To copy a text or a image to the windows clipboard you can use the following snippet.

Sample C#

public void CopyToClipboard(string input, bool keepAlive)
{
    System.Windows.Forms.Clipboard.SetDataObject(input, keepAlive);
}

public void CopyToClipboard(Image img, bool keepAlive)
{
    System.Windows.Forms.Clipboard.SetDataObject(img, keepAlive);
}

Sample VB.NET

Public Sub CopyToClipboard(input As String, keepAlive As Boolean)
	System.Windows.Forms.Clipboard.SetDataObject(input, keepAlive)
End Sub

Public Sub CopyToClipboard(img As Image, keepAlive As Boolean)
	System.Windows.Forms.Clipboard.SetDataObject(img, keepAlive)
End Sub

for more informations see the MSDN Clipboard.SetDataObject Method