Not able to display multiple markers from database

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ASP.NET

Hi Everyone,

I am unable to display multiple markers due to this error i.e;
Index and length must refer to a location within the string.
Parameter name: length

Source code:

protected void Page_Load(object sender, EventArgs e)
    {
        string markers = GetMarkers();
        Literal1.Text = @"
     <script type='text/javascript'>
     function initialize() {
 
     var mapOptions = {
     center: new google.maps.LatLng(28.3213, 77.5435),
     zoom: 2,
     mapTypeId: google.maps.MapTypeId.ROADMAP
     };
 
     var myMap = new google.maps.Map(document.getElementById('mapArea'),
     mapOptions);"
        + markers +
        @"}
     </script>";
    }


    protected string GetMarkers()
    {
        string markers = "";
        using (SqlConnection con = new
        SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["HostelConnectionString"].ConnectionString))
        {
            SqlCommand cmd = new SqlCommand("select VillageNm,lattitude,longitude,HostelName,DistrictCd,TalukCd,Hostel_Coordinates from FinYearHostelDetails  left join  Hostelinformation  on FinYearHostelDetails.Hostelcd=Hostelinformation.Hostelcd", con);
            con.Open();
            SqlDataReader reader = cmd.ExecuteReader();
            int i = 0;

            while (reader.Read())
            {
                i++;

                markers +=
                @"var marker" + i.ToString() + @" = new google.maps.Marker({
              position: new google.maps.LatLng(" + ConvertDegree(reader["Lattitude"].ToString()) + ", " +
                ConvertDegree(reader["Longitude"].ToString()) + ")," +
                @"map: myMap,
              title:'" + reader["HostelName"].ToString() + "'});";

       

      


            }
        }
        return markers;
    }

    
    public double ConvertDegree(string  input)
    {

        double sd = 0.0;
        double min = 0.0;
        double sec = 0.0;
        double deg = 0.0;
        string direction = input.Substring(0, 1);
        string sign = "";
        if ((direction.ToUpper() == "S") || (direction.ToUpper() == "W"))
        {
            sign = "-";
        }

        string[] arr = input.Split(new char[] { ' ' });
        min = Convert.ToDouble(arr[2]);
        string[] arr1 = arr[3].Split(new char[] { '.' });
        sec = Convert.ToDouble(arr1[0]);
        deg = Convert.ToDouble(arr[1]);
        min = min / ((double)60);
        sec = sec / ((double)3600);
        sd = deg + min + sec;
        if (!(string.IsNullOrEmpty(sign)))
        {
            sd = sd * (-1);
        }
        sd = Math.Round(sd, 6);
        string sdnew = Convert.ToString(sd);
        string sdnew1 = "";
        sdnew1 = string.Format("{0:0.000000}", sd);

        double manu = Convert.ToDouble(sdnew1.ToString());
        return manu;
        
        
    }

Solution please !