--- title: "How to Set Up Proxy Servers in C#" slug: proxy-with-c-sharp date: 2024-02-28T07:34:59+00:00 modified: 2026-04-27T08:41:21+00:00 permalink: https://brightdata.com/blog/how-tos/proxy-with-c-sharp type: blog --- [ Blog ](https://brightdata.com/blog "Blog") / [How Tos](https://brightdata.com/blog/how-tos) [How Tos](https://brightdata.com/blog/how-tos) # How to Set Up Proxy Servers in C# Learn to implement proxies in C# for web scraping, enhancing privacy and efficiency in data collection projects with Visual Studio and .NET 7. 17 min read [ ](https://brightdata.com/blog/authors/abnoan-muniz) [Abnoan Muniz February 28, 2024 ](https://brightdata.com/blog/authors/abnoan-muniz) ![Configuring Proxy Settings in C# Code](https://media.brightdata.com/2024/02/Setting-Proxy-in-C.svg) When you access the internet directly, websites can easily trace your requests to your IP address. This exposure can lead to targeted advertising and online tracking and potentially compromise your digital identity. That’s where proxies come in. They act as intermediaries between your computer and the internet and help you protect your digital identity. When you use a proxy server, it sends requests to websites on your behalf using the proxy’s own IP address. When it comes to web scraping, proxies can help you circumvent IP bans, avoid geoblocking, and protect your identity. In this article, you’ll learn how to implement proxies in C# for all your web scraping projects. ## Prerequisites Before you begin this tutorial, make sure you have the following: - Visual Studio 2022 - .NET 7 or newer - HtmlAgilityPack The examples in this article use a separate .NET console application. To create your own, you can use one of the following guides: - [Create a .NET console application using Visual Studio Code](https://learn.microsoft.com/en-us/dotnet/core/tutorials/with-visual-studio-code?pivots=dotnet-7-0) - [Create a .NET console application using Visual Studio](https://learn.microsoft.com/en-us/dotnet/core/tutorials/with-visual-studio?pivots=dotnet-7-0) To get started, you need to create two console applications, `WebScrapApp` and `WebScrapBrightData`: For web scraping, particularly if you’re dealing with HTML content, you need specific tools like the HtmlAgilityPack. This library simplifies HTML parsing and manipulation, making extracting data from web pages easier. In both projects (*ie* `WebScrapApp` and `WebScrapBrightData`), add the NuGet package HtmlAgilityPack by right-clicking on the **NuGet** folder and then **Manage NuGet Packages**. When a pop-up window appears, search for “HtmlAgilityPack” and install it for both projects: To run any of the following projects, you need to navigate to the project directory in the command prompt and use `cd pathtoyourproject` followed by `dotnet run`. Alternatively, you can press **F5** to build and run the project in Visual Studio. Both methods compile and execute your application, displaying the output accordingly. > **Note:** If you don’t have Visual Studio 2022, you can use any alternative IDE that supports .NET 7. Just be aware that some steps in this guide may vary. ## How to Set Up a Local Proxy When it comes to web scraping, the first thing you need to do is to use a proxy server. This tutorial uses the open source proxy [mitmproxy](https://mitmproxy.org/). To start, navigate to the [mitmproxy downloads](https://mitmproxy.org/downloads/#10.1.6/), download version 10.1.6, and select the correct version for your operating system. For additional help, check out the official [mitmproxy installation guide](https://docs.mitmproxy.org/stable/overview-installation/). Once mitmproxy is installed, open your terminal and launch mitmproxy using the following command: ```none mitmproxy ``` You should see a window in your shell or terminal that looks like this: To test the proxy, open another terminal or shell and run the following curl request: ```none curl --proxy http://localhost:8080 "http://wttr.in/Dunedin?0" ``` Your output should look like this: ```none Weather report: Dunedin Cloudy .--. +11(9) °C .-( ). ↙ 15 km/h (___.__)__) 10 km 0.0 mm ``` In the mitmproxy window, you should see that it intercepted the call through the local proxy: ## Web Scraping in C# In the following section, you’ll set up the C# console application `WebScrapApp` for web scraping. This application utilizes the proxy server and includes proxy rotation for enhanced efficiency. ### Create an HttpClient The `ProxyHttpClient` class is designed to configure an `HttpClient` instance to route requests via a specified proxy server. Under your `WebScrapApp` project, create a new class file named `ProxyHttpClient.cs` and add the following code: ```none namespace WebScrapApp { public class ProxyHttpClient { public static HttpClient CreateClient(string proxyUrl) { var httpClientHandler = new HttpClientHandler() { Proxy = new WebProxy(proxyUrl), UseProxy = true }; return new HttpClient(httpClientHandler); } } } ``` ### Implement Proxy Rotation To implement proxy rotation, create a `ProxyRotator.cs` class file under your `WebScrapApp` solution: ```none namespace WebScrapApp { public class ProxyRotator { private List _validProxies = new List(); private readonly Random _random = new(); public ProxyRotator(string[] proxies, bool isLocal) { if (isLocal) { _validProxies.Add("http://localhost:8080/"); } else { _validProxies = ProxyChecker.GetWorkingProxies(proxies.ToList()).Result; } if (_validProxies.Count == 0) throw new InvalidOperationException(); } public HttpClient ScrapeDataWithRandomProxy(string url) { if (_validProxies.Count == 0) throw new InvalidOperationException(); var proxyUrl = _validProxies[_random.Next(_validProxies.Count)]; return ProxyHttpClient.CreateClient(proxyUrl); } } } ``` This class manages a list of proxies, providing a method to select a proxy for each web request randomly. This randomization is key to reducing the risk of detection and potential IP bans during web scraping. When the `isLocal` is set to `True`, it takes the local proxy from mitmproxy. If it’s set to `False`, it takes the public IPs of the proxies. The `ProxyChecker` is used to validate the list of proxy servers. Next, create a new class file named `ProxyChecker.cs` and add the following code: ```none using WebScrapApp; namespace WebScrapApp { public class ProxyChecker { private static SemaphoreSlim consoleSemaphore = new SemaphoreSlim(1, 1); private static int currentProxyNumber = 0; public static async Task> GetWorkingProxies(List proxies) { var tasks = new List>>(); foreach (var proxyUrl in proxies) { tasks.Add(CheckProxy(proxyUrl, proxies.Count)); } var results = await Task.WhenAll(tasks); var workingProxies = new List(); foreach (var result in results) { if (result.Item2) { workingProxies.Add(result.Item1); } } return workingProxies; } private static async Task> CheckProxy(string proxyUrl, int totalProxies) { var client = ProxyHttpClient.CreateClient(proxyUrl); bool isWorking = await IsProxyWorking(client); await consoleSemaphore.WaitAsync(); try { currentProxyNumber++; Console.WriteLine($"Proxy: {currentProxyNumber} de {totalProxies}"); } finally { consoleSemaphore.Release(); } return new Tuple(proxyUrl, isWorking); } private static async Task IsProxyWorking(HttpClient client) { try { var testUrl = "http://www.google.com"; var response = await client.GetAsync(testUrl); return response.IsSuccessStatusCode; } catch { return false; } } } } ``` This code defines the `ProxyChecker` for validating a list of proxy servers. When you use the `GetWorkingProxies` method with a list of proxy URLs, it checks each proxy’s status asynchronously via the `CheckProxy` method, collecting operational proxies in a `workingProxies` list. Within `CheckProxy`, you establish an `HttpClient` with the proxy URL, make a test request to [http://www.google.com](https://www.google.com/), and record progress safely using a semaphore. The `IsProxyWorking` method confirms the proxy’s functionality by examining the response status code, returning `true` for operational proxies. This class aids in identifying working proxies from a given list. ### Scrape Web Data To scrape data, create a new `WebScraper.cs` class file under your `WebScrapApp` solution and add the following code: ```none using HtmlAgilityPack; namespace WebScrapApp { public class WebScraper { public static async Task ScrapeData(ProxyRotator proxyRotator, string url) { try { var client = proxyRotator.ScrapeDataWithRandomProxy(url); // Use HttpClient to make an asynchronous GET request var response = await client.GetAsync(url); var content = await response.Content.ReadAsStringAsync(); // Load the HTML content into an HtmlDocument HtmlDocument doc = new(); doc.LoadHtml(content); // Use XPath to find all tags that are direct children of
  • ,

    , or var nodes = doc.DocumentNode.SelectNodes("//li/a[@href] | //p/a[@href] | //td/a[@href]"); if (nodes != null) { foreach (var node in nodes) { string hrefValue = node.GetAttributeValue("href", string.Empty); string title = node.InnerText; // This gets the text content of the tag, which is usually the title // Since Wikipedia URLs are relative, we need to convert them to absolute Uri baseUri = new(url); Uri fullUri = new(baseUri, hrefValue); Console.WriteLine($"Title: {title}, Link: {fullUri.AbsoluteUri}"); // You can process each title and link as required } } else { Console.WriteLine("No article links found on the page."); } // Add additional logic for other data extraction as needed } catch (Exception ex) { throw ex; } } } } ``` In this code, you define the `WebScraper`, which encapsulates web scraping functionality. When you call the `ScrapeData` method, you provide it with a `ProxyRotator` instance and a target URL. Inside this method, you use an `HttpClient` to make an asynchronous GET request to the URL, retrieve the HTML content, and parse it using the HtmlAgilityPack library. Then you employ XPath queries to locate and extract links and corresponding titles from specific HTML elements. If any article links are found, you print their titles and absolute URLs; otherwise, you print a message indicating no links were found. After configuring the proxy rotation mechanism and implementing web scraping functionality, you need to seamlessly integrate these components into the application’s primary entry point, which is typically found in `Program.cs`. This integration enables the application to execute web scraping tasks while utilizing rotating proxies with a specific focus on scraping data from the Wikipedia home page: ```none namespace WebScrapApp { public class Program { static async Task Main(string[] args) { string[] proxies = { "http://162.223.89.84:80", "http://203.80.189.33:8080", "http://94.45.74.60:8080", "http://162.248.225.8:80", "http://167.71.5.83:3128" }; var proxyRotator = new ProxyRotator(proxies, false); string urlToScrape = "https://www.wikipedia.org/"; await WebScraper.ScrapeData(proxyRotator, urlToScrape); } } } ``` In this code, the application initializes a list of proxy URLs, creates a `ProxyRotator` instance, specifies the target URL for scraping (in this case, `https://www.wikipedia.org/`), and invokes the `WebScraper.ScrapeData` method to start the web scraping process. The application uses a list of free proxy IPs, specified in the proxies array, to route web scraping requests, masking the trustworthy source and minimizing the risk of being blocked by the Wikipedia server. The `ScrapeData` method is set to scrape the Wikipedia home page to extract and display article titles and links in the console. The `ProxyRotator` class handles the rotation of these proxies, enhancing the discreteness of the scraping. ### Run the WebScrapApp To run the `WebScrapApp`, open a new terminal or shell under the root directory of your `WebScrapApp` application and run the following commands: ```none dotnet build dotnet run ``` Your output should look like this: ```none …output omitted… Title: Latina, Link: https://la.wikipedia.org/ Title: Latviešu, Link: https://lv.wikipedia.org/ Title: Lietuvių, Link: https://lt.wikipedia.org/ Title: Magyar, Link: https://hu.wikipedia.org/ Title: Македонски, Link: https://mk.wikipedia.org/ Title: Bahasa Melayu, Link: https://ms.wikipedia.org/ Title: Bahaso Minangkabau, Link: https://min.wikipedia.org/ Title: bokmål, Link: https://no.wikipedia.org/ Title: nynorsk, Link: https://nn.wikipedia.org/ Title: Oʻzbekcha / Ўзбекча, Link: https://uz.wikipedia.org/ Title: Қазақша / Qazaqşa / قازاقشا, Link: https://kk.wikipedia.org/ Title: Română, Link: https://ro.wikipedia.org/ Title: Simple English, Link: https://simple.wikipedia.org/ Title: Slovenčina, Link: https://sk.wikipedia.org/ Title: Slovenščina, Link: https://sl.wikipedia.org/ Title: Српски / Srpski, Link: https://sr.wikipedia.org/ Title: Srpskohrvatski / Српскохрватски, Link: https://sh.wikipedia.org/ Title: Suomi, Link: https://fi.wikipedia.org/ Title: தமிழ், Link: https://ta.wikipedia.org/ …output omitted… ``` When the `ScrapeData` method of the `WebScraper` class is invoked, it performs the data extraction from Wikipedia, resulting in a console display of article titles and their corresponding links. This code uses publicly available proxies, and each time you run the application, it chooses one of the listed IP addresses as a proxy. To test with the local proxy from mitmproxy, update the `ProxyRotator` method in the `Program` file with the following: ```none var proxyRotator = new ProxyRotator(proxies, true) string urlToScrape = "http://toscrape.com/"; ``` By setting the value to `true`, it takes the local proxy server that is running on your localhost port 8080 (*ie* the mitmproxy server). To simplify the configuration process when you set up a certificate on your machine, change the URL to `http://toscrape.com/`. Verify that the mitmproxy server is running; then run the same commands again: ```none dotnet build dotnet run ``` Your output should look like this: ```none …output omitted… Title: fictional bookstore, Link: http://books.toscrape.com/ Title: books.toscrape.com, Link: http://books.toscrape.com/ Title: A website, Link: http://quotes.toscrape.com/ Title: Default, Link: http://quotes.toscrape.com/ Title: Scroll, Link: http://quotes.toscrape.com/scroll Title: JavaScript, Link: http://quotes.toscrape.com/js Title: Delayed, Link: http://quotes.toscrape.com/js-delayed Title: Tableful, Link: http://quotes.toscrape.com/tableful Title: Login, Link: http://quotes.toscrape.com/login Title: ViewState, Link: http://quotes.toscrape.com/search.aspx Title: Random, Link: http://quotes.toscrape.com/random …output omitted… ``` If you check the mitmproxy window from your terminal or shell, you should see that it intercepted the call: As you can see, setting up a local proxy or switching between various proxies can be a complex and time-consuming task. Thankfully, tools like Bright Data can help. In the following section, you’ll learn how to use the Bright Data proxy server to simplify the scraping process. ## Bright Data Proxy Bright Data offers an [network of proxy services](/proxy-types) available [across 195 locations](/locations). This network integrates the [Bright Data proxy rotation feature](/solutions/rotating-proxies), systematically alternating between servers to enhance web scraping effectiveness and security. Using this rotating proxy system diminishes the risk of IP bans or blocks typically encountered during web scraping tasks. Each request uses a different proxy, concealing the scraper’s identity and making it challenging for websites to detect and limit access. This approach enhances data collection reliability, ensuring heightened anonymity and security. The Bright Data platform is designed for ease of use and straightforward setup, making it a perfect fit for [C# web scraping projects](/blog/how-tos/web-scraping-with-c-sharp), which you’ll see in the next section. ### Create a Residential Proxy Before you can use a Bright Data proxy in your project, you need to set up an account. To do so, visit the [Bright Data website](/) and sign up for a free trial. Once you’ve set up your account, sign into it and click on the location icon on the left to navigate to **Proxies & Scraping Infrastructure**. Then click on **Add** and choose **[Residential Proxies](/proxy-types/residential-proxies)**: Keep the default names and click on **Add** again to create a residential proxy: Once the proxy is created, you should see the credentials, including a host, port, username, and password. Save these credentials in a safe place as you’ll need them later: Navigate to your **WebScrapingBrightData** project from your IDE or terminal/shell. Then create a `BrightDataProxyConfigurator.cs` class file and add the following code: ```none using System.Net; namespace WebScrapBrightData { public class BrightDataProxyConfigurator { public static HttpClient ConfigureHttpClient(string proxyHost, string proxyUsername, string proxyPassword) { var proxy = new WebProxy(proxyHost) { Credentials = new NetworkCredential(proxyUsername, proxyPassword) }; var httpClientHandler = new HttpClientHandler() { Proxy = proxy, UseProxy = true }; var client = new HttpClient(httpClientHandler); client.DefaultRequestHeaders.Add("User-Agent", "YourUserAgent"); client.DefaultRequestHeaders.Add("Accept", "application/json"); client.DefaultRequestHeaders.TryAddWithoutValidation("Proxy-Authorization", Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes($"{proxyUsername}:{proxyPassword}"))); return client; } } } ``` In this code, you define a `BrightDataProxyConfigurator` class, which includes the `ConfigureHttpClient` method. When called, this method configures and returns an `HttpClient` that is set up to use a proxy server. You achieve this by creating a proxy URL using the provided `username`, `password`, `host`, and `port`, and then configuring an `HttpClientHandler` with this proxy. The method ultimately returns an `HttpClient` instance that routes all its requests through the specified proxy. Next, create the `WebContentScraper.cs` class file under the `WebScrapingBrightData` project and add the following code: ```none using HtmlAgilityPack; namespace WebScrapBrightData { public class WebContentScraper { public static async Task ScrapeContent(string url, HttpClient client) { var response = await client.GetAsync(url); var content = await response.Content.ReadAsStringAsync(); HtmlDocument doc = new(); doc.LoadHtml(content); var nodes = doc.DocumentNode.SelectNodes("//li/a[@href] | //p/a[@href] | //td/a[@href]"); if (nodes != null) { foreach (var node in nodes) { string hrefValue = node.GetAttributeValue("href", string.Empty); string title = node.InnerText; Uri baseUri = new(url); Uri fullUri = new(baseUri, hrefValue); Console.WriteLine($"Title: {title}, Link: {fullUri.AbsoluteUri}"); } } else { Console.WriteLine("No article links found on the page."); } } } } ``` This code defines a `WebContentScraper` class with a static async method, `ScrapeContent`. This method takes a URL and an HttpClient, fetches the web page’s content, parses it as HTML, and extracts links from specific HTML elements (list items, paragraphs, and table cells). It then prints the titles and absolute URIs of these links to the console. #### Program Class Now, scrape Wikipedia again and see how Bright Data improves access and anonymity. Update the `Program.cs` class file with the following code: ```none namespace WebScrapBrightData { public class Program { public static async Task Main(string[] args) { // Bright Data Proxy Configuration string host = "your_brightdata_proxy_host"; string username = "your_brightdata_proxy_username"; string password = "your_brightdata_proxy_password"; var client = BrightDataProxyConfigurator.ConfigureHttpClient(host, username, password); // Scrape content from the target URL string urlToScrape = "https://www.wikipedia.org/"; await WebContentScraper.ScrapeContent(urlToScrape, client); } } } ``` > **Note:** Make sure you replace the Bright Data proxy credentials with the ones you saved previously. Next, to test and run your application, open your shell or terminal from the root directory of your `WebScrapBrightData` project and run the following command: ```none dotnet build dotnet run ``` You should get the same output as before when you utilized public proxies: ```none …output omitted… Title: Latina, Link: https://la.wikipedia.org/ Title: Latviešu, Link: https://lv.wikipedia.org/ Title: Lietuvių, Link: https://lt.wikipedia.org/ Title: Magyar, Link: https://hu.wikipedia.org/ Title: Македонски, Link: https://mk.wikipedia.org/ Title: Bahasa Melayu, Link: https://ms.wikipedia.org/ Title: Bahaso Minangkabau, Link: https://min.wikipedia.org/ Title: bokmål, Link: https://no.wikipedia.org/ Title: nynorsk, Link: https://nn.wikipedia.org/ Title: Oʻzbekcha / Ўзбекча, Link: https://uz.wikipedia.org/ Title: Қазақша / Qazaqşa / قازاقشا, Link: https://kk.wikipedia.org/ Title: Română, Link: https://ro.wikipedia.org/ Title: Simple English, Link: https://simple.wikipedia.org/ Title: Slovenčina, Link: https://sk.wikipedia.org/ Title: Slovenščina, Link: https://sl.wikipedia.org/ Title: Српски / Srpski, Link: https://sr.wikipedia.org/ Title: Srpskohrvatski / Српскохрватски, Link: https://sh.wikipedia.org/ Title: Suomi, Link: https://fi.wikipedia.org/ Title: தமிழ், Link: https://ta.wikipedia.org/ …output omitted… ``` The program uses the Bright Data proxy to scrape the Wikipedia home page and display the extracted titles and links in the console. This showcases the effectiveness and ease of integrating the Bright Data proxy into a C# web scraping project for discreet and robust data extraction. If you want to visualize the effect of using a Bright Data proxy, you can try sending a GET request to . This website will return the location and other network-related details of the client currently trying to access the website. If you want to try this yourself, open up the link in a new browser tab. You should see the details of your network which are publicly visible. To try it with a Bright Data proxy, update the code in `WebContentScraper.cs` to match the following: ```none using HtmlAgilityPack; public class WebContentScraper { public static async Task ScrapeContent(string url, HttpClient client) { var response = await client.GetAsync(url); var content = await response.Content.ReadAsStringAsync(); HtmlDocument doc = new(); doc.LoadHtml(content); Console.Write(content); } } ``` Then, update the `urlToScrape` variable in the `Program.cs` file to scrape the website: ```none string urlToScrape = "http://lumtest.com/myip.json"; ``` Now, try running the app again. You should see an output like this in your terminal: ```none {"ip":"79.221.123.68","country":"DE","asn":{"asnum":3320,"org_name":"Deutsche Telekom AG"},"geo":{"city":"Koenigs Wusterhausen","region":"BB","region_name":"Brandenburg","postal_code":"15711","latitude":52.3014,"longitude":13.633,"tz":"Europe/Berlin","lum_city":"koenigswusterhausen","lum_region":"bb"}} ``` This confirms that the request is now being proxied through one of Bright Data’s proxy servers. ## Conclusion In this article, you learned how to use proxy servers with C# for web scraping. Although local proxy servers can be useful in some scenarios, they often present limitations for web scraping projects. Thankfully, [proxy servers](/proxy-types/proxy-servers) can help. With its extensive global network and a diverse range of proxy options, including [residential](/proxy-types/residential-proxies), [ISP](/proxy-types/isp-proxies), [datacenter](/proxy-types/datacenter-proxies), and [mobile proxies](/proxy-types), Bright Data guarantees a high degree of flexibility and reliability. Notably, the proxy rotation feature is invaluable for large-scale scraping tasks, helping to maintain anonymity and reduce the risk of IP bans. As you continue your web scraping journey, consider using Bright Data solutions as a powerful and scalable way to gather data efficiently while adhering to best practices in web scraping. All the code for this tutorial is available in this [GitHub repository](https://github.com/luminati-io/proxy-csharp). Contact usStart free trial No credit card required Abnoan Muniz [ View all articles ](https://brightdata.com/blog/authors/abnoan-muniz) Table of Contents Dedicated Scraper APIs & No-Code Scrapers Over 1000 scrapers for all popular domains. Simplify your web scraping. [See pricing](/pricing/web-scraper "See pricing") Just want data? Skip scraping. Hundreds of ready-to-use datasets from all popular domains. 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