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Asked: May 10, 20262026-05-10T15:28:16+00:00 2026-05-10T15:28:16+00:00

I am maintaining .net 1.1 and .net 3.5 c# code at once. For this

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I am maintaining .net 1.1 and .net 3.5 c# code at once. For this purpose I created two csproject files, one for .net 1.1 and another for .net 3.5.

Now, in my source code I am adding new features that are only available in .net 3.5 version, but I also want the code to compile in VS 2003, without the new features. Is there anyway to do a conditional compile based on the compiler version?

In C++ I can do this by checking the value for the macro _MSC _VER, but I am looking for an C# equivalent.

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  1. 2026-05-10T15:28:16+00:00Added an answer on May 10, 2026 at 3:28 pm

    You can define a different symbols in each CSPROJ file and refer to those in the C# source.

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