Random Numbers in C#

The Random class in C# provides pseudorandom number generation.

using System;

class RandomNumbers
{
    static void Main()
    {
        // Create a new instance of Random
        Random random = new Random();

        // Next(int) returns a random integer that is less than the specified maximum
        Console.Write(random.Next(100) + ",");
        Console.WriteLine(random.Next(100));

        // NextDouble() returns a random floating-point number between 0.0 and 1.0
        Console.WriteLine(random.NextDouble());

        // This can be used to generate random floats in other ranges, for example 5.0 <= f' < 10.0
        Console.Write((random.NextDouble() * 5) + 5 + ",");
        Console.WriteLine((random.NextDouble() * 5) + 5);

        // If you want a known seed, create a new Random instance with a specific seed
        Random random2 = new Random(42);
        Console.Write(random2.Next(100) + ",");
        Console.WriteLine(random2.Next(100));

        // Using the same seed will produce the same sequence of random numbers
        Random random3 = new Random(42);
        Console.Write(random3.Next(100) + ",");
        Console.WriteLine(random3.Next(100));
    }
}

To run the program, compile and execute it:

$ csc RandomNumbers.cs
$ mono RandomNumbers.exe
68,56
0.8090228139659177
5.840125017402497,6.937056298890035
94,49
94,49

Note that some of the generated numbers may be different when you run the sample, except for the ones generated with a specific seed.

See the Random Class documentation for references on other random quantities that C# can provide.

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Random Numbers in C#