Merge two pictures in VB.NET

I have three pictureboxes. How to combine two pictures from two pictureboxes to third that first picture is behind the second?
I need to save the third (combined) picture in database... (i know how to do this)

Thank you in advance.
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This code will overlay 1 bmp over another
Bitmap Circle = (Bitmap)Image.FromFile(@"c:\circle.bmp");
     Bitmap MergedBMP = (Bitmap)Image.FromFile(@"c:\cross.bmp");
     Graphics g = Graphics.FromImage(Circle);

     pictureBox1.Image = Circle;

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djcybexAuthor Commented:
Thank you!

can you please suggest how to center the front picture to the one in the back?

i know you can set cordinates in

but pictures are diferent sizes...
and also DrawImage makes picture smaller than original..why is that?
Try either to resize image

Private Sub ResizeImage()
     Dim filename As String = "C:\windows\web\wallpaper\wind.jpg"
     Dim photo As System.Drawing.Bitmap = New System.Drawing.Bitmap(filename)
     'Resize to medium
     Dim w As Integer = 200
     Dim h As Integer = 200
     Dim medium As New System.Drawing.Bitmap(w, h)
     Dim mG As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(medium)
     mG.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed
     mG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bicubic
     mG.DrawImage(photo, 0, 0, w, h)
     medium.Save(filename, System.Drawing.Imaging.ImageFormat.Jpeg)
End Sub

or stretch it to the picbox size
 picImage.SizeMode = PictureBoxSizeMode.StretchImage
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