Error: Data in HighChart displaying only lines using jQuery HighChart plugin in ASP.Net

try to get data in highchart for this i try this

Here is my class

public class Category
{
    public string Name { get; set; }
    public string Employees{ get; set; }
    public int totalStudents { get; set; }
}
[WebMethod]
public static List<Category> StudentAnalysis(string category)
{
    List<Category> studentInfos = new List<Category>();
    DataSet ds = new DataSet();
    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings[1].ConnectionString))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = "GetCategoriesChart";
            cmd.CommandType = CommandType.StoredProcedure;    
            cmd.Connection = con;
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                da.Fill(ds, "Studentinfo");
            }
        }
    }
    if (ds != null)
    {
        if (ds.Tables.Count > 0)
        {
            if (ds.Tables["Studentinfo"].Rows.Count > 0)
            {
                foreach (DataRow dr in ds.Tables["Studentinfo"].Rows)
                {
                    studentInfos.Add(new Category
                    {
                        Name= dr["Name"].ToString(),
                        Employees= dr["Employees"].ToString(),
                        totalStudents = Convert.ToInt32(dr["Employees"])
                    });
                }
            }
        }
    }
    return studentInfos;
}

Javascript

<script type="text/javascript">
$(document).ready(function () {
    var cat = {};
    cat.category = '';
    GetCategories();
});
function GetCategories() {
    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        url: "WebForm4.aspx/StudentAnalysis",
        // data: JSON.stringify(cate),
         data: JSON.stringify(),
        dataType: "json",
        success: function (Result) {
            Result = Result.d;
            var uniqueCat = [];
            var uniqueProgName = [];

            $.map(Result, function (ele) {
                if (uniqueCat.indexOf(ele.CatgType) == -1)
                    uniqueCat.push(ele.CatgType);
                if (uniqueProgName.indexOf(ele.ProgName) == -1)
                    uniqueProgName.push(ele.ProgName);
            });
            var seriesData = [];
            $.each(uniqueProgName, function () {
                var series = {};
                var progName = $(this)[0];
                series.name = progName;
                var s = $.grep(Result, function (e) {
                    return e.ProgName == progName;
                });
                series.data = $.map(s, function (e) { return e.totalStudents });
                seriesData.push(series);

            });
            DreawChart(uniqueCat, seriesData);
        },
        error: function (error) {
            debugger;
            var r = error.responseText;
            var errorMessage = r.Message;
            alert(errorMessage);
            alert(r);
            alert(Error);
        }
    });
}

function DreawChart(series, seriesData) {
    $('#container').highcharts({
        chart: {
            type: 'pie',
            renderTo: 'container'
        },
        title: {
            text: 'Studentinfo'
        }, xAxis: {
            categories: eval(series)
        },
        yAxis: {
            title: {
                text: 'Figures'
            }
        },
        plotOptions: {
            pie: {
                innerSize: 100,
                depth: 45,
                allowPointSelect: true,
                cursor: 'pointer',
                dataLabels: {
                    enabled: true,
                    format: '<b>{point.name}</b>: {point.percentage:.1f} %',
                    style: {
                        color: (Highcharts.theme && Highcharts.theme.contrastTextColor) || 'black'
                    }
                }
            }
        },
        series: JSON.parse(JSON.stringify(seriesData))
    });
}
</script>

Data

Name  Employees
ABC   68
DEF   481
EFG   886
XDE   567
DFG   452

i try pie chart now in chart abc def not display like only 1 data is display in chart i.e. 68 how i display all data with names?