To develop Web application using .Net 1.1 and Visual Studio 2003 on Vista OS (IIS 7), follow the below steps:
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First of all you have to install Visual Studio 2003. this will install .Net 1.1 also
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Install all service packs for .Net framwork 1.1.
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Open the IIS Manager and navigate to the server root. (Not a website root, above that – the machine name.) and double click on "ISAPI and CGI restrictions."
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Add the v1.1 aspnet_isapi.dll to "Allowed" restrictions
(it’ll be at %WinDir%\Microsoft.NET\Framework\v1.1.4322\aspnet_isapi.dll)
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Navigate to the website root in IIS manager and double-click "ISAPI Filters."
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Add the ASP.NET 1.1 ISAPI filter from %WinDir%\Microsoft.NET\Framework\v1.1.4322\aspnet_filter.dll
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Go to the website root again in IIS manager and loo at "Advanced Settings."
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Ensure the website is using an ASP.NET 1.1 Application Pool (Vista created one for me when I installed .NET 1.1 – you may need to create one yourself.)
Done.. Now you can develop and debug .Net 1.1 Web Applications on Vista OS and IIS 7.0