Convert string to byte array and viceversa

                   byte[] elementByteContent= contentObject.Content; //  this  byte array content
                    string elementStringContent = System.Text.Encoding.UTF8.GetString(elementByteContent);
                    elementStringContent = elementStringContent.Replace(" ", "");
                    if (elementStringContent == string.Empty)
                    {
                        elementStringContent = "<P>&nbsp;</P>";
                        contentObject.Content = System.Text.Encoding.UTF8.GetBytes(elementStringContent);
                    }