HttpEncoder type and then configuring ASP. NET to use the custom type in the httpRuntime section of the Web. After a custom encoder has been configured, ASP. NET automatically calls the custom encoding implementation whenever public encoding methods of the System. HttpUtility or System. HttpServerUtility classes are called. This lets one part of a Web development team create a custom encoder that implements aggressive character encoding, while the rest of the Web development team continues to use the public ASP.
By centrally configuring a custom encoder in the httpRuntime element, you are guaranteed that all text-encoding calls from the public ASP.
In order to increase the number of Web sites that can be hosted on a single server, many hosters run multiple ASP. NET applications in a single worker process. However, if multiple applications use a single shared worker process, it is difficult for server administrators to identify an individual application that is experiencing problems.
To enable this functionality, you can add the following XML configuration snippet to the aspnet. Note The aspnet. NET Framework is installed. It is not the Web. When the appDomainResourceMonitoring feature has been enabled, two new performance counters are available in the "ASP. Both of these performance counters use the new CLR application-domain resource management feature to track estimated CPU time and managed memory utilization of individual ASP.
NET applications. As a result, with ASP. NET 4, administrators now have a more granular view into the resource consumption of individual applications running in a single worker process. You can create an application that targets a specific version of the. NET Framework. NET 4, a new attribute in the compilation element of the Web. NET Framework 4 and later. If you explicitly target the. NET Framework 4, and if you include optional elements in the Web. NET Framework 4. If you do not explicitly target the.
NET Framework 4, the target framework is inferred from the lack of an entry in the Web. The following example shows the use of the targetFramework attribute in the compilation element of the Web. When you create a new website or project, a Scripts folder containing the following 3 files is created:. Include the unminified version of jQuery while developing an application. Include the minified version of jQuery for production applications.
NET TextBox controls to yellow when they have focus. By taking advantage of the Microsoft Ajax CDN, you can significantly improve the performance of your Ajax applications. The ASP. Setting this one property can have a dramatic impact on the performance of your web application. In the past, if you used the ASP.
NET Ajax Library. By taking advantage of the new ScriptManager. NET Ajax Library that you need. NET Ajax component scripts that you need:. Web Forms has been a core feature in ASP. Many enhancements have been in this area for ASP. NET 4, including the following:. These two properties represent corresponding meta tags in your page, as shown in the following example:.
These two properties work the same way that the page's Title property does. They follow these rules:. You can set these properties at run time, which lets you get the content from a database or other source, and which lets you set the tags dynamically to describe what a particular page is for.
You can also set the Keywords and Description properties in the Page directive at the top of the Web Forms page markup, as in the following example:. The contents of the description meta tag are used for improving search listing previews in Google. For details, see Improve snippets with a meta description makeover on the Google Webmaster Central blog. Google and Windows Live Search do not use the contents of the keywords for anything, but other search engines might.
These new properties are a simple feature, but they save you from the requirement to add these manually or from writing your own code to create the meta tags. By default, view state is enabled for the page, with the result that each control on the page potentially stores view state even if it is not required for the application.
View state data is included in the markup that a page generates and increases the amount of time it takes to send a page to the client and post it back. Storing more view state than is necessary can cause significant performance degradation. NET, developers could disable view state for individual controls in order to reduce page size, but had to do so explicitly for individual controls. NET 4, Web server controls include a ViewStateMode property that lets you disable view state by default and then enable it only for the controls that require it in the page.
Enabled enables view state for that control and for any child controls that are set to Inherit or that have nothing set.
Disabled disables view state, and Inherit specifies that the control uses the ViewStateMode setting from the parent control. The following example shows how the ViewStateMode property works. The markup and code for the controls in the following page includes values for the ViewStateMode property:.
As you can see, the code disables view state for the PlaceHolder1 control. The child label1 control inherits this property value Inherit is the default value for ViewStateMode for controls.
When the page is first loaded, the Text property of both Label controls is set to the string "[DynamicValue]". The effect of these settings is that when the page loads the first time, the following output is displayed in the browser:.
The label1 control whose ViewStateMode value is set to Disabled has not preserved the value that it was set to in code. However, the label2 control whose ViewStateMode value is set to Enabled has preserved its state.
You can also set ViewStateMode in the Page directive, as in the following example:. The Page class is just another control; it acts as the parent control for all the other controls in the page. Because controls default to Inherit , controls will inherit the Enabled property value unless you set ViewStateMode at page or control level. The value of the ViewStateMode property determines if view state is maintained only if the EnableViewState property is set to true.
A good use for this feature is with ContentPlaceHolder controls in master pages, where you can set ViewStateMode to Disabled for the master page and then enable it individually for ContentPlaceHolder controls that in turn contain controls that require view state. NET determines the capabilities of the browser that a user is using to browse your site by using a feature called browser capabilities.
Browser capabilities are represented by the HttpBrowserCapabilities object exposed by the Request. Browser property. For example, you can use the HttpBrowserCapabilities object to determine whether the type and version of the current browser supports a particular version of JavaScript.
Or, you can use the HttpBrowserCapabilities object to determine whether the request originated from a mobile device. The HttpBrowserCapabilities object is driven by a set of browser definition files. These files contain information about the capabilities of particular browsers. NET 4, these browser definition files have been updated to contain information about recently introduced browsers and devices such as Google Chrome, Research in Motion BlackBerry smartphones, and Apple iPhone.
NET version 3. At the computer level, you create or update a. After you define the browser capability, you run the following command from the Visual Studio Command Prompt in order to rebuild the browser capabilities assembly and add it to the GAC:.
For an individual application, you create a. NET 4 includes a feature referred to as browser capabilities providers. As the name suggests, this lets you build a provider that in turn lets you use your own code to determine browser capabilities.
In practice, developers often do not define custom browser capabilities. Browser files are hard to update, the process for updating them is fairly complicated, and the XML syntax for. What would make this process much easier is if there were a common browser definition syntax, or a database that contained up-to-date browser definitions, or even a Web service for such a database.
The new browser capabilities providers feature makes these scenarios possible and practical for third-party developers. There are two main approaches for using the new ASP. NET browser capabilities definition functionality, or totally replacing it.
The following sections describe first how to replace the functionality, and then how to extend it. To replace the ASP. NET browser capabilities definition functionality completely, follow these steps:. Create a provider class that derives from HttpCapabilitiesProvider and that overrides the GetBrowserCapabilities method, as in the following example:. The code in this example creates a new HttpBrowserCapabilities object, specifying only the capability named browser and setting that capability to MyCustomBrowser.
In order to use a provider with an application, you must add the provider attribute to the browserCaps section in the Web. You can also define the provider attributes in a location element for specific directories in application, such as in a folder for a specific mobile device.
The following example shows how to set the provider attribute in a configuration file:. Another way to register the new browser capability definition is to use code, as shown in the following example:. Any change to the BrowserCapabilitiesProvider class must occur before any code in the application executes, in order to make sure that the cache remains in a valid state for the resolved HttpCapabilitiesBase object.
The preceding example has one problem, which is that the code would run each time the custom provider is invoked in order to get the HttpBrowserCapabilities object. This can happen multiple times during each request. In the example, the code for the provider does not do much. However, if the code in your custom provider performs significant work in order to get the HttpBrowserCapabilities object, this can affect performance.
To prevent this from happening, you can cache the HttpBrowserCapabilities object. Follow these steps:. Create a class that derives from HttpCapabilitiesProvider , like the one in the following example:. In the example, the code generates a cache key by calling a custom BuildCacheKey method, and it gets the length of time to cache by calling a custom GetCacheTime method.
The code then adds the resolved HttpBrowserCapabilities object to the cache. The object can be retrieved from the cache and reused on subsequent requests that make use of the custom provider.
NET 4. You can also extend the ASP. NET browser capabilities functionality by adding new browser capabilities definitions to those that are already in ASP. You can do this without using the XML browser definitions. The following procedure shows how. Create a class that derives from HttpCapabilitiesEvaluator and that overrides the GetBrowserCapabilities method, as shown in the following example:. This code first uses the ASP. NET browser capabilities functionality to try to identify the browser.
However, if no browser is identified based on the information defined in the request that is, if the Browser property of the HttpBrowserCapabilities object is the string "Unknown" , the code calls the custom provider MyBrowserCapabilitiesEvaluator to identify the browser.
In addition to creating a custom browser definition provider and to dynamically creating new browser definitions, you can extend existing browser definitions with additional capabilities. This lets you use a definition that is close to what you want but lacks only a few capabilities. To do this, use the following steps. The example code extends the existing ASP.
NET HttpCapabilitiesEvaluator class and gets the HttpBrowserCapabilities object that matches the current request definition by using the following code:. The code can then add or modify a capability for this browser. There are two ways to specify a new browser capability:. In the previous example, the code adds a capability named MultiTouch with a value of true. Set existing properties of the HttpCapabilitiesBase object. In the previous example, the code sets the Frames property to true.
This property is simply an accessor for the IDictionary object that is exposed by the Capabilities property. Note This model applies to any property of HttpBrowserCapabilities , including control adapters.
NET 4 adds built-in support for using routing with Web Forms. Routing lets you configure an application to accept request URLs that do not map to physical files. Instead, you can use routing to define URLs that are meaningful to users and that can help with search-engine optimization SEO for your application.
For example, the URL for a page that displays product categories in an existing application might look like the following example:. By using routing, you can configure the application to accept the following URL to render the same information:.
Routing has been available starting with ASP. NET 3. For an example of how to use routing in ASP. However, ASP. NET 4 includes some features that make it easier to use routing, including the following:.
The following example is equivalent to the SearchRoute definition shown in the previous example, but uses the PageRouteHandler class. The first route definition also specifies that the parameter named searchterm should be extracted from the URL and passed to the page. The checkPhysicalUrlAccess parameter specifies whether the route should check the security permissions for the physical page being routed to in this case, search.
These permissions are defined in the Web. In the example configuration, access is denied to the physical page search.
In the code of the Web Forms physical page, you can access the information that routing has extracted from the URL or other information that another object has added to the RouteData object by using two new properties: HttpRequest. RequestContext and Page. RouteData wraps HttpRequest. The following example shows how to use Page.
The code extracts the value that was passed for the searchterm parameter, as defined in the example route earlier. Consider the following request URL:. When this request is made, the word "scott" would be rendered in the search.
The method described in the previous section shows how to get route data in code in a Web Forms page. You can also use expressions in markup that give you access to the same information.
Expression builders are a powerful and elegant way to work with declarative code. NET 4 includes two new expression builders for Web Forms routing. The following example shows how to use them. This saves you from having to hard-code the complete URL into the markup, and lets you change the URL structure later without requiring any change to this link.
NET automatically works out the correct route that is, it generates the correct URL based on the input parameters. You can also include a route name in the expression, which lets you specify a route to use. When the page that contains this control runs, the value "scott" is displayed in the label. The RouteValue expression makes it simple to use route data in markup, and it avoids having to work with the more complex Page. RouteData["x"] syntax in markup. The RouteParameter class lets you specify route data as a parameter value for queries in a data source control.
It works much like the class, as shown in the following example:. In this case, the value of the route parameter searchterm will be used for the companyname parameter in the Select statement. NET, namely how controls create the id attribute for elements that they render. Knowing the id attribute for rendered elements is important if your application includes client script that references these elements.
Until ASP. NET 4, the algorithm for generating the id attribute from the ClientID property has been to concatenate the naming container if any with the ID, and in the case of repeated controls as in data controls , to add a prefix and a sequential number. While this has always guaranteed that the IDs of controls in the page are unique, the algorithm has resulted in control IDs that were not predictable, and were therefore difficult to reference in client script.
You can set the ClientIDMode property for any control, including for the page. Possible settings are the following:. You can set the ClientIDMode property at the page level.
This defines the default ClientIDMode value for all controls in the current page. As a result, if you do not set this property anywhere in your code, all controls will default to the AutoID algorithm. You set the page-level value in the Page directive, as shown in the following example:. You can also set the ClientIDMode value in the configuration file, either at the computer machine level or at the application level.
This defines the default ClientIDMode setting for all controls in all pages in the application. If you set the value at the computer level, it defines the default ClientIDMode setting for all Web sites on that computer. The following example shows the ClientIDMode setting in the configuration file:. As noted earlier, the value of the ClientID property is derived from the naming container for a control's parent.
In some scenarios, such as when you are using master pages, controls can end up with IDs like those in the following rendered HTML:. Even though the input element shown in the markup from a TextBox control is only two naming containers deep in the page the nested ContentPlaceholder controls , because of the way master pages are processed, the end result is a control ID like the following:. This ID is guaranteed to be unique in the page, but is unnecessarily long for most purposes. Imagine that you want to reduce the length of the rendered ID, and to have more control over how the ID is generated.
For example, you want to eliminate "ctlxxx" prefixes. The easiest way to achieve this is by setting the ClientIDMode property as shown in the following example:. These settings result in the following markup the rest of the page and the master page is assumed to be the same as in the previous example :. The name attribute of rendered elements is unaffected, so the normal ASP.
NET functionality is retained for events, view state, and so on. A side effect of resetting the naming hierarchy is that even if you move the markup for the NamingPanel elements to a different ContentPlaceholder control, the rendered client IDs remain the same.
Note It is up to you to make sure that the rendered control IDs are unique. If they are not, it can break any functionality that requires unique IDs for individual HTML elements, such as the client document. The ClientID values that are generated for controls in a data-bound list control by the legacy algorithm can be long and are not really predictable. The ClientIDRowSuffix property can be used only in data-bound controls, and its behavior differs depending on which control you are using.
We may want to get early feedback. Goals Our We are using it in production internally. It is fully supported for production use. We still need to implement support for brand new When we shipped the new build system with TFS , we ran out of time to add gated checkin. Among the many features in TFS Update 2, including the new release You no longer have to use the version of Visual Studio Team Explorer that matches your server to create a team project.
For the first time ever, you can now create a team project from the web UI with Team Foundation Server Update 2 or newer. Today at the Build conference, Azure announced a new feature called Azure Functions. As noted, there no automated FoxPro to. And there no automated conversion form Delpi to. Such knowledge is "basic" to any developer in our industry. As noted, I do find code and class modules from VBA move well to vb.
More worse is as I stated, the "bulk" Of the value code in those Access applications tends to be in forms, and that's the very code that don't covert over. Also using vb. What this means is the Access application will be the functional spec, but not the technical spec for your. Please recommend best option for the migration. This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread.
I have the same question Report abuse. Details required :. Cancel Submit. Previous Next. Daniel Pineault MVP. You have to start over from scratch. How satisfied are you with this reply? Thanks for your feedback, it helps us improve the site.
In reply to Daniel Pineault's post on July 10, Thanks Daniel. Am I right? Albert D. Kallal MVP. In reply to ManimaranKR's post on July 10, They are VERY similar in syntax.
The vast bulk of your code in Access will be VBA, not macro code. Regards Albert D. In reply to Albert D. Kallal's post on July 10, Hi Albert, Thanks for your detailed explaination. Net syntax is not much different Access vs VB. Many Thanks Regards, Manimaran R. In reply to ManimaranKR's post on July 11, As noted, code modules in Access do port over to.
However, you mentioned C , and not vb. So the above is quite much how this process can be approached. Regards, Albert D. Josh Black josh. Agreed with Albert. Kallal's post on July 11, Thanks Alert for your valuable time and explanation. Please advise. Many Thanks in Advance. Regards, Manimaran R. In reply to ManimaranKR's post on July 19, Net class file Read my post again - slower!
It may well be the right choice to re-write this system as. This site in other languages x.
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