By G. Andrew Duthie
ASP.NET in a nutshell appeals to 2 audiences: newcomers and complex builders. the center team is ignored. The samples have been simply coded and labored. even if, the item version describing the items have been referenced as advanced schematics within the appendix. one other set of examples had to be incorporated that confirmed how one can have interaction with the item equipment and houses of the .net elements. I needed to visit the net and browse a number of articles to find find out how to control the elements via their item version. i have incorporated a couple of samples on my site.
Configuration Settings used to be now not truly defined. The customized mistakes dealing with used to be tricky to understand.
The tree keep watch over view was once initialized utilizing an xml constitution. The OnTreeNodePopulate occasion was once desire a pattern code demonstration. I create a treenode known as which so much the kids nodes on call for utilizing the PopulateOnDemand callback.
The Datalist keep watch over has a couple of very important attributes which has to be attended too: Datakeyfield (Primary Index), Datasource (the Oledb database connection-a AccessDataSource type). ASP.net contains the visible C++ culture of occasion mapping. i have selected to take advantage of OnItemCommand occasion to trap the e.commandname for "Insert","Edit","Update", and "Delete". Insert calls for a different regimen of creating obvious a panel with an enter shape embedded and upon clicking the keep 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) lively Server Pages. The oledb assurance is extremely missed within the ASP.NET in a nutshell booklet. I used the web to find how you 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 different types 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 appropriate of the textbox. you could strength validation through calling the validator technique validate. the end result might be back to the calling software through invoking the IsValid procedure. i have used a standard expression to ascertain for legitimate e-mail, foreign money, and different styles. there are various necessary websites for normal expression which are searchable from my web site from "active server pages" query.
ASP.NET Calendar keep an eye on - altering demonstrate Years - Updating a Textbox with choice - lively Server Pages I coded a codeset of interplay among a textbox, dropdown mixture field, and a calendar. i began by means of populating a drop down combination field with plus and minus twenty years from the present yr and choosing the present 12 months. An occasion handler is outlined for the OnSelectedIndexChanged price which known as "Set_Calendar" eventhandler. "Set_Calendar" occasion handler makes use of the chosen worth for 12 months from the drpCalYear keep an eye on to initialize the calendar utilizing the VisibleDate estate of the calendar regulate. The autopostback characteristic of the drop down combobox has to be set to real permitting a postback whilst index choice switch has happened.
Other themes that have been of interest:
Understanding the system.array
Using .net collections
working with arraylists and hashtables
Using the applying 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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ASP. internet in a nutshell appeals to 2 audiences: newcomers and complicated builders. the center team is overlooked. The samples have been simply coded and labored. although, the thing version describing the gadgets have been referenced as advanced schematics within the appendix. one other set of examples had to be incorporated that confirmed the best way to engage with the article tools and homes of the .
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Extra resources for ASP.NET in a Nutshell
NET tracing feature is enabled for the page. Enabling tracing at the page level results in information about the current request -- including request time, HTTP status code, cookie information, page control tree, and HTTP header information -- being appended to the page output. Tracing can provide a great deal of information useful for debugging or understanding what is happening with a given page. For performance and security reasons, tracing should not be enabled for production applications. config configuration file, is False.
Config configuration file. Part I: Introduction 43 44 Part I: Introduction Description <%@ Page Description="textdescription" %> Specifies a text description of the page. NET runtime. EnableSessionState <%@ Page EnableSessionState="True|False|ReadOnly" %> Specifies whether the page supports session state. This attribute can be used to disable or delay the creation of sessions, which are used for state management. Setting this attribute to False when session state is not utilized can improve the performance of your application.
When ViewState is enabled for a page, individual controls can disable their own ViewState for better performance. Because ViewState is round-tripped between the server and client, you should be cognizant of the size of the ViewState field for the page. Disabling ViewState where it is not necessary (either at the page or control level) may improve performance. config configuration file, is True. NET should run a machine authentication check (MAC) on the ViewState contents to ensure that the ViewState was not tampered with on the client.