Generate MultiSerie Line chart without Database using C# in ASP.Net

I refer below Article and made one sample where data is hardcode in Datatable.

ASP.Net AJAX Line Chart Control Multiple Series: Populate from Database example

Refer below sample code for your reference and implement it as per your code logic. for y axix you must need to assign an numeric value else your chart functionality will never work.

HTML

<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</cc1:ToolkitScriptManager> 
<cc1:LineChart ID="LineChart1" runat="server" ChartHeight="300" ChartWidth="450"
    ChartType="Basic" ChartTitleColor="#0E426C" Visible="false" CategoryAxisLineColor="#D08AD9"
    ValueAxisLineColor="#D08AD9" BaseLineColor="#A156AB" >
</cc1:LineChart>

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] {  new DataColumn("Employee", typeof(string))
                                            ,new DataColumn("Days", typeof(string)) 
                                            ,new DataColumn("CameOnTime", typeof(decimal)) });
        dt.Rows.Add("Jon", "Mon", "10");
        dt.Rows.Add("Jon", "Tue", "20");
        dt.Rows.Add("Jon", "Wed", "30");
        dt.Rows.Add("Jon", "Thu", "20");
        dt.Rows.Add("Jon", "Fri", "10");
        dt.Rows.Add("Jon", "Sat", "20");

        dt.Rows.Add("Mak", "Mon", "20");
        dt.Rows.Add("Mak", "Tue", "10");
        dt.Rows.Add("Mak", "Wed", "20");
        dt.Rows.Add("Mak", "Thu", "30");
        dt.Rows.Add("Mak", "Fri", "10");
        dt.Rows.Add("Mak", "Sat", "30");

        List<string> x = (from p in dt.AsEnumerable()
                            select p.Field<string>("Days")).Distinct().ToList();


        var Employee = (from p in dt.AsEnumerable()
                        select p.Field<string>("Employee")).Distinct().ToList();
        foreach (var emp in Employee)
        {
            List<decimal> totals = (from p in dt.AsEnumerable()
                                    where p.Field<string>("Employee") == emp
                                    select p.Field<decimal>("CameOnTime")).Cast<decimal>().ToList();
            LineChart1.Series.Add(new AjaxControlToolkit.LineChartSeries { Name = emp, Data = totals.ToArray() });
        }

        LineChart1.CategoriesAxis = string.Join(",", x.ToArray());
        LineChart1.ChartTitle = string.Format("Employee Come time Details");
        Label lbl = new Label();
        lbl.Text = "<b>On Time: 10 <br/> Grace Time 20  <br/> Late Time: 30</b>";
        LineChart1.Controls.Add(lbl);
        LineChart1.Visible = true;
    }
}

Screenshot