using System;

public class Program

{

    public static void Main()

    {

        string str1 = "First String";

        int String1Count = 4;

​

        string str2 = "Second String";

        int String2Count = 7;

​

        string str3 = "Third String";

        int String3Count = 5;

​

        string[] arr1 = new string[100];

​

        int sum12 = String1Count + String2Count;

        int sum123 = String1Count + String2Count + String3Count;

​

        for (int i = 0; i < arr1.Length; i++)

        {

            if (i % sum123 < String1Count)

                arr1[i] = str1;

            else if (i % sum123 < sum12)

                arr1[i] = str2;

            else if (i % sum123 < sum123)

                arr1[i] = str3;

        }

        foreach (var item in arr1)

        {

                Console.WriteLine(item+"\n");

        }

    }

}