How to Bind a data member to Drop DownList when Using RadGrid control?

I have a RadGrid control and I'm defining the Edit Form for it.

I have added a text box to bind data to as below which works fine:

<asp:TextBox ID="tbAuthenticationMode" runat="server" Text='<%# Bind("AuthenticationMode") %>' CssClass="tbAuthenticationMode">
                                    </asp:开发者_运维问答TextBox>

Now, I'd like to remove this text box and replace it with a simple drop down list as below:

 <asp:DropDownList ID="ddlAuthenticationMode" runat="server">
                                    <asp:ListItem Text="Windows Authentication" Value="Windows"></asp:ListItem>
                                    <asp:ListItem Text="SQL Server Authentication" Value="SqlServer"></asp:ListItem>
                                    </asp:DropDownList>

What I'd like to happen is that the "AuthenticatioMode" value to be bound to this drop down list.

How would it be possible?

Thanks

---

You must first override the RadGrid's ItemCreated event. Then check if the event's item editable and en edit mode. Then you can bind data to it. Here's a code sample:

protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e)
{
   if (e.Item is GridEditableItem && e.Item.IsInEditMode)
   {
      GridEditFormItem geiEditedItem = e.Item as GridEditFormItem;
      geiEditedItem.Visible = true;

      //Edit mode
      if (e.Item.DataItem is YourClass)
      {
         YourClass currentItem = (YourClass)e.Item.DataItem;

         DropDownList ddlAuthenticationMode= geiEditedItem.FindControl("ddlAuthenticationMode") as DropDownList;
         ddlAuthenticationMode.SelectedValue = currentItem.AuthenticatioMode.ToString();
      }
   }
}