Creating readable MSSqlServer DataBase SnapShot

I often need to create  database snapshot to compare current snapshot  with old snapshot.  I tried to use standard MSSQL BackUp’s and compare binary files. But it’s very difficult to find row (value) that differing.  I don’t find a free tool for saving database in plane text. And write the following function (this function can be added in nant script )

// username is login for local sqlserver instance
//dbname is database name on local sqlserver
//filename is name of out file(name of snapshot)
private static void MakeSQLDump(string username, string dbname, string filename) {
         string gettables =
             @"select table_name
                    FROM  INFORMATION_SCHEMA.TABLES
                    WHERE     (TABLE_TYPE = 'BASE TABLE')
                    order by table_name ";
         string connstr = string.Format("Data Source={0};Initial Catalog={1};Integrated Security=True", username, dbname);
         SqlConnection conn = new SqlConnection(connstr);
         conn.Open();
         SqlCommand gettablescommand = new SqlCommand(gettables, conn);
         SqlDataReader reader = gettablescommand.ExecuteReader();
         List<string> TablesList = new List<string>();
         while (reader.Read()) {
            TablesList.Add(reader.GetString(0));
         }
         reader.Close();
         string getvaluescommandTxt = "select * from {0} order by recnum";
         string GetcolumsNameCommandtxt = "SELECT INFORMATION_SCHEMA.COLUMNS.Column_Name FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='{0}'";
         SqlCommand getvaluescommand = new SqlCommand("", conn);
         foreach (string tablename in TablesList) {
            string tmp = "";
            getvaluescommand.CommandText = string.Format(GetcolumsNameCommandtxt, tablename);
            SqlDataReader columsreader = null;
            try {
               columsreader = getvaluescommand.ExecuteReader();
               tmp = string.Format("[{0}]{1}", tablename, Environment.NewLine);
               while (columsreader.Read()) {
                  tmp += string.Format("{0}, ", columsreader.GetString(0));
               }
               tmp.TrimEnd(',');
               tmp += Environment.NewLine;
               WriteStringIntoFile(tmp, filename);
            }
            catch { }
            finally {
               if (columsreader != null)
                  columsreader.Close();
            }

            getvaluescommand.CommandText = string.Format(getvaluescommandTxt, tablename);
            SqlDataReader valreader = null;
            try {

               valreader = getvaluescommand.ExecuteReader();
               tmp = "";
               while (valreader.Read()) {
                  for (int i = 0; i < valreader.FieldCount; i++) {
                     if (valreader.IsDBNull(i)) tmp += "";
                     else tmp += string.Format("\"{0}\"", valreader.GetValue(i));
                     if (i < (valreader.FieldCount - 1)) tmp += ", ";
                  }
                  tmp += Environment.NewLine;
                  WriteStringIntoFile(tmp, filename);
                  tmp = "";
               }
            }
            finally {
               if (valreader != null)
                  valreader.Close();
            }
         }
      }