Help with cycle C#

Question

I have code:
int number = 11;
for (int x = 1; number >= x; x++){
if (x % 5 != 0)
Console.Write(x);}
How change example 5, 10... to “-“?
Result:
1234-6789-11

Answer 1

Just use "else" after "if" with Console.Write("-");
if(x%5 != 0)
Console.Write(x);
else
Console.Write("-");

Answer 2

omg...
rly, thank you :)