List<int> list = Enumerable.Range(number, 100).ToList();
string s = string.Join(", ",list.Select(x =>x.ToString()));
Console.WriteLine(s);

public class Hundred
{
 public static int printNumber(int number) {
 if (number == 101)
 return 0;
 Console.Write(string.Format("{0}{1}", number, number != 100 ? ", " : "."));
 return printNumber(number + 1);
 }
}

using System; 
class GFG{ 
static public void Main () 
{ 
 int i = 0; 
 begin: 
        i = i + 1; 
 Console.Write(" " + i + " "); 
 if (i < 100) 
 { 
 goto begin; 
 } 
} 
}