Wie drucke ich ein binäres Dreieck mit C#?

for (int i = 1; i <= n; i++) {

   for (j = 1; j <= i; j++) {
      if (a == 1) {
         Console.Write("0");
         a = 0;
      } else if (a == 0) {
         Console.Write("1");
         a = 1;
      }
   } Console.Write("");
}

1
01
010
1010
10101
010101
0101010

using System;
namespace Program {
   public class Demo {
      public static void Main(String[] args) {

         int j;
         int a = 0, n = 7;
         // looping from 1 to 7
         for (int i = 1; i <= n; i++) {
            for (j = 1; j <= i; j++) {
               if (a == 1) {
                  Console.Write("0");
                  a = 0;
               } else if (a == 0) {
                  Console.Write("1");
                  a = 1;
               }
            } Console.Write("");
         }
         Console.ReadLine();
      }
   }
}