O iş öyle olmaz, veri çektiği yere erişmek lazım.
Konya için istedin Konya namaz vakitleri için kodlar.

VB.net olarak :

Public Class WebForm1
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim request = DirectCast(Net.WebRequest.Create("http://www.diyanet.gov.tr/PrayerTime/PrayerTimesSet"), Net.HttpWebRequest)

'burada yer alan değerleri şehre göre düzenlemek lazım
        Dim data = Encoding.ASCII.GetBytes("{countryName: ""2"", stateName: ""552"", name: ""9676""}")

        request.Method = "POST"
        request.ContentType = "application/json; charset=UTF-8"
        request.ContentLength = data.Length
        request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0"

        Using stream = request.GetRequestStream()
            stream.Write(data, 0, data.Length)
        End Using
        Dim cevap = DirectCast(request.GetResponse(), Net.HttpWebResponse)
        Dim cevapString = New IO.StreamReader(cevap.GetResponseStream()).ReadToEnd()
        Dim jsons = Newtonsoft.Json.JsonConvert.DeserializeObject(Of VakitElemanlari)(cevapString)

        Response.Write("Aksam : " & jsons.Aksam)
        Response.Write("<br>")
        Response.Write("Yatsı :" & jsons.Yatsi)
    End Sub

End Class

Public Class VakitElemanlari
    Public Property Imsak As String
    Public Property Gunes As String
    Public Property Ogle As String
    Public Property Ikindi As String
    Public Property Aksam As String
    Public Property Yatsi As String
    Public Property NextImsak As String
    Public Property MoonSrc As String
    Public Property HicriTarih As String
    Public Property MiladiTarih As String
    Public Property RumiTarih As String
    Public Property Enlem As String
    Public Property KibleAcisi As String
    Public Property UlkeAdi As String
    Public Property SehirAdi As String
    Public Property KibleSaati As String
    Public Property GunesBatis As String
    Public Property GunesDogus As String
    Public Property ItemId As String
End Class

c# olarak :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            dynamic request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create("http://www.diyanet.gov.tr/PrayerTime/PrayerTimesSet");

            dynamic data = System.Text.Encoding.ASCII.GetBytes("{countryName: \"2\", stateName: \"552\", name: \"9676\"}");

            request.Method = "POST";
            request.ContentType = "application/json; charset=UTF-8";
            request.ContentLength = data.Length;
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0";

            using (System.IO.Stream stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }
            dynamic cevap = (System.Net.HttpWebResponse)request.GetResponse();
            dynamic cevapString = new System.IO.StreamReader(cevap.GetResponseStream()).ReadToEnd();
            dynamic jsons = Newtonsoft.Json.JsonConvert.DeserializeObject<VakitElemanlari>(cevapString);

            Response.Write("Aksam : " + jsons.Aksam);
            Response.Write("<br>");
            Response.Write("Yatsı :" + jsons.Yatsi);
        }
    }

public class VakitElemanlari
{
    public string Imsak { get; set; }
    public string Gunes { get; set; }
    public string Ogle { get; set; }
    public string Ikindi { get; set; }
    public string Aksam { get; set; }
    public string Yatsi { get; set; }
    public string NextImsak { get; set; }
    public string MoonSrc { get; set; }
    public string HicriTarih { get; set; }
    public string MiladiTarih { get; set; }
    public string RumiTarih { get; set; }
    public string Enlem { get; set; }
    public string KibleAcisi { get; set; }
    public string UlkeAdi { get; set; }
    public string SehirAdi { get; set; }
    public string KibleSaati { get; set; }
    public string GunesBatis { get; set; }
    public string GunesDogus { get; set; }
    public string ItemId { get; set; }
}