We are having an API called “Cascade To” which is used to map the child Dropdown list in the parent Dropdown list control.By selecting an option in the parent dropdown, the child Drop Down List has to load the corresponding value regarding the parent Dropdown.or can you please send me the example with 3 syncfusion dropdownlist with example?As per your requirement we can achieve it by applying “Cascading” support to our Dropdownlist controls or by changing the Data Source of the other Dropdown list by using “On Value Select” server side event of our Dropdownlist control. NET 2.0 this particular issue could have been easily fixed by putting the Selected Value(s) into Control State so it always gets stored. I'm not sure how that could be handled if View State is of, short of implementating a custom listbox control that implements controlstate for the Selected Value property. And it won't work if View State is off completely on the page.It stores and hooks Control State events, so everything happens at the right time automatically.
NET AJAX Extensions, which includes the Script Manager component, the Update Panel control, and the Update Progress control, and considers scenarios in which they should or should not be utilized.
NET AJAX Extensions is the ability to do a partial or incremental page updates without doing a full postback to the server, with no code changes and minimal markup changes.
The advantages are extensive – the state of your multimedia (such as Adobe Flash or Windows Media) is unchanged, bandwidth costs are reduced, and the client does not experience the flicker usually associated with a postback. NET technology brings an object-oriented and event-driven programming model and unites it with the benefits of compiled code.
Visual Studio 2008 does not appear to come with a pre-defined template for an ASP. However, such a template was available within Visual Studio 2005 if the Visual Studio 2005 and ASP. Consequently, configuring a web site and starting with the AJAX-Enabled Web Site template will likely be even easier, as the template should include a fully-configured web.config file (supporting all of the ASP.
NET AJAX Extensions, including Web Services access and JSON serialization - Java Script Object Notation) and includes an Update Panel and Content Template within the main Web Forms page by default.