#line
controls the line number and filename reported by the compiler when outputting warnings and errors.
void Test()
{
#line 42 "Answer"
#line filename "SomeFile.cs"
int life; // compiler warning CS0168 in "SomeFile.cs" at Line 42
#line default
// compiler warnings reset to default
}
#pragma checksum
allows the specification of a specific checksum for a generated program database (PDB) for debugging.
#pragma checksum "MyCode.cs" "{00000000-0000-0000-0000-000000000000}" "{0123456789A}"