Gridview - add/remove rows on the fly, no database

[tucson]

I have a gridview that has a blank row with 2 input fields: file to upload, and a description of the file. They click Add and a new row is added, Remove and the row is removed.

The problem is:
When a new row is added, I loop through the existing gridview rows, store the data in a dataset, and rebind. In debug mode, I see the values I entered but when I rebind, it's not displayed in the gridview.


Here's the code aspx code:

<asp:GridView ID="gFiles" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" Visible="False">
             <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
             <Columns>
                <asp:TemplateField HeaderText="File to upload">
                     <ItemTemplate>
                         <asp:FileUpload ID="FileToUpload" runat="server" Width="400px" />
                     </ItemTemplate>
                 </asp:TemplateField>
                 <asp:TemplateField HeaderText="Description">
                     <ItemTemplate>
                         <asp:TextBox ID="tbDesc" runat="server" Height="24px"
                             MaxLength="200" TextMode="MultiLine" Width="300px"></asp:TextBox>
                     </ItemTemplate>
                 </asp:TemplateField>
                 <asp:TemplateField ShowHeader="False" HeaderText="Add">
                     <ItemTemplate>
                         <asp:LinkButton ID="btnAdd" runat="server" CausesValidation="false" CommandName="Add"
                             Text="Add"></asp:LinkButton>
                     </ItemTemplate>
                 </asp:TemplateField>
                              </Columns>
<Columns>
            <asp:CommandField ShowDeleteButton="True" DeleteText="Remove" /></Columns> 
             <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" HorizontalAlign="Left" />
             <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
         </asp:GridView>
 

Here's the code behind:

       If dtFiles.Rows.Count = 0 Then
            'crate the blank table
            dtFiles.Columns.Add("FileToUpload", GetType(FileUpload))
            dtFiles.Columns.Add("tbDesc", GetType(TextBox))
            dtFiles.Columns.Add("Add", GetType(LinkButton))
        End If
        'Convert datagrid to dtFiles
        Dim gr As GridViewRow
        Dim nr As DataRow
        For Each gr In gFiles.Rows
            nr = dtFiles.NewRow
            Dim tb As New TextBox
            tb = CType(gr.FindControl("tbDesc"), TextBox)
            nr(1) = tb
            dtFiles.Rows.Add(nr)
        Next
 
        If e.CommandName = "Add" Then
            'Add new row to dtFiles
            nr = dtFiles.NewRow
            dtFiles.Rows.Add(nr)
        ElseIf e.CommandName = "Remove" Then
            dtFiles.Rows.RemoveAt(gFiles.SelectedIndex)
            gFiles.DataSource = dtFiles
            gFiles.DataBind()
        End If
        gFiles.DataSource = dtFiles
        gFiles.DataBind()

[debasisdas]

Question moved to .net forum.