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How do I change the desktop background using VB.NET?

You will need to declare the WinAPI call SystemParameterInfo first :-

Public Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long

Then use the following function passing in the name of the bitmap for the background

Function SetDesktop(ByVal strFilename As String) As Boolean
     Try
          SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, strFilename, 1)
          Return True
     Catch ex As Exception
          Return False
     End Try
End Function

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