How Can I Efficiently Check for Internet Connectivity in .NET Applications?

High-Performance Internet Connectivity Testing in .NET Applications

The Challenge:

Determining internet connectivity quickly and reliably within .NET applications, especially in regions with potential website restrictions (e.g., Iran, China), presents a significant challenge.

The Solution:

This optimized code snippet provides a fast and efficient method for verifying internet access:

<code class="language-csharp">public static bool CheckForInternetConnection(int timeoutMs = 10000, string url = null)
{
    try
    {
        // Selects a suitable URL based on the system's UI culture.
        url = url ?? CultureInfo.InstalledUICulture.Name switch
        {
            var n when n.StartsWith("fa") => "http://www.aparat.com", // Iran
            var n when n.StartsWith("zh") => "http://www.baidu.com", // China
            _ => "http://www.gstatic.com/generate_204"
        };

        var request = (HttpWebRequest)WebRequest.Create(url);
        request.KeepAlive = false;
        request.Timeout = timeoutMs;
        using (var response = (HttpWebResponse)request.GetResponse())
            return true; // Success: Internet connection established.
    }
    catch (Exception)
    {
        return false; // Failure: No internet connection.
    }
}</code>

This approach ensures robust internet connectivity checks in your .NET applications, even under geographically diverse network conditions. The use of different default URLs helps to overcome regional restrictions.

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