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

Posted By :Abhisek Panda     Posted Date :December 28, 2009    Points :10   Category :ASP.Net 
Using special validation controls such as Range Validator, Email Validator we can validate the controls in ASP.NET page.

You can also find related Interview Question to How do you validate the controls in an ASP.NET page?  below: 

Does ViewState is responsible for maintaining data across the Page Post Back for Postback controls (like textbox, dropdownlist) and non-postbackcontrols(like label)?

It is false. For NonPostback controls it is true but for postback controls, ASP.NET retrieves their values one by one from the HTTP request and copies them to the control values while creating the HTTP response. (More...)

How many WebPartManager controls should be on a page?

In order to have WebParts on a page there has to be just one WebPartManager control to manage all the WebParts on the page. (More...)

What are server controls?

ASP.NET server controls are components that run on the server and encapsulate user-interface and other related functionality. They are used in ASP.NET pages and in ASP.NET code-behind classes. (More...)

Explain the life cycle of an ASP .NET page.

Life cycle of ASP.Net Web Form
Page Request >> Start >> Page Init >> Page Load >> Validation >>
PostBack Event Handling >> Page Rendering >> Page Unload
Page Request - When the page is requested ASP.Net determines
whether the page is to be parsed and compiled or a cached verion
of the page is to be sent without running the page.
Start - Page propertied REQUEST and RESPONSE are SET, if the
page is pastback request then the IsPostBack property is SET and
in addition to this UICulture property is also SET.
Page Initilization - In this the UniqueID of each property is SET.
If the request was postback the data is not yet loaded from the
Page Load - If it was a postback request then the data gets loaded
in the control from the ViewState and control property are set.
Validation - If any control validation present, they are performed
and IsValid property is SET for each control.
PostBack Event Handling - If it was a postback request then any
event handlers are called.
Page Rendering - Before this the viewstate is saved from the page
and RENDER method of each page is called.
Page Unload - Page is fully rendered and sent to the client(Browser)
and is discarded. Page property RESPONSE and REQUEST are unloaded. (More...)

What is the difference between login controls and Forms authentication?

Login controls are an easy way to implement Forms authentication without having to write any code. For example, the Login control performs the same functions you would normally perform when using the FormsAuthentication class—prompt for user credentials, validate them, and issue the authentication ticket—but with all the functionality wrapped in a control that you can just drag from the Toolbox in Visual Studio. Under the covers, the login control uses the FormsAuthentication class (for example, to issue the authentication ticket) and ASP.NET membership (to validate the user credentials). Naturally, you can still use Forms authentication yourself, and applications you have that currently use it will continue to run. (More...)

How many types of validation controls are provided by ASP.NET ?

There are six main types of validation controls:-

RequiredFieldValidator: It checks whether the control have any value. It's used when you want the control should not be empty.

RangeValidator: It checks if the value in validated control is in that specific range.

CompareValidator: It checks that the value in controls should match the value in other control.

RegularExpressionValidator: When we want the control value should match with a specific regular expression.

CustomValidator: It is used to define UserDefined validation.

ValidationSummary: It displays summary of all current validation errors. (More...)

Where is image data loaded into ImageList controls actually stored in the project?

Each form has an associated resource file (with a .resx extension) where image data and localized strings are stored.You can see this by clicking the Show All Files icon in the Solution Explorer. (More...)

cross page posting in ASP.NET2.0???

When we have to post data from one page to another in application we used server.transfer method but in this the URL remains the same but in cross page posting there is little different there is normal post back is done but in target page we can access values of server control in the source page.This is quite simple we have to only set the PostBackUrl property of Button,LinkButton or imagebutton which specifies the target page.In target page we can access the PreviousPage property.And we have to use the @PreviousPageType directive.We can access control of PreviousPage by using the findcontrol method.When we set the PostBackURL property ASP.NET framework bind the HTML and Javascript function automatically. (More...)

What is a master page ?

1) A master page provides a framework in which the content of each page on a web site is presented. Master pages make it easy to create pages that have a consistent look.

2) The pages that provide the content that's displayed in a master page are called content pages .

3) The content of each content page is displayed in the master page's content placeholder (More...)

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

Use the Cookie. Discard Property which 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 users hard disk when a session ends.
it can be turned off by mentioning cookie state= false in web.config file (More...)

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

By setting the Cookie. Discard property false. (More...)

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