C# random string generator.

random_string_gen.cs

// possible characters for the random strings generation
static string _charsForRandomness = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

/// <summary>
/// Generate a random string at a given length.
/// </summary>
public static string GenerateRandomString(int length = 8)
{
    // generate random characters
    var stringChars = new char[length];
    var random = new Random();
    for (int i = 0; i < stringChars.Length; i++)
    {
        stringChars[i] = _charsForRandomness[random.Next(_charsForRandomness.Length)];
    }

    // turn to string and return
    var randomString = new String(stringChars);
    return randomString;
}