In this article I will explain how to encrypt and decrypt file such as Word (DOC, DOCX), Excel (XLS, XLSX), PDF, Text (TXT) documents or JPG, PNG or GIF Images using. How to use image in PDF document in ASP.NET with C# using iTextSharp In this article I’m going to explain how to use image in PDF document. Other articles related. Is the user selecting a file or a folder? Is the location on the server, or on his local computer? Are you trying to upload something, or download something, or just.Implementing Smart Card Authentication and Authorization With ASP. Implementing Smart Card Authentication with ASP. NETPage 1 of 2. 5 Copyright . Download File using Response WriteFile in ASP.NET: Today we show you how to download different type of files from folder location using c# in ASP.NET. You'll need to create the workbook, add more sheets if needed (defaults with three), and then fill out the cells. Top of the file: using Excel=Microsoft.Office. Montgomery. Implementing Smart Card Authentication with ASP. NETIn my previous article last October on. Smart Card Authentication with ASP. NET, I introduced thetopic of using Smart Cards to handle Authentication and Authorization with ASP. NET for non- Active Directory users. This is a more complete follow- up article now that I have done a bit moreresearch into the topic and now have a full working implementation that I’m happy with. In this implementation, the IIS Web Server is handling the basics of the Smart Cardauthentication, much like Windows authentication works. The goals of this project are to provide the following: 1. A tight interface to strongly typed objects that are Smart Card aware. Allow these typed objects to be available to the entire web application on every page request. Provide Role based authorization via the smart card through groups. This will require amechanism to associate a User’s smart card with an associated group. Some Caveats. If you do not need to apply role authorization through Principals then this methodology may bemore then you need. If specific requirements stipulate you need information on the Smart. Card/Client Certificate to display on the screen or track the Certificate Subject, simply using IISfor Authentication and the Http. Certificate property of the Context object(Context. Request. Client. Certificate ) will be sufficient. If you plan on doing Client Certificate Mapping to User Accounts on the OS or Domain, thismethodology is not necessary. If the reason is not immediately obvious to you, the short answeris that when using Certificate to AD Account mapping, IIS is taking the smart card and mapping itto a Windows Account – so in the end, IIS is using Windows Authentication. Once you havemapped an account from a smart card to a windows account, you can use Windows. Authentication in the Web. Config and the. Windows. Principal object for Authorization based on. Windows Groups. Background. In my original implementation of Smart Card authentication and authorization with ASP. NET, Iused Forms Authentication in combination with the. Request. Client. Certificate to automaticallyauthentication the user. Instead of having the user enter their credentials on the Forms Login. Page, this methodology still redirected them to the forms login page and the code behindautomatically resolved the. Request. Client. Certificate and authenticated the Client Certificate byresolving their account in the database. Next the code created the. Forms. Authentication. Ticket (which included the roles) as a cookie, and then redirected them back to the original page theywere requesting. Finally, the Principal was attached to the. Context. User object in. Application. For implementation details, see: How. To: Create Generic. Principal Objects with Forms Authenticationand. How To: Use Forms. Authentication with SQL Server 2. I combined and modified these methodologies for usewith the Smart Card. After having used Forms Authentication in the original version, here are some “lessons learned” Iwill share. The Forms Authentication approach ended up not being a very good approach forseveral reasons: 1. Forms Authentication relies on page redirects to handle authentication via a Login page. Thisadds unnecessary overhead since there is no reason for the browser to jump around viaredirects to retrieve the. Request. Client. Certificate . The certificate is immediately availableonce the user is authenticated via IIS. Forms Authentication relies on encrypted cookies to store the users’ authentication data inthe. Forms. Authentication. Ticket. User. Data property (which was the users’ roles are typically.
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