<ASP:DataGrid  
id="MyDataGrid" 
runat="server" 
AutoGenerateColumns="False"
OnItemCommand="OperazioniRecord" 
>
<Columns>
  <asp:BoundColumn HeaderText="Nome" DataField="Nome"/>

  <asp:TemplateColumn HeaderText="ID Categoria Utente">
  <ItemTemplate>
    <asp:TextBox 
    id="IDCatUtente"
     runat="server" 
    MaxLength="1" 
    Text='<%# DataBinder.Eval(Container.DataItem, "IDCatUtente") %>'>
    </asp:TextBox>
  </ItemTemplate>
  </asp:TemplateColumn>
                     <asp:ButtonColumn 
                          HeaderText="Modifica Record" 
                          ButtonType="PushButton" 
                          Text="Salva Modifiche" 
                          CommandName="ModificaRecord"/>
 </Columns>
 </ASP:DataGrid