Return even numbers

Write a method that returns a string of even numbers greater than 0 and less than 100.
Expected input and output
ReturnEvenNumbers() → "2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98"
using System;

namespace CSharpExercises.Exercises.Loops
{
    class ReturnEvenNumbersTask
    {
        static string ReturnEvenNumbers()
        {
            string str = string.Empty;
            for (int i = 1; i < 100; i++)
            {
                if (i % 2 == 0)
                {
                    str += i + " ";
                }
            }

            return str;
        }

        static void Main(string[] args)
        {
            Console.WriteLine(ReturnEvenNumbers()); // 2 4 6 8 10 12 14 16 18 20 22 
            // 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68
            // 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98
        }
    }
}