While I was in the middle of making a paint drawing program I had found out a very easy way to take a screenshot and display it in a picturebox or form!

Here is the code below:

Backs up your clipboard because the image will be put there.
Code:
Dim BackUpClipboard As String = My.Computer.Clipboard.GetText
This will automatically press the key that you have chosen. In our case it would be the Print Screen key. This will capture the picture.
Code:
SendKeys.Send("{PRTSC}")
PUT IMAGE INTO PICTUREBOX:

What this is doing is setting your picturebox image with the captured image which is located in your clipboard which is why we had to back it up.
Code:
PictureBox1.Image = My.Computer.Clipboard.GetImage

PUT IMAGE INTO FORM:

What this is doing is setting your forms background image with the captured image which is located in your clipboard which is why we had to back it up.
Code:
Me.BackgroundImage = My.Computer.Clipboard.GetImage

This will restore your clipboard to what it was before.
Code:
My.Computer.Clipboard.SetText(BackUpClipboard)

Note: Backing up is not needed!

Feel free to comment!