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what are the Validation controls in Asp.Net?

Posted By :Narayanan     Posted Date :October 24, 2011    Points :40   Category :ASP.Net 
Customs Validator,
Compare Validator,
Range Validator,
RegularExpressionValidator,
RequiredFieldValidator,
ValidationSummary

You can also find related Interview Question to what are the Validation controls in Asp.Net?  below: 

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...)

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. Example
TxtCustomerCode should not be more than eight length.

CompareValidator
It checks that the value in controls should match some specific value. Example Textbox
TxtPie should be equal to 3.14.

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.
Note:- It's rare that some one will ask step by step all the validation controls. Rather they
will ask for what type of validation which validator will be used. Example in one of the
interviews i was asked how you display summary of all errors in the validation
control...just uttered one word Validation summary. (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...)

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...)

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...)

Should validation (did the user enter a real date) occur server-side or client-side? Why?

  
Validation will be done in both sides i.e., at the server side and client side. Server side validation will be done even though client side validation performed on the code because of proper
security reasons. (More...)

Name two properties common in every validation control?

  
ControlToValidate property and Text property are two properties that are common in every validation control. (More...)

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...)

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