can't remove listitem from ddl in loop

[mharness]

Hello,

Any ideas why this code will not remove listitems for the dropdownlist?

Protected Sub CullProjects()
Dim ProjectName As String
If Me.gvRequestProjects.Rows.Count > 0 Then
For Each row As GridViewRow In Me.gvRequestProjects.Rows
ProjectName =
Trim(Me.gvRequestProjects.DataKeys(row.RowIndex).Values(1).ToString)
Me.ddlProjects.Items.Remove(ProjectName)
Next
End If
End Sub

ProjectName is a valid name of an item in the ddl. Using something very
similar to this on a one-by-one basis and it works correctly but not in this
code.

Thanks,

Mike