How to deserialize these?

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JSON

Needs to be dynamic since the rows are dynamic. Also cannot use other 3rd party dll since application is .net 3.5. I am using JavaScriptSerializer

{
 "0": {
        "caseNumber": "###",
        "name": "###, ###",
        "birthYear": "###",
        "caseLocation": "###",
        "caseType": "###",
        "dateFiled": "##/##/##",
        "type": "",
        "query": {
            "firstName": "###",
            "lastName": "###",
            "dateOfBirth": "####-##-##",
            "fileDateBegin": "####",
            "fileDateEnd": "####"
        },
        "color": "###",
        "names": [
            "###, ###"
        ],
        "rank": "###",
        "s": ###
    },
    "1": {
        "caseNumber": "###",
        "name": "###, ###",
        "birthYear": "###",
        "caseLocation": "###",
        "caseType": "###",
        "dateFiled": "##/##/##",
        "type": "",
        "query": {
            "firstName": "###",
            "lastName": "###",
            "dateOfBirth": "####-##-##",
            "fileDateBegin": "####",
            "fileDateEnd": "####"
        },
        "color": "###",
        "names": [
            "###, ###"
        ],
        "rank": "###",
        "s": ###
    },
    "failed": 0
}

What I have tried:

With jsonconvert. But needed to create a stand alone class since application is .net 3.5 framework and doesn't work with newer newtown.json

Tried this but did not get any rows back.

public class SearchIndex
{
    public string caseNumber { get; set; }
    public string name { get; set; }
    public int? birthYear { get; set; }
    public string caseLocation { get; set; }
    public string caseType { get; set; }
    public DateTime? dateFiled { get; set; }
    public string type { get; set; }
    public string color { get; set; }
}