C# KB: WebForms Coding Tasks Topic

To restrict what an ASP.NET application can and cannot access and to provide an additional level of application isolation in a hosted environment, access security can be used. You do this by configuring the element in the machine-level Web.config file located in the following folder: %windir%\Microsoft.NET\Framework\{version}\CONFIG.

Using this quickie code snippet, you can attach an ASP:Gridview  to an external RSS Feed.

All you need to accomplish this is the URL of a usable feed.

Demonstrates the code required to retreive and store a file uploaded via an ASP FileUpload object.  Assumes you have a web form with a FileUpload, a button, and a label control.  Also, this example stores the file uploaded into a folder named "Uploads" which is assumed to pre-exist.

Retrieves an array of all the components of any given type within a starter control (such as a page, table, panel, etc.)  This routine is recursive and will keep iterating down until all the embedded components are found.

This C# code can be invoked to produce an array as  follows:

This code shows how to ask the webserver where the site's root directory is, and how to convert a relative path (like /Uploads) to the full filesystem path.  This will work across environments (i.e. Development/QA/Production).

First, you must add the System.Net.Mail namespace to your project. There are 2 objects we use to send the email, a MailMessage, and an SMTPClient.

This code works from C# projects or from ASP.NET projects. Make sure your mail server is set to relay messages for whoever might be sending the message. In my case my webserver is sending through my exchange server so I had to tell exchange to relay for my webserver.

This article will show how to access a function in a legacy COM dll from a ASP.NET web page. By legacy I mean a dll that is not a .NET managed code dll (a Win32 DLL). 

When designing a WinForms application, the most straightforward way to authenticate a user is using NTLM or Active Directory using WindowsIdentity.GetCurrent. Over the Internet, you can use the whole ASP.Net security setup with Membership.GetUser. The GenericPrincipal object works well when you deploy to a mixed web/WinForms environment. See new GenericIdentity.