C# Signature:

[DllImport("msi.dll", CharSet=CharSet.Unicode)]
static extern MSICONDITION MsiEvaluateCondition(IntPtr hInstall, string szCondition);

User-Defined Types:

MSICONDITION

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

Please add some!

Alternative Managed API:

MSI interop library

http://sourceforge.net/project/showfiles.php?group_id=40188&package_id=110212