[RESOLVED] Trying to Serialize a class

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I'm trying to serialize this class:

<System.Serializable()> Public Class Person 
    Private _FirstName As String 
    Public Property FirstName() As String 
        Get 
            Return _FirstName 
        End Get 
        Set(ByVal value As String) 
            _FirstName = value 
        End Set 
    End Property 
    Private _LastName As String 
    Public Property LastName() As String 
        Get 
            Return _LastName 
        End Get 
        Set(ByVal value As String) 
            _LastName = value 
        End Set 
    End Property 
End Class

Using this Class' .Serialize method:

Public Class Serialization 
    Public Function Serialize(ByVal FilePath As String, ByVal MyType As System.Type) As Boolean 
        Try 
            Using sw As New System.IO.StreamWriter(FilePath) 
                Dim ser As New Xml.Serialization.XmlSerializer(MyType) 
                ser.Serialize(sw, MyType) 
            End Using 
            Return True 
        Catch ex As Exception 
            Return False 
        End Try 
    End Function 
End Class

Calling it like this:

Public Class Form1 
    Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
        Dim ser As New Serialization 
        Dim p As New Person With {.FirstName = "MyFirstName", .LastName = "MyLastName"} 
        ser.Serialize("C:\test\person.xml", p.GetType) 
    End Sub 
End Class

But I get a "InvalidOperationException: There was an error generating the XML document" exception. I can't understand why the above does not work but if I change the .Serialize function to:

Public Class Serialization 
    Public Function Serialize(ByVal FilePath As String, ByVal MyType As Person) As Boolean 
        Try 
            Using sw As New System.IO.StreamWriter(FilePath) 
                Dim ser As New Xml.Serialization.XmlSerializer(MyType.GetType) 
                ser.Serialize(sw, MyType) 
            End Using 
            Return True 
        Catch ex As Exception 
            Return False 
        End Try 
    End Function 
End Class

It works...