My Json file is like this

```
{
"Hello" : [{
      "CommentId":28227,
      "Comments":"User Philip John has added a new file",
      "DisplayComments":"User <a id='getUser' data='205' >Philip John</a> has added a new file.",
      "Users":[
         { "UserId":"1", "UserName":"User one" },
         { "UserId":"2", "UserName":"User two" }
      ]
},{
      "CommentId":28226,
      "Comments":"docs",
      "DisplayComments":"docs",
      "RefCommentId":28226,
      "IsSystemGenerated":0,
      "CommentDate":"2014-09-17T06:51:47.317",
      "Users": [
         {"UserId":"1","UserName":"User one"},
         {"UserId":"3","UserName":"User Three"}
         ]
},{
      "CommentId":28225,
      "Comments":"New Group aa has been created.",
      "DisplayComments":"New Group <a id='getGroup' data='88' >aa</a> has been created.",
      "RefCommentId":28225,
      "IsSystemGenerated":1,
      "CommentDate":"2014-09-16T07:21:38.493",
      "Users":[
         {"UserId":"3","UserName":"User three"},
         {"UserId":"4","UserName":"User four" }
      ]
},{
      "CommentId":28224,
      "Comments":"New Group Philip has been created.",
      "DisplayComments":"New Group <a id='getGroup' data='87' >ss</a> has been created.",
      "RefCommentId":28224,
      "IsSystemGenerated":1,
      "CommentDate":"2014-09-16T06:00:58.897",
      "Users":null
}]}

```