Visual Basic.net help

Hello everyone, I am trying to write a program that changes the desktop wallpaper when the user makes a selection, the problem with my program is that when the user presses the change wallpaper button, the the desktop changes to blue and it doesnt load the specified wallpaper. here is the basic source of it Public Class Form1 Inherits System.Windows.Forms.Form #Region " Windows Form Designer generated code " Public Sub New() MyBase.New() ''This call is required by the Windows Form Designer. InitializeComponent() ''Add any initialization after the InitializeComponent() call End Sub ''Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub ''Required by the Windows Form Designer Private components As System.ComponentModel.IContainer ''NOTE: The following procedure is required by the Windows Form Designer ''It can be modified using the Windows Form Designer. ''Do not modify it using the code editor. Friend WithEvents Button1 As System.Windows.Forms.Button Friend WithEvents Button2 As System.Windows.Forms.Button Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog Private Sub InitializeComponent() Me.Button1 = New System.Windows.Forms.Button() Me.Button2 = New System.Windows.Forms.Button() Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog() Me.SuspendLayout() '' ''Button1 '' Me.Button1.Location = New System.Drawing.Point(168, 16) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(112, 23) Me.Button1.TabIndex = 0 Me.Button1.Text = "Remove Wallpaper" '' ''Button2 '' Me.Button2.Location = New System.Drawing.Point(168, 48) Me.Button2.Name = "Button2" Me.Button2.Size = New System.Drawing.Size(112, 23) Me.Button2.TabIndex = 1 Me.Button2.Text = "Change Wallpaper" '' ''OpenFileDialog1 '' Me.OpenFileDialog1.DefaultExt = "jpg" Me.OpenFileDialog1.Filter = "JPEGS|*.jpg|Bitmap Files|*.bmp" Me.OpenFileDialog1.InitialDirectory = "e:\wallpaper" '' ''Form1 '' Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 302) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button2, Me.Button1}) Me.Name = "Form1" Me.Text = "WallPaper Changer" Me.ResumeLayout(False) End Sub #End Region Const SPIF_UPDATEINIFILE = &H1 Const SPI_SETDESKWALLPAPER = 20 Const SPIF_SENDWININICHANGE = &H2 Dim filename As String Dim x As Long Declare Function SystemParametersInfo Lib "user32" Alias _ "SystemParametersInfoA" (ByVal uAction As Integer, ByVal uparam As Integer, ByVal lpvParam As String, ByVal fuWinIni As Integer) As Integer Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click filename = "(none)" x = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0&, filename, SPIF_UPDATEINIFILE) End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click OpenFileDialog1.ShowDialog() End Sub Private Sub OpenFileDialog1_FileOk(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles OpenFileDialog1.FileOk filename = OpenFileDialog1.FileName x = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, SPIF_SENDWININICHANGE Or SPIF_UPDATEINIFILE) End Sub End Class