How to write decryption code in c# [closed]

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To encode a string

Code:

public string base64Encode(string data)
{
    try
    {
        byte[] encData_byte = new byte[data.Length];
        encData_byte = System.Text.Encoding.UTF8.GetBytes(data);    
        string encodedData = Convert.ToBase64String(encData_byte);
        return encodedData;
    }
    catch(Exception e)
    {
        throw new Exception("Error in base64Encode" + e.Message);
    }
}

---

public string Base64Decode(string data)
{
    byte[] byteArray = Convert.FromBase64String(data);
    var message = System.Text.Encoding.UTF8.GetString(byteArray);
    return message;
}

---

Have a look at Convert.FromBase64String.