How to store the AES Rijndael generated Key to the database?

RijndaelManaged myRijndael = new RijndaelManaged();

RijndaelManaged myRijndael = new RijndaelManaged();

// to Base64
string keyb64 = Convert.ToBase64String(myRijndael.Key);

// reverse
myRijndael.Key = Convert.FromBase64String(keyb64);