This paper examines the great application of C# language in creating a web browser ‘QvsQ’ using CefSharp and VPN. The performance of the application is connected to the Internet, improved to display the content of all websites more quickly, not stored the private information of the user and has most of the function of the normal web browser. | THE VPN BROWSER USING C SVTH Trần Xuân Quyết GVHD THS. Luyện Thu Trang Tóm tắt - Bài báo này xem xét ứng dụng của ngôn ngữ C trong việc tạo trình duyệt web QvsQ sử dụng CefSharp và VPN. Hiệu suất của ứng dụng được kết nối Internet được cải thiện để hiển thị nội dung của tất cả các trang web nhanh hơn không bị lưu trữ thông tin riêng tư của người dùng và có hầu hết các chức năng của trình duyệt web thông thường. Abstract - This paper examines the great application of C language in creating a web browser QvsQ using CefSharp and VPN. The performance of the application is connected to the Internet improved to display the content of all websites more quickly not stored the private information of the user and has most of the function of the normal web browser. Keywords QQ-Browser the web browser .Net Framework C language CefSharp winform VPN and sqlite. I. Introduction Nowadays browsers like Google Chrome or FireFox manage Ram that way to offer better stability and faster speeds. But they still use a lot of RAM. At least in many cases it appears to be using more RAM than other browsers. The main reason for running each process separately is stability. When they use too much memory it limits the amount available for other programs. It limits the amount available for other programs. When it comes down to it for example Firefox of usage is a problem if it slows your computer down be that the browser or your entire system. However QQ-Browser is the fast open source C web browser there is Slightly faster than Google Chrome or Firefox when rendering web pages due to lightweight CEF render and save the memory and these do not gather private information of the user and the routine when the user uses the Internet as well. Moreover with the explosion of the internet people are going through a revolution of information technology which brings us many benefits such as the ability to access huge knowledge resources as well as networkization all activities of life such as banking .