DropDownList.DataBind() in ItemTemplate

[rema43001]

Hello, this is my code for bind a dropdowlist in ItemTemplate that has a Bind("field")

it's work fine, but in Edit Mode one time in     
list.DataSource = dsDropDown
give the error:

    {"Object reference not set to an instance of an object."}
    
Then in I'm using a catch for this error, and all is fine.

Do you know a solution for don't use the catch?

  Protected Sub RadGrid1_ItemCreated(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles RadGrid1.ItemCreated

    If (TypeOf e.Item Is GridDataItem AndAlso e.Item.IsDataBound) Then

      Try
        Dim dsDropDown As New DataSet()
        OleDbCnn = New Data.OleDb.OleDbConnection(Session("CONNECT_DBS"))
        Dim item As GridDataItem = e.Item
        Dim list As DropDownList = item.FindControl("DDL_AREA_GEOGRAFICA_NAME")
        OleDbSql = Area_Geografica_Code()
        Dim OleDbDad As New Data.OleDb.OleDbDataAdapter
        OleDbDad = New Data.OleDb.OleDbDataAdapter(OleDbSql, OleDbCnn)
        OleDbDad.Fill(dsDropDown)
        list.DataSource = dsDropDown
        list.DataTextField = "NAME"
        list.DataValueField = "CD_CODE"
      Catch ex As Exception
        ex.Message.ToString()
      End Try

    End If 

  End Sub

Thanks for any help