Datagrid点击编辑的时候如何只出现一个TextBox?



前台代码

<asp:datagrid id="dgVidicon" runat="server"  AllowPaging="False"  AutoGenerateColumns="False" OnUpdateCommand="update" OnCancelCommand="cancel" OnEditcommand="edit">

<Columns>						

<asp:BoundColumn Visible="False" DataField="Id">			</asp:BoundColumn>

<asp:BoundColumn DataField="A" HeaderText="AA">

        </asp:BoundColumn>

<asp:BoundColumn DataField="B" HeaderText="BB">

        </asp:BoundColumn>

<asp:BoundColumn DataField="C" HeaderText="CC">

        </asp:BoundColumn>

<asp:BoundColumn DataField="ABC" HeaderText="ABC">

        </asp:BoundColumn>

<asp:EditCommandColumn CancelText="取消" EditText="编辑" UpdateText="更新"></asp:EditCommandColumn>

</Columns>

</asp:datagrid>

后台代码

public void edit(object sender, DataGridCommandEventArgs e)

        {

            dgVidicon.EditItemIndex = Convert.ToInt32(e.Item.ItemIndex);

            DataFiller(0);

        }

        public void cancel(object sender, DataGridCommandEventArgs e)

        {

            dgVidicon.EditItemIndex = -1;

            DataFiller(0);

        }



        public void update(object sender, DataGridCommandEventArgs e)

        {

            string strId = e.Item.Cells[0].Text;

            TextBox bbox = (TextBox)e.Item.Cells[4].Controls[0];

         }

在点击Datagrid中的 编辑 按钮的时候,我只想让数据列ABC出现可编辑的TextBox输入框,请问这个代码应该如何改写?