Datagrid ID

I am new to .Net. I have used VB for several years, but I can't find out what I am doing wrong. I know it is something stupid.

VB Code:

Sub BindTranslationGrid(ByVal e As DataGridItemEventArgs)
  
        Dim ID As String = CType(dgSearchConfiguration.DataKeys(e.Item.ItemIndex), String)
 
         txtError.Text = ID
   
End Sub
 
HTML
 
<asp:datagrid id="dgSearchConfiguration" style="Z-INDEX: 101; LEFT: 24px; POSITION: absolute; TOP: 224px"
                runat="server" DataKeyField="Src ID" Font-Size="Smaller">
    <AlternatingItemStyle BackColor="#E0E0E0"></AlternatingItemStyle>
    <HeaderStyle Font-Bold="True" BackColor="#E0E0E0"></HeaderStyle>
                <Columns>
    <asp:ButtonColumn ButtonType="LinkButton" Text="Translations"></asp:ButtonColumn>
                </Columns>
</asp:datagrid>

What is the problem?

It is not showing the datakeyfield when I select it in the datagrid. It is like the event is not firing.