QuestPond’s Interview Questions & Answers on ASP.NET

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 is 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 lengths.

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 User Defined validation.

Validation Summary
It displays summary of all current validation errors on an ASP.NET page.

How can we force all the validation control to run?

Page.Validate

How can we check if all the validation control are valid and proper?

Using the Page.IsValid() property you can check whether all the validation are done.

If client side validation is enabled, will server side code still run ?

When client side validation is enabled server emit’s JavaScript code for the custom validators. However, note that does not mean that server side checks on custom validators do not execute. It does this redundant check two times, as some of the validators do not support client side scripting.

Which JavaScript file is referenced for validating the validators at the client side?

WebUIValidation.js JavaScript file installed at “aspnet_client” root IIS directory is used to validate the validation controls at the client side

How to disable client side script in validators?

Set ‘EnableClientScript’ to false.

How can I show the entire validation error message in a message box on the client side?

In validation summary set “ShowMessageBox” to true.

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