Query from an internal network

Question

 
Dear,

I would like a query on a internal network tool about a internal url like "http://192.168.1.10:5000" and write the result in a RichTextBox or write it in a text-file.
I have mak a sample, but it does not run.
I get in the sample an exeption on line 26. "WebResponse response = request.GetResponse();"

I don't no where ist the problem?
Please, could help me anyone?

 

I have a form with

- textBox1.Text = http://192.168.1.10:5000

- richTextBox

and a button

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace Http_Webabfrage_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string URL = textBox1.Text;
            WebRequest request = WebRequest.Create(URL);
            WebResponse response = request.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream());
            string str = reader.ReadLine();
            while (str != null)
            {

                richTextBox1.Text = str;
            }
        }
    }
}