Ejecutar el archivo DLL

// open cmd in project location then type as follow
// dotnet intalled location          run   loaction of dll file
"C:\Program Files\dotnet\dotnet.exe" run   \bin\Debug\net6.0\NotePad++.dll
// if You haven't builde the program then first build it 
"C:\Program Files\dotnet\dotnet.exe" build ProjectName.csproj
PrashantUnity