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In some cases specially for AJAX projects Asp.net C# VB.Net developers need to check user internet connection before attempting to connect to remote server. Also another important usage is for dashboard where after certain time interval you may need to know does the user connected with the network or not. Here in this article i will describe how one can find user internet connectivity using asp.net C# server side code.
The strategy is to start download a page from server. If you can download means you are connected to the internet otherwise not. Here i am using Google page but you can use any simple page for better performance. Look at the below code:
WebClient workstation = new WebClient();
byte[] data = null;
try
{
data = workstation.DownloadData("http://www.google.com");
}
catch (Exception ex)
{
}
if (data != null && data.Length > 0)
lblCaption.Text="You are connected.";
else
lblCaption.Text="You are not connected.";
To complete an example first add a page in your project. Then write the below Markup Code:<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Internet_Connectivity.aspx.cs" Inherits="Internet_Connectivity" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>How to check user internet connection</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label runat="server" ID="lblCaption" Font-Bold="true" ForeColor="DarkBlue">To test your connection click below</asp:Label>
<br />
<br />
<asp:Button runat="server" ID="cmdCHeck" Text="Check Connectivity" OnClick="cmdCHeck_Click" />
</div>
</form>
</body>
</html>
Under code behind the complete code is given below:using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;
public partial class Internet_Connectivity : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void cmdCHeck_Click(object sender, EventArgs e)
{
WebClient workstation = new WebClient();
byte[] data = null;
try
{
data = workstation.DownloadData("http://www.google.com");
}
catch (Exception ex)
{
}
if (data != null && data.Length > 0)
lblCaption.Text="You are connected.";
else
lblCaption.Text="You are not connected.";
}
}
Don't forget to add System.Net namespace into your page.The output will be:
Hope now you can check whether user connected to the internet or not.
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