C# - Loop only when a number changes

Question

Example of my code:

string value = client.DownloadString("http://www.site.com/value.html"); // There is a value of something like a1x6b2xs2 (just one line with random numbers that changes randomly).
Console.WriteLine(value);
Console.ReadKey();

That's all the code! I need to make the console write the number again only if the value in the site got changed! And make it a nonstop loop, just write the number again and again, but only if the old value is changed.

Answer 1

Why don't you just keep the previous number in a variable and check that before printing?

int previousNumber = int.MinValue; // some invalid value 
while (isRunning) {
    // wait three minutes
    int currentNumber = GetNumberFromSite();
    if (currentNumber != previousNumber) {
        Console.WriteLine(currentNumber);
        previousNumber = currentNumber;
    }
}