How to convert java code in C#

public static final String AES_TRANSFORMATION = "AES/ECB/PKCS5Padding";
	public static final String AES_ALGORITHM = "AES";
	public static final int ENC_BITS = 256;
	public static final String CHARACTER_ENCODING = "UTF-8";
	
	private static Cipher ENCRYPT_CIPHER;
	private static Cipher DECRYPT_CIPHER;
	private static KeyGenerator KEYGEN;	
	
	static{
		try{
			ENCRYPT_CIPHER = Cipher.getInstance(AES_TRANSFORMATION);
			DECRYPT_CIPHER = Cipher.getInstance(AES_TRANSFORMATION);
			KEYGEN = KeyGenerator.getInstance(AES_ALGORITHM);
			KEYGEN.init(ENC_BITS);
		}catch(NoSuchAlgorithmException | NoSuchPaddingException e) {
			e.printStackTrace();
		}
	}
	private static String generateSecureKey() throws Exception{
		SecretKey secretKey = KEYGEN.generateKey();
		return encodeBase64String(secretKey.getEncoded());
	}

public byte[] GenerateKey()
    {
                    
        using (var aes = CreateAes256Algorithm())
        {

            aes.GenerateKey();
            return aes.Key;
        }
    }

    private RijndaelManaged CreateAes256Algorithm()
    {
        return new RijndaelManaged { KeySize = 256, BlockSize = 128, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 };
    }