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Asked: 2026-05-13T06:07:56+00:00

Curious about things to consider to avoid any code breaks, etc to upgrade from

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Curious about things to consider to avoid any code breaks, etc to upgrade from .NET 3.5 to 4.

I am particularly interested in:
– What would be the server requirements to deploy a .NET 4 app? Does it need any particular version of IIS and Windows Server to run?

I am facing serious performance issues with Entity Framework due to the large size of database and initialization takes long time for the first user to login. .NET 4 seems to realize this as a widespread issue and has something called PreWarm apps. Scottgu’s post here seems to talk more about it. But, curious if this will work on IIS 6 and WinServer 2003.

Are there any other things i need to think of before making the switch to .NET 4?

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  1. Editorial Team

    .NET Framework 4 Beta 2 can be installed on Windows Server 2003. The software requirements are:

    Supported Operating Systems: Windows
    Server 2003; Windows Server 2008;
    Windows Vista; Windows XP

    .NET Framework 4 can be installed on the
    following operating systems:
    – Windows XP SP3
    – Windows Server 2003 SP2
    – Windows Vista SP1
    – Windows 7
    – Windows Server 2008 (not supported on Server Core Role)
    – Windows Server 2008 R2 (not supported on Server Core Role)
    Note that .NET Framework 4 is currently in Beta. If you have a working app on production, you might want to consider waiting for its RTM.

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