Hi, I'm using a dll file like this : #using <mscorlib.dll> but my compiler gives me the error : fatal error C1190: managed targeted code requires '#using <mscorlib.dll>' and '/clr' option If i change the 'Used Managed Extensions' option to Yes, all the other classes i made are beeing compiled also with this option. How can i code this option inline so only this dll file is compiled with /clr option ? (I already found the method #pragma unmanaged and #pragma managed but do i have to put this before every class/function i already made ?) Thanks. (C++)