Explain the ways of authentication techniques in ASP.NET
Selection of an authentication provider is done through the entries in the web.config file for an application.
The modes of authentication are:
<authentication mode=”windows”>
<authentication mode=”passport”>
<authentication mode=”forms”>
Custom authentication needs installation of ISAPI filter in IIS. It compares incoming requests to a list of source IP addresses and a request is considered to be authenticated if it comes from an acceptable address.
What is the difference between Web Services and Remoting?
Both Remoting and Web Services are ways of communication between applications.
Remoting - In remoting, the applications involved in the communication process may be located on the same computer, different computers in a same or different network. In remoting, both applications know about each other. A proxy of an application object is created on the other application.
Web Services - Communication between applications using web services is platform independent and programming independent. The application that consumes the web service, simply accesses it, without needing to know how this web service has actually been implemented & created.
Here are some of the major differences:
* ASP.NET Web Services may be accessed using HTTP only. Remoting objects may be accessed over any protocol like TCP, SMTP, HTTP
* Web Service are Stateless, whereas Remoting has support for both stateless and with-state environment, which is achieved using Singleton and Singlecall activation
* ASP.NET provides good support to create Web Services. They are easy to deploy. In comparison, Remoting is little complex.
* Web services may be considered very reliable, due to the fact that they are hosted on IIS. In remoting, if IIS is'nt used, then methods like plumbing have to be used to ensure the application reliability.
* In .NET, when we create an application that consumes a web service, the web service may or may not be built using .NET. But while implementing Remoting in .NET, both the applications must be built in .NET.
* Using web services, only a limited number of types may be serialized (XML). Using Remoting, objects like SOAP objects, Binary objects & XML Objects may be serialized.
ASP .NET Interview Questions, Part 2
19. Whats an assembly? Assemblies are the building blocks of the .NET framework. Overview of assemblies from MSDN
20. Describe the difference between inline and code behind. Inline code written along side the html in a page. Code-behind is code written in a separate file and referenced by the .aspx page.
21. Explain what a diffgram is, and a good use for one? The DiffGram is one of the two XML formats that you can use to render DataSet object contents to XML. For reading database data to an XML file to be sent to a Web Service.
22. Whats MSIL, and why should my developers need an appreciation of it if at all? MSIL is the Microsoft Intermediate Language. All .NET compatible languages will get converted to MSIL.
23. Which method do you invoke on the DataAdapter control to load your generated dataset with data? The .Fill() method
24. Can you edit data in the Repeater control? No, it just reads the information from its data source
25. Which template must you provide, in order to display data in a Repeater control? ItemTemplate
26. How can you provide an alternating color scheme in a Repeater control? Use the AlternatingItemTemplate
27. What property must you set, and what method must you call in your code, in order to bind the data from some data source to the Repeater control? You must set the DataSource property and call the DataBind method.
28. What base class do all Web Forms inherit from? The Page class.
29. Name two properties common in every validation control? ControlToValidate property and Text property.
30. What tags do you need to add within the asp:datagrid tags to bind columns manually? Set AutoGenerateColumns Property to false on the datagrid tag
31. What tag do you use to add a hyperlink column to the DataGrid?
32. What is the transport protocol you use to call a Web service? SOAP is the preferred protocol.
33. True or False: A Web service can only be written in .NET? False
34. What does WSDL stand for? (Web Services Description Language)
35. Where on the Internet would you look for Web services? (http://www.uddi.org)
36. Which property on a Combo Box do you set with a column name, prior to setting the DataSource, to display data in the combo box? DataTextField property
37. Which control would you use if you needed to make sure the values in two different controls matched? CompareValidator Control
38. True or False: To test a Web service you must create a windows application or Web application to consume this service? False, the webservice comes with a test page and it provides HTTP-GET method to test.
39. How many classes can a single .NET DLL contain? It can contain many classes.
.Net Interview Questions
1. Explain the differences between Server-side and Client-side code?
2. What type of code (server or client) is found in a Code-Behind class?
3. Should validation (did the user enter a real date) occur server-side or client-side? Why?
4. What does the "EnableViewState" property do? Why would I want it on or off?
5. What is the difference between Servers? Transfer and Response. Redirect? Why would I choose one over the other?
6.Can you give an example of when it would be appropriate to use a web service as opposed to a non-serviced .NET component
7.Let's say I have an existing application written using Visual Studio 6 (VB 6, InterDev 6) and this application utilizes Windows 2000 COM+ transaction services. How would you approach migrating this application to .NET
8.Can you explain the difference between an ADO.NET Dataset and an ADO Recordset?
9. Can you give an example of what might be best suited to place in the Application Start and Session Start subroutines?
10. If I'm developing an application that must accommodate multiple security levels though secure login and my ASP.NET web application is spanned across three web-servers (using round-robin load balancing) what would be the best approach to maintain login-in state for the users?
asp.net questions and answers
What are the various ways of securing a web site that could prevent from hacking etc .. ?
1) Authentication/Authorization
2) Encryption/Decryption
3) Maintaining web servers outside the corporate firewall. etc.,
Name the validation control available in asp.net?.
RequiredField, RangeValidator,RegularExpression,Custom validator,compare Validator
What is a PostBack?
The process in which a Web page sends data back to the same page on the server.
What is different b/w webconfig.xml & Machineconfig.xml
Web.config & machine.config both are configuration files.Web.config contains settings specific to an application where as machine.config contains settings to a computer. The Configuration system first searches settings in machine.config file & then looks in application configuration files, Web.config, can appear in multiple directories on an ASP.NET Web application server. Each Web.config file applies configuration settings to its own directory and all child directories below it. There is only Machine.config file on a web server.
