Edit GridView (ASP.NET 20 / C#)

If you need to stick to that kind of layout, then I would suggest something like this example:

      <asp:GridView ID="GridView2" runat="server" Style="z-index: 103; left: 144px; position: absolute;
        top: 212px" AutoGenerateColumns="False" OnRowCancelingEdit="GridView2_RowCancelingEdit"
        OnRowEditing="GridView2_RowEditing" OnRowUpdating="GridView2_RowUpdating">
        <Columns>
          <asp:BoundField DataField="name" HeaderText="Name" />
          <asp:BoundField DataField="number" HeaderText="Number" />
          <asp:TemplateField>
            <ItemTemplate>
              <asp:LinkButton ID="linkEdit" CommandName="Edit" Text="Edit" Width="45px" runat="server"
                OnClick="EditClick" />
            </ItemTemplate>
            <EditItemTemplate>
              <asp:LinkButton ID="linkUpdate" CommandName="Update" Text="Update" Width="45px" OnClick="UpdateClick"
                runat="server" />
              <asp:LinkButton ID="linkCancel" CommandName="Cancel" Text="Cancel" Width="45px" OnClick="CancelClick"
                runat="server" />
            </EditItemTemplate>
          </asp:TemplateField>
        </Columns>
      </asp:GridView>

    protected void EditClick(object sender, EventArgs e)
    {
        LinkButton button = (LinkButton)sender;
        GridView grid = (GridView)this.FindParent(button, typeof(GridView));

        int index = GetItemIndex(button.UniqueID);
        grid.EditIndex = index;
        grid.DataBind();
    }

    protected void UpdateClick(object sender, EventArgs e)
    {
        LinkButton button = (LinkButton)sender;
    }

    protected void CancelClick(object sender, EventArgs e)
    {
        LinkButton button = (LinkButton)sender;
    }

    private int GetItemIndex(string input)
    {
        string pattern = @"ctl(?<index>\d+)";
        Match match = Regex.Match(input, pattern);

        if (match.Success)
            return int.Parse(match.Groups["index"].Value) - 2;
        return -1;
    }

    private Control FindParent(Control ctrl, Type type)
    {
        while (ctrl.GetType() != type)
            ctrl = ctrl.Parent;

        return ctrl;
    }

    protected void GridView2_RowEditing(object sender, GridViewEditEventArgs e)
    {

    }
    protected void GridView2_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView grid = (GridView)sender;
        grid.EditIndex = -1;
        grid.DataBind();
    }
    protected void GridView2_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        // Execute update SQL.
    }

Bob