Use string.Format to format integer

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using System;

public class TestConsoleApp {
    public static void Main(string[] args) {
        string s = string.Format("123");
        string t = string.Format("{0}", 123);
        string u = string.Format("{0:D3}", 123);
        Console.WriteLine(s);
        Console.WriteLine(t);
        Console.WriteLine(u);
    }
}

   
     


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