.net Interview

·        What is datagrid?

o    The DataGrid Web server control is a powerful tool for displaying information from a data source. It is easy to use; you can display editable data in a professional-looking grid by setting only a few properties. At the same time, the grid has a sophisticated object model that provides you with great flexibility in how you display the data.

·        34.              How do you hide the columns?

o    One way to have columns appear dynamically is to create them at design time, and then to hide or show them as needed. You can do this by setting a column’s “Visible” property.

·        35.              What are different types of directives in .NET?

o                      @Page

·                          @Control

·                          @Import

·                          @Implements

·                          @Register

·                          @Assembly

·                          @OutputCache

·                          @Reference

·        36.              What data type does the RangeValidator control support?

o                      Integer

·                          String.

·                          Date.

·        37.              What is cookies?

o    Cookies are small pieces of text, stored on the client’s computer to be used only by the website setting the cookies. This allows webapplications to save information for the user, and then re-use it on each page if needed

·        38.              How many classes can a single .NET DLL contain?

o    It can contain many classes.

·        39.              What methods are fired during the page load?

§  Init() - when the page is instantiated.

§  Load() - when the page is loaded into server memory.

§  PreRender() - the brief moment before the page is displayed to the user as HTML.

§  Unload() - when page finishes loading.

·        40.              What is the difference between Value Types and Reference Types?

o    Value Types uses Stack to store the data.

·        where as Reference type uses the Heap to store the data.

·        What is the difference between Server-side scripting and Client-side scripting?

o    Server side scripting means that all the script will be executed by the server and interpreted as needed. ASP doesn't have some of the functionality like sockets, uploading, etc.

·        Client side scripting means that the script will be executed immediately in the browser such as form field validation, clock, email validation, etc. Client side scripting is usually done in VBScript or JavaScript.

·        42.              How do you create a permanent cookie?

o    Permanent cookies are available until a specified expiration date, and are stored on the hard disk.So Set the 'Expires' property any value greater than DataTime.MinValue with respect to the current datetime. If u want the cookie which never expires set its Expires property equal to DateTime.maxValue.

·        43.              Which method do you use to redirect the user to another page without performing a round trip to the client?

o                      Server.Transfer

·                          Server.Execute.

·        44.              Which method do you use to redirect the user to another page without performing a round trip to the client?

o    Server.transfer

·        45.              What tag do you use to add a hyperlink column to the DataGrid?

o    < asp:HyperLinkColumn > < / asp:HyperLinkColumn>

·        46.              What is web.config file?

o    Web.config file is the configuration file for the Asp.net web application. There is one web.config file for one asp.net application which configures the particular application. Web.config file is written in XML with specific tags having specific meanings.It includes databa which includes connections,Session States,Error Handling,Security etc.

·        47.              What is the difference between in-proc and out-of-proc?

o    An Inproc is one which runs in the same process area as that of the client giving tha advantage of speed but the disadvantage of stability becoz if it crashes it takes the client application also with it.

·        Outproc is one which works outside the clients memory thus giving stability to the client, but we have to compromise a bit on speed.

·        How many languages .NET is supporting now?

o    When .NET was introduced it came with several languages. VB.NET, C#, COBOL and Perl, etc. The site DotNetLanguages.Net says 44 languages are supported.

·        50.              What is smart navigation?

o    The cursor position is maintained when the page gets refreshed due to the server side validation and the page gets refreshed.

·        51.              How do you validate the controls in an ASP .NET page?

o    Using special validation controls that are meant for this. We have Range Validator, Email Validator

·        52.              How do you turn off cookies for one page in your site?

o    Use Cookie.Discard property, Gets or sets the discard flag set by the server. When true, this property instructs the client application not to save the Cookie on the user's hard disk when a session ends.

·        53.              Which two properties are on every validation control?

o    We have two common properties for every validation controls:

·                          Control to Validate

·                          Error Message

·        54.              Which control would you use if you needed to make sure the values in two different controls matched?

o    CompareValidator is used to ensure that two fields are identical.

·        55.              What is the difference between HTTP-Post and HTTP-Get?

o    The GET method creates a query string and appends it to the script's URL on the server that handles the request.

·        The POST method creates a name/value pairs that are passed in the body of the HTTP request message.

·        56.              What is strong-typing versus weak-typing?

o    Strong typing implies that the types of variables involved in operations are associated to the variable, checked at compile-time, and require explicit conversion

·        Weak typing implies that they are associated to the value, checked at run-time, and are implicitly converted as required.

·        What is boxing and unboxing?