C# - String to BASE64 and vise versa

public String StringToBASE64(String message)
{
     String _strBASE64 = null;
     Byte[] _byteArray = System.Text.Encoding.UTF8.GetBytes(message);
     _strBASE64 = Convert.ToBase64String(_byteArray);

     return _strBASE64;
}

public String BASE64ToString(String message)
{
     String _strResult = null;
     Byte[] _byteArray = Convert.FromBase64String(message);
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     _strResult = System.Text.Encoding.UTF8.GetString(_byteArray);

     return _strResult;

}

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