In application like Messenger or Application that provides
automatic update need to check that user is connected to internet or not before
proceeding further.
so we need to check whether he is connected to internet or not we can check
that with use of WIN32 API.
we can use Win32
API Wininet.dll 'sInternetGetConnectedState()
method to check Internet Status
for working with Pinvoke we need to add name space
using System.Runtime.InteropServices;
now we need to write prototyping of the function like below
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState(outint connectionDescription, int reservedValue);
Now simply we can use this function to check internet connectivity
take one button and label on form In buttons's click even write
following code
private void btnCheckConnection_Click(objectsender, EventArgs e)
{
int Description=0;
bool isConnected
= InternetGetConnectedState(out Description,
0);
if (isConnected
== true)
{
label1.Text
= "User
is Connected to Internet ";
}
else
{
label1.Text
= "Disconnected";
}
}
Here is how complete code look like
-----------------------------------------------
public partial class Form1 : Form
{
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState(out int connectionDescription,int reservedValue);
public Form1()
{
InitializeComponent();
}
private void btnCheckConnection_Click(object sender, EventArgs e)
{
int Description=0;
bool isConnected
= InternetGetConnectedState(out Description,
0);
if (isConnected
== true)
{
label1.Text
= "User
is Connected to Internet ";
}
else
{
label1.Text
= "Disconnected";
}
}
}
Thank you.