Problem while sending parameters from json to web service in ASP.NET

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C#

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I have created one web service with two methods. First method is without parameter calling on load which is working fine, my second method have dateparameter(textbox), i am not getting parameter value in code behind (on buttong click i am calling this parametrised function)

<script type="text/javascript">
        $j = $.noConflict();
        $j(document).ready(function () {
            $j.ajax({
                type: "POST",
                dataType: "json",
                url: "ClaimService.asmx/GetClaims",
                success: function (data) {
                    var datatableVariable = $j('#example2').DataTable({
                        data: data,
                        "bLengthChange": false,
                        "bFilter": false,
                        "bPaginate": true,
                        "pageLength": 10,
                        columns: [
                         { 'data': 'Name' },
                         { 'data': 'IntimationDate' },
                         { 'data': 'PolicyNo' },
                         { 'data': 'Status' },
                         ]
                    });
                }
            });

        });

        function GetDataByFilter() {
            var startDate = $j("[id*=startDate]").val();
            $j.ajax({
                type: "POST",
                dataType: "json",
                url: "ClaimService.asmx/GetClaimsByFilter",
                //data: '{"startDate": ' + startDate + '}',
                data: "{startDate: '" + startDate + "'}",
                success: function (data) {
                    var datatableVariable = $j('#example2').DataTable({
                        data: data,
                        "bLengthChange": false,
                        "bFilter": false,
                        "bPaginate": true,
                        "pageLength": 10,
                        columns: [
                         { 'data': 'Name' },
                         { 'data': 'IntimationDate' },
                         { 'data': 'PolicyNo' },
                         { 'data': 'Status' },
                         ]
                    });
                }
            });
        }    
    </script>

[WebMethod]
        public void GetClaims()
        {
            var cs = ConfigurationManager.ConnectionStrings["SQLConnection"].ConnectionString;
            var students = new List<MemberDetails>();
            using (var con = new SqlConnection(cs))
            {
                var cmd = new SqlCommand("select * from Claim_Master", con) { CommandType = CommandType.Text };
                con.Open();
                var dr = cmd.ExecuteReader();
                while (dr.Read())
                {
                    var student = new MemberDetails
                    {
                        Name = dr["FirstName"].ToString(),
                        IntimationDate = dr["IntimationDate"].ToString(),
                        PolicyNo = dr["PolicyNo"].ToString(),
                        Status = dr["Status"].ToString()
                        //DocumentsReceived = dr["Document Recived"].ToString(),
                        //DocumentsPending = dr["Document Pending"].ToString()
                    };
                    students.Add(student);
                }
            }
            var js = new JavaScriptSerializer();
            Context.Response.Write(js.Serialize(students));
        }

        [WebMethod]
        public void GetClaimsByFilter(string startDate)
        {
            var cs = ConfigurationManager.ConnectionStrings["SQLConnection"].ConnectionString;
            var students = new List<MemberDetails>();
            using (var con = new SqlConnection(cs))
            {
                var cmd = new SqlCommand("select * from Claim_Master", con) { CommandType = CommandType.Text };
                con.Open();
                var dr = cmd.ExecuteReader();
                while (dr.Read())
                {
                    var student = new MemberDetails
                    {
                        Name = dr["FirstName"].ToString(),
                        IntimationDate = dr["IntimationDate"].ToString(),
                        PolicyNo = dr["PolicyNo"].ToString(),
                        Status = dr["Status"].ToString()
                        //DocumentsReceived = dr["Document Recived"].ToString(),
                        //DocumentsPending = dr["Document Pending"].ToString()
                    };
                    students.Add(student);
                }
            }
            var js = new JavaScriptSerializer();
            Context.Response.Write(js.Serialize(students));
        }

thanks in advance.

What I have tried:

I checked in browser i can see date value but i am not getting value in code behind, it is not coming into that second method (GetClaimsByFilter)