Generate Random AES Encryption Key

AesKeyGenerator.cs

public static class AesKeyGenerator
{
  public static string GenerateKey(int bitStrength)
  {
    // note: valid bit strength for aes: 128, 192, or 256 bits (16, 24, or 32 bytes)

    var random = new System.Security.Cryptography.RNGCryptoServiceProvider();
    var keyArray = new byte[bitStrength / 8];
    random.GetBytes(keyArray);
    var base64key = Convert.ToBase64String(keyArray);
    
    return base64key;
  }
}

visual-studio-interactive-window-one-liner

Using Visual Studio's "C# Interactive" screen you can generate a key in a single line:

var keyArray = new byte[32]; (new System.Security.Cryptography.RNGCryptoServiceProvider()).GetBytes(keyArray); Convert.ToBase64String(keyArray);

more info: https://aaron-hoffman.blogspot.com/2017/08/generate-random-aes-encryption-key.html