ASP.NET DropDownList Selected Value With Enumeration - asp.net

Question

I'm using the settings in an enumeration to populate a dropdownlist in ASP.NET 4.0. The problem I'm having is that when I attempt to set a selected value other than first item, it throws an error telling me it cannot have more than one option selected.
Here's a sample of the code:
Public Shared Function ConvertEnumToArray(ByVal enumType As System.Type, _
Optional ByVal DefaultValue As String = "nodefault", _
Optional ByVal PromptValue As String = "", _
Optional ByVal PromptText As String = "") As ListItem()
Dim itemSelected As Boolean = False
Dim i As Int32 = 0
If Not enumType.IsEnum Then
Throw New Exception(String.Format("Type {0} is not an enumeration.", enumType.Name))
End If
'Dim itemValues() As Array = [Enum].GetValues(enumType)
Dim fields As FieldInfo() = enumType.GetFields()
Dim itemNames() As String = [Enum].GetNames(enumType)
Dim arr(itemNames.Length + 1) As ListItem
For Each field As FieldInfo In fields
If Not field.Name.Equals("value__") Then
Dim item As New ListItem(field.Name, field.GetRawConstantValue().ToString())
If item.Value = DefaultValue And DefaultValue <> "nodefault" Then
item.Selected = True
itemSelected = True
End If
arr(i) = item
i = i + 1
End If
Next
If PromptText <> "" Then
Dim item As New ListItem(PromptText, PromptValue)
If Not itemSelected Then
item.Selected = True
End If
arr(i) = item
End If
Return arr
End Function
Dim arrExtraChargesOptions() As ListItem
arrExtraChargesOptions = Enumerations.ConvertEnumToArray(GetType(Enumerations.MoneyRoomCourierExtraChargesOptions))
For Each li As ListItem In arrExtraChargesOptions
'since arrays double in capacity to store data, there may be nulls
If Not li Is Nothing Then
Me.drpMondayExtraCharges.Items.Add(li)
End If
Next
Me.drpMondayExtraCharges.ClearSelection()
Me.drpMondayExtraCharges.SelectedIndex = -1
Me.drpMondayExtraCharges.Items.FindByValue(Courier.MondayExtraCharge.ToString()).Selected = True
Despite clearing the selected value in multiple ways, the first item remains selected resulting in the error as mentioned above.
Other items that might help explaining how I ended up with the code above:
I'm setting the return type of the function to an array since that's the parameter type the AddRange function on the DropdownList.Items expects, but when I used that method, an exception resulted due to the NULLs in the array.
Before adding the ClearSelection() and SelectedIndex = -1 lines, my setting the selected value (either through the FindByValue as above or just directly setting the SelectedValue) resulted in my desired selected value being ignored.
Any thoughts? Thanks.
EDIT: I misspoke above (bad memory): Setting the SelectedValue directly results is what results in it being ignored. It has nothing to do with ClearSelection Or SelectedIndex =1 as I stated in the second bullet up above.

Answer 1

I found this issue (and I didn't provide enough code for you to find it yourselves).
Basically, I had a dropdownlist for each day of the week and the list items returned by ConvertEnumToArray above were added to each of the dropdowns. As a result, the selected item was changed on all the dropdown since the same list items were on each dropdown. Adding them to the dropdown as New Listitems solved the problem.