Set the Path Environment Variable
NDO uses two Microsoft programs that are installed as part of the Visual Studio .NET installation. These are ILAsm.exe and ILDasm.exe.
ILAsm is part of .NET and can be found in the directory <Windows directory>\Microsoft.NET\Framework\v4.0.xxxxx. <Windows directory> must be replaced with the actual directory of your Windows Installation. The framework version depends on the installed .NET version.
ILDasm is part of the.NET Framework SDK. If you accepted the defaults during setup of Visual Studio it can be found in the directory: C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.6 Tools. Adjust the version numbers as appropriate to your VS and Windows versions.
NDO tries to find the named applications automatically. If it fails, you will get an error message during the compilation process. If this occurs, make sure that the directories containing the above named programs are included in the path environment variable:
1. Right-click on My Computer and choose Properties.
2. Click the Advanced tab, and then click Environment Variables.
3. Look for PATH in the User Variables. If it does not exit, click New and enter Path in the Variable Name edit field. If it exists, select it and click Edit
4. Add the two directories in the edit field, each separated with a semicolon.
5. Click Ok