SQLite读写BLOB

SQLiteParameter[] parameters = { 
                    new SQLiteParameter("ID",this.txID.Text.Trim() ),
                    new SQLiteParameter("KEY",this.txKey.Text.Trim() ),
                    new SQLiteParameter("CONTENT",DbType.Binary),
                };

            //ASCIIEncoding asiEnc = new ASCIIEncoding();
            //byte[] btContent = asiEnc.GetBytes(strContent);

            UTF8Encoding asiEnc = new UTF8Encoding();
            byte[] btContent = asiEnc.GetBytes(strContent);            

            parameters[2].Value = btContent;


//////////////////////////////////////////////////////////////////
 byte[] btContent = (reader["CONTENT"] as byte[]);
                    if (btContent != null) {
                        //ASCIIEncoding asiEnc = new ASCIIEncoding();
                        UTF8Encoding asiEnc = new UTF8Encoding();                        
                        Response.Write(asiEnc.GetString(btContent));
                    }