Inserting updating and deleting data with the objectdatasource


18-Nov-2017 19:14

The traditional and server HTML controls have the following events that can execute a script when they are raised: The content file contains the HTML or ASP.

NET server controls allow calling client side code written using Java Script or VBScript. NET server controls use client side scripting to provide response to the users without posting back to the server. Apart from these scripts, the Button control has a property On Client Click, which allows executing client-side script, when the button is clicked.

The code behind file contains the class definition.

NET control tags and literals to form the structure of the page.

To clear the concept, let us take an example of a shopping cart. Items are selected from a page, say the items page, and the total collected items and price are shown on a different page, say the cart page. Controls are also used for structural jobs, like validation, data access, security, creating master pages, and data manipulation. NET uses five types of web controls, which are: ASP. If the Checked attribute is set to true for multiple radio buttons in a group, then only the last one is considered as true.

Only HTTP cannot keep track of all the information coming from various pages. NET session state and server side infrastructure keeps track of the information collected globally over a session. NET runtime carries the page state to and from the server across page requests while generating ASP. NET server controls with a visual aspect are derived from the Web Control class and inherit all the properties, events, and methods of this class. Basic syntax of check box: These control let a user choose from one or more items from the list.

For example, when a user clicks a button the 'Click' event is generated. Each List Item object represents one item in the list. In this chapter, we will discuss the basic controls available in ASP. A text box control can accept one or more lines of text depending upon the settings of the Text Mode attribute. Consider the simple page: tags contain the hidden fields which store the view state and validation information. NET provides three types of button control: Text box controls are typically used to accept input from the user.For handling events, there are in-built attributes and event handlers. Items in a List Item Collection are numbered from 0.

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Event handler is coded to respond to an event, and take appropriate action on it. When the items into a list box are loaded using strings like: lstcolor. Add("Blue"), then both the Text and Value properties of the list item are set to the string value you specify.NET runtime codes, and incorporates the state of the server side components in hidden fields. The Web Control class itself and some other server controls that are not visually rendered are derived from the System. List boxes and drop-down lists contain one or more list items.