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Tip of the Day
Home » Tip Bank » .NET » C#
Language: .NET
Expertise: Beginner
Nov 9, 2016

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Detect Internet Connection in C#

There are numerous ways to find out whether or not there is an internet connection present. One of the quickest ways is to use the InternetGetConnectedState API. Here is how to use it:

Add the necessary namespace: using System.Runtime.InteropServices;

Declare the API:

//Creating the extern function???
        [DllImport("wininet.dll")]
        private extern static bool InternetGetConnectedState( out int Description, int ReservedValue ) ; 

Create a function that makes use of the API:

public static bool AmIConnected( )
        {
            try
            {
                int ConnDesc;
                MessageBox.Show("Connected");
                return InternetGetConnectedState(out ConnDesc, 0);
            }
            catch
            {
                return false;
            }

        }

Use the function:

private void button1_Click(object sender, EventArgs e)
        {
            AmIConnected();
        }
Hannes du Preez
 
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