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    Creating random test data with random characters in C# can be achieved using various approaches. Below are two common methods to generate random strings, including alphanumeric and custom character sets.

    1. Using Random Class

    This method uses the Random class to generate random characters.

    using System;

    class Program
    {
    static void Main()
    {
    Random random = new Random();
    const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    int length = 10; // Length of the random string

    string randomString = new string(Enumerable.Repeat(chars, length)
    .Select(s => s[random.Next(s.Length)]).ToArray());

    Console.WriteLine($"Random String: {randomString}");
    }
    }
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    • Explanation: The chars string contains the pool of characters to choose from. Enumerable.Repeat repeats the character set for the desired length. random.Next selects a character randomly from the pool.

    2. Using Cryptographically Secure Random Numbers

    For more secure randomness (e.g., for passwords), use RandomNumberGenerator.

    using System;
    using System.Security.Cryptography;

    class Program
    {
    static void Main()
    {
    const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    int length = 10; // Length of the random string
    char[] result = new char[length];

    using (var rng = RandomNumberGenerator.Create())
    {
    byte[] buffer = new byte[length];
    rng.GetBytes(buffer);

    for (int i = 0; i < length; i++)
    {
    result[i] = chars[buffer[i] % chars.Length];
    }
    }

    Console.WriteLine($"Secure Random String: {new string(result)}");
    }
    }
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    Source Domain logoGitHub
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    How to Generate Random Alphanumeric Strings in C# - Delft Stack
    Delft Stack
    How do I generate a random char in JavaScript?

    public string GenerateChar(int count) string randomString = ""; for (int i = 0; i < count; i++) nahodneZnaky += GenerateChar(); return randomString; Try using the same random object for the whole string, rather than initializing one for each char.

    stackoverflow.com
    1. Stack Overflow
      https://stackoverflow.com › questions

      c# - How can I generate random alphanumeric strings? - Stack Overflow

      Aug 28, 2009 · It's very common to exclude characters such as I and O from these types of random strings to avoid humans confusing them with 1 and 0. If you don't care about having a human …

    2. GeeksForGeeks
      https://www.geeksforgeeks.org › c-sharp › c-sharp...

      C# - Randomly Generating Strings - GeeksforGeeks

      Jul 23, 2025 · In this article, we will learn how to randomly generate strings and alphanumeric strings. So to do the task we use the Random class although it generates integers we can use them to create …

    3. Microsoft Learn
      https://learn.microsoft.com › en-us › dotnet › api › system.random.getstring

      Random.GetString(ReadOnlySpan<Char>, Int32) Method (System)

      Creates a string populated with characters chosen at random from choices.

    4. Dot Net Perls
      https://www.dotnetperls.com › random-string

      C# - Random String - Dot Net Perls

      Feb 9, 2025 · With the Path class, we can obtain a random string. This method has a limitation on the length of the result, which means you may need to call it more than once or truncate the result.

    5. Delft Stack
      https://www.delftstack.com › howto › csharp › generate...

      How to Generate Random Alphanumeric Strings in C

      Feb 16, 2024 · There are 3 main methods that can be used to generate random alphanumeric strings in C#, the Random class, the LINQ method, and the RNGCryptoServiceProvider class.

    6. webdevtutor.net
      https://www.webdevtutor.net › blog › c-sharp-create-random-string-of-length

      Generating Random Strings of Specified Length in C#

      Jul 22, 2024 · When working with C#, there are several ways to create random strings of a specified length. This can be useful for generating passwords, tokens, or any random data required in your …

    7. Conrad Akunga, Esquire. Code
      https://www.conradakunga.com › blog › generating-a-random-string-in-c-net

      Generating A Random String In C# & .NET - conradakunga.com

      Aug 2, 2025 · Using a known alphabet and the Random class, we can generate random strings of arbitrary lengths. The code is in my GitHub. Happy hacking! A common requirement you will run into …

    8. Software Testing Help
      https://www.softwaretestinghelp.com › csharp-random...

      C# Random Number And Random String Generator With …

      Apr 1, 2025 · Learn how to generate C# Random Number, Random Alphabets and Ramdom String containing special characters in this informative C# tutorial with code examples.

    9. CSharp Academy
      https://csharp.academy › how-to-generate-random-string

      C# – How to generate random string - CSharp Academy

      Mar 27, 2022 · There are situations where you need a random string which is built with specific characters. In this article you’ll see how to generate such string where both length and elements are …

    10. letsupdateskills.com
      https://www.letsupdateskills.com › article › how-can...

      Generating Random Alphanumeric Strings in C#: Best Methods

      Learn how to generate random alphanumeric strings in C# using techniques like Random, Guid, and custom string builders.

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