How to Get Csc.Exe Path

Where to find csc.exe in .NET Framework 4.5?

CSC present in 4.0 folder (C:\Windows\Microsoft.NET\Framework64\v4.0.30319) is also csc of 4.5.
Path C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe is for 64 bit version of framework.

Could not find a part of the path ... bin\roslyn\csc.exe

The problem with the default VS2015 templates is that the compiler isn't actually copied to the tfr\bin\roslyn\ directory, but rather the {outdir}\roslyn\ directory

Add this code in your .csproj file:

<Target Name="CopyRoslynFiles" AfterTargets="AfterBuild" Condition="!$(Disable_CopyWebApplication) And '$(OutDir)' != '$(OutputPath)'">
    <ItemGroup>
      <RoslynFiles Include="$(CscToolPath)\*" />
    </ItemGroup>
    <MakeDir Directories="$(WebProjectOutputDir)\bin\roslyn" />
    <Copy SourceFiles="@(RoslynFiles)" DestinationFolder="$(WebProjectOutputDir)\bin\roslyn" SkipUnchangedFiles="true" Retries="$(CopyRetryCount)" RetryDelayMilliseconds="$(CopyRetryDelayMilliseconds)" />
</Target>

csc' is not recognized as an internal or external command, operable program or batch file

Locate the path of csc.exe and add it your PATH environment variable.

In my case, the path for 64-bit C# compiler is C:\Windows\Microsoft.NET\Framework64\v4.0.30319.

Similarly, you can look for 32-bit C# compiler in C:\Windows\Microsoft.NET\Framework under different .NET framework version directories

There will be csc.exe for all versions like v2.0.XXXXX and v3.5. Select the one with the highest version in Framework64/Framework directory depending on your requirement.

Copy the path of csc.exe and add it to the PATH system environment variable.

Quit the cmd, and then launch again and run the program. That'd work.

How can I determine the path to the C# compiler?

Is there any reason you want to invoke the binary directly, instead of using CSharpCodeProvider to programmatically compile?

You may be interested in my own snippet compiler (Snippy), which you can download the source for on my C# in Depth site.

Where on Earth is csc.exe?

It is in C:\windows\Microsoft.NET\Framework\v4.0.30319\csc.exe.

Of course, the path will be different for different framework versions.