Capture Image Of Webbrowser Control?

I want to capture the image of my webbrowser, or actually just a part of it.I already achieved it, but it just takes a screenshot of it instead of capturing the bitmap itself. So when i use this technique and you drag another window above it, the window is also captured. (this is what I don't want.)

My code:

' 1. Get the WebBrowsers bitmap.

Dim bmp As New Bitmap(WebBrowser1.Width, WebBrowser1.Height)
Dim BMPEndResult As Bitmap
Dim graph As Graphics = Graphics.FromImage(bmp)

[code]....

So I need to get the image of the webbrowser:

- without the scrollbars if possible

- Even if the window is minimized or in the task bar

- Full webbrowser

- and also if possible just a part of it, where I can specify the top, left, width and height