-nostdlib prevents the import of mscorlib.dll, which defines the entire System namespace.
-nostdlib[+ | -]
Use this option if you want to define or create your own System namespace and objects.
If you do not specify -nostdlib, mscorlib.dll will be imported into your program (same as specifying -nostdlib-). Specifying -nostdlib is the same as specifying -nostdlib+.
1.Open the Properties page for the project.
2.Click the Build properties page.
3.Add the option in the "User-Defined Command Line options" property