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Getting Live Data By everybody in a multiuser environment

Posted on 2006-06-29
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Hi,
I am working on an application which will be used by many users at a time. According to the business requirements, the data statistics is displayed to the user based on which he will take decision. At the same time other users are updating the data and viewing the data.
Is there a way in Microsoft .NET environment  and MS SQL Server to refresh the data at the client end (datagrid) as soon as some other user makes changes to the related data without the user intervention.
I am using both the web forms and windows forms.

Also, is it possible to refresh the client data without distracting the user from the whole page/form/grid refresh.
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Question by:akshay_sumeru
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Richard Quadling earned 2000 total points
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Yes.

The current buzzword for this sort of thing is AJAX.

Essentially the browser/.NET app makes request to the server on a regular basis for new data. This request happens behind the scenes. The response contains either NOCHANGE or the data to upgrade the display and client side code alters the environment.

I don't use .NET and don't really know where it fits in all of this.

If this was a normal web page...

Browser
1 - Use a hidden frame to get the data from the server. The visible frame uses JavaScript to extract the data and updates the display. No page refresh. Older method.
2 - Use XMLHttpRequest (either IE's ActiveX or built in object for FireFox, et al). Same sort of logic as 1.

There are MANY examples of AJAX sites. Googlemail for example.

For .NET, then I think you do the same sort of thing. Either use a hidden frame and use client side scripting to get the data from the frame onto the new page, or XMLHttpRequest.

One thing to be aware of, if your server side code generated the actual javascript required by the client to do all the changes, all the client code is basically 1 eval statement.

Very simple.

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