Why Console_WriteLine don't accept negative values?

Click image for larger version. 

Name:	program.png 
Views:	27 
Size:	7.1 KB 
ID:	9764 Click image for larger version. 

Name:	error.png 
Views:	24 
Size:	10.0 KB 
ID:	9765

4th line is OK but 5th line says: "Error 262 - Invalid delimiter".