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What is ISAPI filter?

Posted By :nishithraj     Posted Date :November 27, 2009    Points :10   Category :ASP.Net 
ISAPI filters are the DLL files used to filter each file requests in IIS. Also they find one they need to process. The ability to examine and modify both incoming and outgoing streams of data makes ISAPI filters powerful and flexible.

You can also find related Interview Question to What is ISAPI filter?  below: 

What is Servlet Filter and how does it work?

  
Filters are powerful tools in servlet environment. Filters add certain functionality to the servlets apart from processing request and response paradigm of servlet processing. Filters manipulate the request and response in a web application, and they can be applied to any resources like HTML, graphics, a JSP page which are served by the servlet engine. Authentication of data, format conversion of data and redirecting the page to another page are certain useful functions of filters.

A filter is configured in a web.xml file. The class using the filters should extend javax.servlet.Filter. Every request in a web application, the servlet container decides the filters to apply and adds them to the filter chain, in the order they appear in web.xml file. A filter also has life cycle mechanisms init(),doFilter() and destroy(). (More...)

How to insert filter on various LIST webparts by using HTML FORM webpart in SharePoint 2010?

  
To insert a filter on List webpart by HTML Form webpart in SharePoint 2010,
1. Insert a HTML Form editor webpart on the same page where we have list that we want to filter.
2. Point to HTML webpart, click the 'down arrow', click 'connections' and point to 'Provide form value to' option.
3. Click the name of the webpart to which we want filter
4. In the 'Choose Connection' dialog box and click the 'Configure Connection' tab.
5. In the 'Form Connection Type' menu, select the field that matches the information from the HTML Form webpart
6. Click Finish. (More...)

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