Asp.Net Interview Questions and Answers

Answer - 91 : -   Aspnet_regiis.exe is The ASP.NET IIS Registration tool allows an administrator or installation program to easily update the script maps for an ASP.NET application to point to the ASP.NET ISAPI version associated with the tool. The tool can also be used to display the status of all installed versions of ASP. NET, register the ASP.NET version coupled with the tool, create client-script directories, and perform other configuration operations.  When multiple versions of the .NET Framework are executing side-by-side on a single computer, the ASP.NET ISAPI version mapped to an ASP.NET application determines which version of the common language runtime is used for the application. The tool can be launched with a set of optional parameters. Option "i" Installs the version of ASP.NET associated with Aspnet_regiis.exe and updates the script maps at the IIS metabase root and below. Note that only applications that are currently mapped to an earlier version of ASP.NET are affected

Answer - 92 : -   The process in which a Web page sends data back to the same page on the server.

Answer - 93 : -   ViewState is the mechanism ASP.NET uses to keep track of server control state values that don't otherwise post back as part of the HTTP form. ViewState Maintains the UI State of a Page   ViewState is base64-encoded.  It is not encrypted but it can be encrypted by setting EnableViewStatMAC="true" & setting the machineKey validation type to 3DES.  If you want to NOT maintain the ViewState, include the directive < %@ Page EnableViewState="false" % > at the top of an .aspx page or add the attribute EnableViewState="false" to any control.

Answer - 94 : -   The DataGrid provides the means to display a group of records from the data source (for example, the first 10), and then navigate to the "page" containing the next 10 records, and so on through the data. Using Ado.Net we can explicit control over the number of records returned from the data source, as well as how much data is to be cached locally in the DataSet. 1.Using DataAdapter.fill method give the value of 'Maxrecords' parameter  (Note: - Don't use it because query will return all records but fill the dataset based on value of 'maxrecords' parameter). 2.For SQL server database, combines a WHERE clause and a ORDER BY clause with TOP predicate. 3.If Data does not change often just cache records locally in DataSet and just take some records from the DataSet to display.

Answer - 95 : -   The various security methods which IIS provides are a) Authentication Modes b) IP Address and Domain Name Restriction c) DNS Lookups DNS Lookups d) The Network ID and Subnet Mask e) SSL

Answer - 96 : -   The web is state-less protocol, so the page gets instantiated, executed, rendered and then disposed on every round trip to the server. The developers code to add "statefulness" to the page by using Server-side storage for the state or posting the page to itself. When require to persist and read the data in control on webform, developer had to read the values and store them in hidden variable (in the form), which were then used to restore the values. With advent of .NET framework, ASP.NET came up with ViewState mechanism, which tracks the data values of server controls on ASP.NET webform. In effect,ViewState can be viewed as "hidden variable managed by ASP.NET framework!". When ASP.NET page is executed, data values from all server controls on page are collected and encoded as single string, which then assigned to page's hidden atrribute  "< input type=hidden >" Question - 100 : - What data types do the RangeValidator control support?

Answer - 100 : - Integer, String, and Date.