By G. Andrew Duthie
ASP.NET in a nutshell appeals to 2 audiences: rookies and complicated builders. the center workforce is overlooked. The samples have been simply coded and labored. notwithstanding, the thing version describing the items have been referenced as complicated schematics within the appendix. one other set of examples had to be integrated that confirmed how you can have interaction with the article equipment and homes of the .net elements. I needed to visit the net and skim a number of articles to find the right way to manage the parts via their item version. i have integrated a couple of samples on my site.
Configuration Settings used to be now not basically defined. The customized blunders dealing with was once tricky to understand.
The tree keep watch over view used to be initialized utilizing an xml constitution. The OnTreeNodePopulate occasion used to be want a pattern code demonstration. I create a treenode referred to as which quite a bit the youngsters nodes on call for utilizing the PopulateOnDemand callback.
The Datalist keep watch over has a couple of very important attributes which needs to be attended too: Datakeyfield (Primary Index), Datasource (the Oledb database connection-a AccessDataSource type). ASP.net incorporates the visible C++ culture of occasion mapping. i have selected to take advantage of OnItemCommand occasion to catch the e.commandname for "Insert","Edit","Update", and "Delete". Insert calls for a unique regimen of creating obvious a panel with an enter shape embedded and upon clicking the store button mapping to the AddNewRecord functionality which creates a insert into sql string and assigns it to the datasource insertcommand characteristic and transacts the dml then resets the enter variable and hides the panel.
ASP.NET System.Data.OleDB (connection, command item) energetic Server Pages. The oledb insurance is extremely missed within the ASP.NET in a nutshell ebook. I used the web to find how one can open a MS entry oledb connection and execute an replace DML utilizing the oledbcommand object.
Validators have been very curiosity. I create an enter shape has 3 varieties of validation workouts: required validator, customized validator, and diversity validator.
If the validation rule isn't met than an customized errors message will seem to the correct of the textbox. you could strength validation via calling the validator procedure validate. the outcome might be lower back to the calling application through invoking the IsValid strategy. i have used a typical expression to envision for legitimate e mail, forex, and different styles. there are many important websites for normal expression which are searchable from my website from "active server pages" query.
ASP.NET Calendar keep watch over - altering demonstrate Years - Updating a Textbox with choice - lively Server Pages I coded a codeset of interplay among a textbox, dropdown combination field, and a calendar. i began by means of populating a drop down combination field with plus and minus two decades from the present yr and choosing the present 12 months. An occasion handler is outlined for the OnSelectedIndexChanged worth which referred to as "Set_Calendar" eventhandler. "Set_Calendar" occasion handler makes use of the chosen price for yr from the drpCalYear regulate to initialize the calendar utilizing the VisibleDate estate of the calendar keep watch over. The autopostback characteristic of the drop down combobox needs to be set to actual permitting a postback while index choice swap has happened.
Other issues that have been of interest:
Understanding the system.array
Using .net collections
working with arraylists and hashtables
Using the appliance object
Using the consultation object
reading and writing cookies
using the question string
understanding VB classes
formating Numbers, dates, and times
Using the datareader
raising occasions and enforce callbacks
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Additional resources for ASP.NET in a Nutshell
Asp extension and in which that page, either through embedded VBScript or JScript or through script in combination with components built on Microsoft's COM standard, returned HTML to the browser to form the user interface with which the client would interact. Clients typically interacted with the application only through this user interface and did not have the option of creating their own alternative interface to the functionality exposed by the application. NET provides an enhanced version of this type of application, which we'll discuss in the next section.
The use of code-behind files is one of the mechanisms that aides the separation of the UI and the UI logic. NET page using code-behind files requires two steps: 1. Developing the page's UI using HTML and web controls. 2. NET languages. A code-behind file consists of a class inherited from the Page class. NET page. NET page. NET page and the code-behind file are tightly coupled. NET programming language you choose to develop the code. js for JScript. NET compile the code-behind file for you. NET page.
Org for more information on current recommendations), application developers on a given platform can expose their functionality to others on different platforms in a fashion that makes the differences in platform transparent. As long as both the server and the client follow the SOAP specification, the applications can communicate, regardless of the platform differences. Since SOAP has not yet been adopted as a recommendation and is still under development, current implementations from Microsoft and other vendors have not yet achieved the level of cross platform interoperability that is promised once SOAP is adopted as a recommendation.