDb.dstResult.Tables(0).Rows(i).Item("DocExtension")

            DocumentName = Now.Day & Now.Month & Now.Year * Now.Hour & Now.Minute & Now.Millisecond & DocExte 

            Response.Clear()
            Response.Buffer = True
            Response.Charset = ""
            Response.Cache.SetCacheability(HttpCacheability.NoCache)
            Response.ContentType = ContentType
            Response.AppendHeader("Content-Disposition", Convert.ToString("attachment;filename=") & DocuName )
            Response.BinaryWrite(binary)
            Response.Flush()
            Response.[End]()
        Next

    End If

End Sub

when i try this shows an error

Type expected.

on this line

Dim binary() As Byte = TryCast(dl_Options.Items(i),("document"), Byte())