 |
Formatting dates with VB.NET and ASP.NET
|
| Total Hit (3195) |
«B»This tutorial covers formatting dates. To follow this tutorial, there are some basic requirements:«/B»
A text editor or a visual web design program with HTML editing capabilities installed on your computer since this exercise will require hand coding. Examples include Notepad, Homesite, or
....Read More |
Rating
 |
|
|
|
|
|
ASP.NET process recycling
|
| Total Hit (1810) |
Application recycling is a great feature that lets you configure an application so that ASP.NET automatically shuts it down and restarts it after a given period or a given number of client requests, or when it consumes more memory than the specified threshold. This feature is a lifesaver if the appl
....Read More |
| Rating
|
|
|
|
Centralize ASP.NET settings in one file
|
| Total Hit (1799) |
Although ASP.NET lets you distribute web.config files over all the application's subdirectories, it surely doesn't force you to do so. You can keep all the application settings in its main web.config file, while enforcing different settings on a directory-by-directory base, if you want. The key to t
....Read More |
| Rating
|
|
|
|
Change script timeout through ASP.NET configuration files
|
| Total Hit (4415) |
The httpRuntime tag in ASP.NET configuration files lets you determine several behaviors of ASP.NET at the machine or site, including the global value for script timeout. Here's the complete syntax for this tag:
«Code LangId=4»
<httpRuntime executionTimeout="seconds"
maxRequestLengt
....Read More |
| Rating
|
|
|
|
Prevent unauthorized changes to ASP.NET configuration files
|
| Total Hit (1802) |
Some ASP.NET settings are so critical that the system administrator should prevent them from being changed by individual applications. This ability is especially crucial for servers that host multiple applications written by different developers. In this case, the administrator can prevent undesired
....Read More |
| Rating
|
|
|
|
Reduce Server Too Busy errors with the httpRuntime tag
|
| Total Hit (2487) |
The httpRuntime tag in ASP.NET configuration files lets you determine several features of ASP.NET at the machine or site level, including the how ASP.NET uses multi-threading. Here's the complete syntax for this tag:
«Code LangId=4»
<httpRuntime executionTimeout="seconds"
maxReques
....Read More |
| Rating
|
|
|
|
Registering ASP.NET on IIS after installing the .NET Framework
|
| Total Hit (1957) |
If you install the .NET Framework on a system that has IIS already installed, IIS is automatically configured to handle requests to ASP.NET pages, and to redirect the execution to the ASP.NET runtime. However, it may happen that you installed the framework on a Windows 2000 Professional system where
....Read More |
| Rating
|
|
|
|
Use custom error pages in ASP.NET
|
| Total Hit (1906) |
The tag in ASP.NET configuration files affects how error pages are managed in an ASP.NET application and whether developers can redirect users to their custom error pages when an exception is thrown. The syntax for this tag is:
<customErrors mode="On|Off|RemoteOnly" defaultRedirect="url">
<e
....Read More |
Rating
 |
|
|
|
Associating a custom bitmap to a web or Windows custom control
|
| Total Hit (2797) |
When you create a custom Windows or Web control, compile it and add it to the Visual Studio .NET's Toolbox, the control is added to the toolbox with a default bitmap representing a gear. This might be fine if you're developing the controls for your own use, but it surely isn't what you want if you'r
....Read More |
| Rating
|
|
|
|
|
|
Relative Urls in user controls
|
| Total Hit (2640) |
Urls that you set in user-control's child controls are relative to the user control's directory, not to the host page's directory. Say for example that you have an user-control located under the /UserControls directory, and the host page under the / root directory. The user-control exposes a custom
....Read More |
| Rating
|
|
|
|
Persistent session state
|
| Total Hit (2727) |
In ASP.NET 1.0 you have the option to maintain the session state on an external process, in SQL Server, by setting the mode attribute of the sessionState tag in web.config to SQLServer. The problem is that the data is stored in the SQL Server's Temp database, and thus the data is lost if the SQL Ser
....Read More |
| Rating
|
|
|
|
Preload subject and body when offering an email URL
|
| Total Hit (2815) |
You can easily add a link in your ASP and ASP.NET pages that, when clicked, runs the default mail program (e.g. Outlook) and allows the user to send a message to the email address you provide:
«Code LangId=4»
<a href=mailto:someone@yoursite.com>Click here to send a message</a>
«/Code»
Interes
....Read More |
| Rating
|
|
|
|
Redirecting to the real referrer page during a postback
|
| Total Hit (3182) |
Say that you have a page loaded from another page, and that in this page you have a "Save and Return" button that does something and returns to the previous page. For example you may have an Orders page that loads a Details page, where you make some changes and press the button to save the changes a
....Read More |
| Rating
|
|
|
|
Saving data between postbacks in the ViewState collection
|
| Total Hit (2562) |
In classic ASP, the only way to preserve information - for example, the value of a variable- - between consecutive client requests is by means of Session variables, cookies, or other awkward techniques, such as arguments on the query string or values in hidden fields.
ASP.NET gives you yet anoth
....Read More |
| Rating
|
|
|
|
Saving HTTP requests for better debugging
|
| Total Hit (2594) |
The new SaveAs method of the Request object saves the current HTTP request to a file, which can be very useful for logging and debugging reasons. You should pass True to its second argument if you want to save HTTP headers as well:
«Code LangId=4»
Request.SaveAs "c:\lastrequest.txt", True
«/Co
....Read More |
| Rating
|
|
|
|
Sending files to the browser
|
| Total Hit (2753) |
The ASP.NET Response object has been greatly expanded in its capability to send output to the client browser. For example, the WriteFile method can send the contents of any text, HTML, or XML file to the browser; in classic ASP you have to load the file in memory and then pass its contents to a Writ
....Read More |
| Rating
|
|
|
|
The AutoPostBack property requires client-side scripting
|
| Total Hit (2487) |
A few Web Forms control expose the AutoPostBack property, which makes it possible to start a postback when the user clicks on these controls or changes their contents. By default this property is False, but you can set it to True for the following controls: TextBox, CheckBox, RadioButton, CheckBoxLi
....Read More |
| Rating
|
|
|
|
The MapPath method
|
| Total Hit (2681) |
The ASP.NET Page object exposes the MapPath method, which converts a virtual path into a physical path, so it' is useful for passing arguments to objects that don't work with virtual paths:
«Code LangId=4»
Dim sr As New System.IO.StreamReader(Me.MapPath("/data/values.dat"))
«/Code»
You can al
....Read More |
| Rating
|
|
|
|
Update the ACL of a file from an ASP.NET application
|
| Total Hit (2624) |
It's not uncommon that ASP.NET applications have the need to use a personal .config file to write some runtime information. Since ASP.NET applications are not granted the permission to create or edit files on the server, the best place to store persistent data is a table in a database server (not an
....Read More |
| Rating
|
|
|
|
Uploading a file on the server
|
| Total Hit (4673) |
Uploading a file from the client to the server is very straightforward with ASP.NET. Just use the «code LangId=4»<input type="file" runat="server"> «/code»tag and its wrapper class HtmlInputFile. Here's how you define the control on the page:
«Code LangId=4»
<form runat="server" enctype="multipa
....Read More |
| Rating
|
|
|
|
Using static variables instead of the Application object
|
| Total Hit (3536) |
If you want to share a value or an object instance between all the pages of any session, you typically use the Application object. However, a good alternative is to use a public variable defined in a module (VB.NET only), or a static field/property defined in a class. Static properties maintain thei
....Read More |
| Rating
|
|
|
|
Accessing user controls from the code-behind
|
| Total Hit (2761) |
When you add a user control to an ASP.NET page, Visual Studio .NET does not add a control declaration as it does when you add standard ASP.NET web controls. The result is that you can't directly access the user control from the code-behind and programmatically change its properties and call its meth
....Read More |
| Rating
|
|
|
|
|
|
Creating a scrollable DataGrid
|
| Total Hit (2824) |
When you create a DataGrid, it would be often good to specify its height, and have the DataGrid show a scrollbar if the content is longer than the given height. This would allow to make up a fixed layout that doesn't get messed up if there are a few or a lot of lines/records to show. The DataGrid co
....Read More |
| Rating
|
|
|
|
Hiding controls defined within templates to some users
|
| Total Hit (2633) |
It happens frequently that you want to hide some input controls or links if the current user is not logged in (it runs with the anonymous account), or if the logged user is not a member of a specific group. For example, you may want to hide the Edit/Delete buttons to users that are not Administrator
....Read More |
| Rating
|
|
|
|
Implementing a two-way sorting for the DataGrid control
|
| Total Hit (2614) |
DataGrid's sorting functionality is not automatic, the control takes care of "just" rendering the column headers as hyperlinks, and gives you the ability to handle the click on those links, by means of the SortCommand event. Then you manually sort the records (by means of a new DataView from an exis
....Read More |
| Rating
|
|
|
|
Moving the focus on a control when the page loads
|
| Total Hit (2527) |
ASP.NET doesn't provide a built-in method for giving a control the input focus when the page loads. In fact, you can assign the TabIndex properties to controls on a page, but you can't use this property to set the initial focus on a control of your choice.
The following procedure provides you wit
....Read More |
| Rating
|
|
|
|
Showing a graphical checkmark on DataGrid's boolean columns
|
| Total Hit (2630) |
While working with template-based controls such as the Repeater, DataList or DataGrid, it often happens that you don't want to show just plain text as it is retrieved from the data source, but want to interpret the data and represent it in other ways. For example, you may want to show a graphical ch
....Read More |
| Rating
|
|