Changed SaveJson and LoadJson methods

Json format:

[{"tbl":"tb1","col":{"col1":"DateTime","col2":"Int32","col3":"String","col4":"Boolean"},"row":[{"col1":"2014/9/9-17:28:42.606","col2":"1","col3":"ritu","col4":null,"rowstate":8},{"col1":"2014/9/9-17:28:42.609","col2":"2","col3":"suraj","col4":null,"rowstate":2},{"col1":"2014/9/9-17:28:42.609","col2":"3","col3":"hatti","col4":null,"rowstate":2},{"col1":"2014/9/9-17:28:42.609","col2":"3","col3":"hattimatim","col4":null,"rowstate":2}]},{"tbl":"tb2","col":{"col1":"DateTime","col2":"Int32","col3":"String","col4":"Boolean"},"row":[{"col1":"2014/9/9-17:28:42.609","col2":"11","col3":"ritu1","col4":null,"rowstate":2}]}]