ASP.NET interview questions: – How many types of validation controls are provided by ASP.NET? How can we create custom controls in 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.

Creating custom controls in ASP.NET: –

User controls are created using .ASCX in ASP.NET. After .ASCX file is created you need to two things in order that the ASCX can be used in project: –

  • Register the ASCX control in page using the <percentage@ Register directive.Example

<%@ Register tag prefix=”Accounting” Tag name=”footer” Src=”Footer.ascx” %>

  • Now to use the above accounting footer in page you can use the below directive.

<Accounting: footer runat=”server” />

Also see following ASP.NET interview questions video on Authentication and Authorization: –

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