recording video from webcam

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VB

webcam

i want to record and save a video from the webcam..i can see the video preview but i am not able to save it.
i am new to visual basic..and i dont know how to use directshow ..so i am using the vfw api.
The code i have used is...

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim save As Integer
        save = MsgBox("Do you want to save your recording video", MsgBoxStyle.YesNo + MsgBoxStyle.Information, "Recording Video")
        If (save = MsgBoxResult.Yes) Then
            Dim saveName As New SaveFileDialog
            saveName.Filter = "Avi file(*.avi)|*.avi"
            If saveName.ShowDialog = Windows.Forms.DialogResult.OK Then
                ' SendMessage(hWnd, WM_CAP_FILE_SAVEAS, 0, "C:\RecordedVideo.avi")
                SendMessage(hWnd, WM_CAP_FILE_SAVEAS, 0, saveName.FileName)
            End If
        End If
        Me.Cursor = System.Windows.Forms.Cursors.Default
        Button2.Enabled = True
        Button3.Enabled = False
    End Sub

thanks