Generating random number and string in asp.net c#

Random class defined in the .NET Framework class library provides functionality to generate random numbers.

The Random class constructors have two overloaded forms. It takes either no value or it takes a seed value, Random class has three public methods - Next, NextBytes, and NextDouble. Next method returns a random number, NextBytes returns an array of bytes filled with random numbers, and NextDouble returns a random number between 0.0 and 1.0. The Next method has three overloaded forms and allows you to set the minimum and maximum range of the random number

Below is the class that generate random number, random string and calculate a random password just copy and paste this class and use these instance methods, call GetPassword() method to get a random password that contains combination string of 4 char size, number of 4 size and string of 2 chat size respectively.

Generating Random Number and String in C#

 public class Random_Number

{

    private int RandomNumber(int min, int max)

    {

        Random random = new Random();

        return random.Next(min, max);

    }

    private string RandomString(int size, bool lowerCase)

    {

        StringBuilder builder = new StringBuilder();

        Random random = new Random();

        char ch;

        for (int i = 0; i < size; i++)

        {

            ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));

            builder.Append(ch);

        }

        if (lowerCase)

            return builder.ToString().ToLower();

        return builder.ToString();

    }

    public string GetPassword()

    {

        StringBuilder builder = new StringBuilder();

        builder.Append(RandomString(4, true));

        builder.Append(RandomNumber(1000, 9999));

        builder.Append(RandomString(2, false));

        return builder.ToString();

    }

}