ADO.NET :: Insert Userid As System.Guid To The Uniqueidentifier Field?

I'm trying to insert userid that is a System.Guid into an additional table into the same userid field that is uniqueidentifier. It seems as it cannot insert the System.Guid type there wether I'm passing it directly as the System.Guid or as a String then converting.

<System.ComponentModel.DataObjectMethodAttribute _
(System.ComponentModel.DataObjectMethodType.Insert, True)> _
Public Function InsertUserInterests( _
ByVal strUserId As String, ByVal strCode As String) _
As Boolean
Dim userInter As New DS1.tblUserInterestsDataTable
Dim userInterRow As DS1.tblUserInterestsRow = userInter.NewtblUserInterestsRow
Dim ug As System.Guid = New Guid(strUserId)
userInterRow.UserId = ug ' This didn't go through I beleive
userInterRow.InterestCode = strCode
userInter.AddtblUserInterestsRow(userInterRow)
Dim rowsAffected As Integer = Adapter.Update(userInter)
Return rowsAffected = 1
End Function