How to develop a web chat application by using ASP. This code sample demonstrates a step-by-step guide that illustrates how to create a web chat application by using ASP. You can get the sample package from the download icons below. Difficulty level To download this code sample, click one of the following links: Technical overview You should have some experience in chatting with friends on the web.
You may think it is complicated to develop a web chat application. However, ASP.
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NET provides an easy and accessible way to do it. The technical overview introduces how to construct a web chat room by using AJAX. The principle controls needed to construct a web chat room by using AJAX are not that complicated.
As you know, a web chat application needs the following four basic controls: A list control that is used to show the list of chat room members. A list control that is used to show the list of chat messages. A text box control that is used to input messages.
A button that is used to send a message. Users input a message in the text box, and then they press the Send button.
In this situation, the message is sent to the server. The message list is updated every two seconds to get the newest messages in the chat room from the server. It is difficult to make an AJAX web chat application that behaves the same way as a Windows Form application, because you cannot maintain a continuous connection with the server.
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Therefore, a lot of events that could be immediately communicated between a client and server cannot be realized. The common workaround is to make the web chat application send a request every few seconds to check for server-side updates.
For wsb details about these technologies, click the links in the "References" section. Sample Overview This code sample is separated into 4 sections: The Data section.
The Service section. For example, the WCF service.
The Logic section. For example, the classes that are used for the service and that communicate data. The User interface UI section.
For example, s and client scripts. Download the sample code and follow these steps to get started developing a web chat application. Data Create an ASP. NET web application.
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Create a database file. For example, you can create an. Open the database file and create the following four tables: Table name.