vb.net图片加图片水印

'下面加水印 w^4TGv=X  
Dim copyimage As Image = Image.FromFile(TextBox4.Text) 6qNH'fd)`  
Dim oimage As Image = System.Drawing.Image.FromFile(value(inti)) yP]ns+
 
Dim g As Graphics = Graphics.FromImage(oimage) S;{d?~\  
g.DrawImage(copyimage, New Rectangle((oimage.Width - copyimage.Width) / 2, (oimage.Height - copyimage.Height) / 2, copyimage.Width, copyimage.Height), 0, 0, copyimage.Width, copyimage.Height, GraphicsUnit.Pixel) 1f{Wlg7?:  
g.Dispose() PgU&"}}  
oimage.Save(TextBox3.Text + "\" + imageid + ".jpg") e oCH(  
oimage.Dispose