pinvoke.net: Edit: msi.MsiQueryProductState

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Summary: Returns the installed state for a product.

!!!!C# Signature:
 [DllImport("msi.dll", SetLastError=true)]
 static extern INSTALLSTATE MsiQueryProductState(string product);

!!!!VB Signature:
 Declare Function MsiQueryProductState Lib "msi.dll" (ByVal product As String) As INSTALLSTATE

!!!!User-Defined Types:
None.

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

!!!!Notes:
Makes use of the INSTALLSTATE enum, which can be found here - http://pinvoke.net/default.aspx/Enums.INSTALLSTATE

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:

using System;
 using System.Runtime.InteropServices;

public class QueryProductState
 {
	[DllImport("msi.dll")]
	private static extern INSTALLSTATE MsiQueryProductState(string product);

public static void Main(string[] args)
	{
		INSTALLSTATE state = MsiQueryProductState("{11111111-2222-3333-4444-555555555555}");
		
		Console.WriteLine(state);
	}
 }

Documentation: http://msdn2.microsoft.com/en-us/library/aa370363.aspx