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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester{
    
public class Program
{
	public static void Main(string[] args)
	{
		int mainVar = 7;
		int i;
		int max = 10;
		int y = 0;
		var ran = new Random().Next(1,25);
		
		Console.WriteLine("Random int = {0}", ran);
		Console.WriteLine("---------------------");
		
		for (i = 0; i <= ran; i++)
		{
			Console.WriteLine("Tested {0} times.", i);
		}
		
		Console.WriteLine("---------------");
		
		for ( ; ;){
			int x = new Random().Next(1,max);
			
			System.Threading.Thread.Sleep(200); // Wait func
			y = y + 1;
			
			if (x == 7){
				Console.WriteLine("---------------");
				Console.WriteLine("{0} = {1} max num = {2}", x, mainVar, max);
				Console.WriteLine("Finished on attempt {0}", y);
				break;
			}
				else{
					Console.WriteLine("{0} ~= {1} max = {2}", x, mainVar, max);
				}
			}
		}
	}
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 1,94 sec, cpu time: 0,09 sec, average memory usage: 23 Mb, average nr of threads: 5, absolute service time: 2,14 sec