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Problems with .NET 2.0 and .NET 1.1 both residing on system

Posted By:      Posted Date: September 06, 2010    Points: 0   Category :.NET Framework
I have a product that is built with VS 2003.  It has been working well since 2006.  But recently, some customers are experiencing problems if BOTH .NET 1.1 (v 1.1.4322.1033) and .NET 2.2.30729 are on the system.    My .NET app will appear for about one second, then disappear without any error messages.  I have both of these versions of .NET on my system, and my app runs fine.  Furthermore, this must be a new problem, because it just started occurring.  My app has been out there since 2006, but it is only in the past month that I have started seeing this problem on my customers' systems.   I think (but haven't proven) that every time this happens, the system also has .NET 3.0 sp2 and .NET 3.5 sp1 installed.  Sometimes, also .NET 4.0, but not always.  It happens on XP and Windows 7 systems, not sure about Vista. If I manually go into the customer's system and remove .NET 1.1, the app works fine.  No problems.  The funny part of it, is that this app was built using 2003, so one would think that it would run better under 1.1 than 2.0.  But that doesn't seem to be the case. At least recently.  In the past, it has always run with both 1.1 and 2.0 on the system. I have written quite a few test programs that try to recreate the problem, but have not been able to recreate it except in the original ap

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