Since many applications (like Smart Clients) use the internet to send/ retrieve data, it's a good thing to check to make sure the user has access to the internet before making your call. This will prevent connection exceptions. The code below first checks to make sure the user even has a network connection, then tries to ping up to three web sites to see if the ping is successful (of course you can change the sites to your linking or add more). The good thing that this code does that most other code I saw when researching this, is that it does not rely on an exception to determine that an internet connection is not available. Therefor it's much faster!
C#
public bool GetIsInternetConnectionAvailable()
{
var success = false;
if (NetworkInterface.GetIsNetworkAvailable() == false)
{
return success;
}
string[] sitesList = { "www.google.com", "www.microsoft.com", "www.mycompany.com" };
try
{
using (var ping = new Ping())
{
foreach (var url in sitesList)
{
var reply = ping.Send(url, 300);
if (reply.Status == IPStatus.Success)
{
success = true;
break;
}
}
}
}
catch (Exception ex)
{
Trace.WriteLine(ex.Message);
}
return success;
}
VB.NET
Public Function GetIsInternetConnectionAvailable() As Boolean
Dim success = False
If My.Computer.Network.IsAvailable = False Then
Return success
End If
Dim sitesList As String() = {"www.google.com", "www.microsoft.com", "www.mycompany.com"}
Try
For Each url In sitesList
If My.Computer.Network.Ping(url, 300) Then
success = True
Exit For
End If
Next
Catch ex As Exception
Trace.WriteLine(ex.Message)
End Try
Return success
End Function
Tip By: David McCarter