Check Internet Connection in Asp.net using C#, VB.NET

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By: Suresh Dasari Dec 29, 2012

Introduction:

Here I will explain how to check internet connectivity of system in asp.net using C# and VB.NET.

Description:

In previous articles I explained Change the style of tooltip in jQuery, jQuery Countdown timer script example, jQuery Increase or Decrease font size of website, Redirect to another page after some time delay, jQuery slideUp slideDown toggle effects and many articles relating to JQuery and asp.net. Now I will explain how to check internet connectivity of system in asp.net using C# and VB.NET.

We can check internet connectivity of system by downloading data of one website from server for that write code like as shown below

<head>

<title>Check Internet Connection Availability using Asp.net</title>

</head>

<body>

<div>

<asp:Button runat="server" ID="btnCheck" Text="Check Internet Connectivity" OnClick="btnCheck_Click" />

<asp:Label runat="server" ID="lbltxt" />

</div>

</form>

</body>

</html>

Now in code behind add the following namespaces

C# Code

using System;

using System.Net;

After that write the following code in code behind

protected void btnCheck_Click(object sender, EventArgs e)

{

WebClient client = new WebClient();

byte[] datasize = null;

try

{

datasize = client.DownloadData("http://www.google.com");

}

catch (Exception ex)

{

}

if (datasize != null && datasize.Length > 0)

lbltxt.Text = "Internet Connection Available.";

else

lbltxt.Text = "Internet Connection Not Available.";

}

VB.NET Code

Imports System.Net

Partial Class VBCode

Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

End Sub

Protected Sub btnCheck_Click(ByVal sender As Object, ByVal e As EventArgs)

Dim client As New WebClient()

Dim datasize As Byte() = Nothing

Try

datasize = client.DownloadData("http://www.google.com")

Catch ex As Exception

End Try

If datasize IsNot Nothing AndAlso datasize.Length > 0 Then

lbltxt.Text = "Internet Connection Available."

Else

lbltxt.Text = "Internet Connection Not Available."

End If

End Sub

End Class

Demo

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2 comments :

Anonymous said...: nice article; December 30, 2012 at 9:14 PM
dissertation writing said...: Very clear explanation of issues is given and it is open to everyone.It contains true and fair information. Your website is very useful.; May 6, 2013 at 2:28 AM

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