validations

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In computer science, data validation is the process of ensuring that a program operates on clean, correct and useful data. It uses routines, often called "validation rules" or "check routines", that check for correctness, meaningfulness, and security of data that are input to the system. The rules may be implemented through the automated facilities of a data dictionary, or by the inclusion of explicit application program validation logic.

We have differnt validation controls in ASP.Net;

RequiredFieldValidator

CompareValidator

RangeValidator

RegularExpressionValidator

CustomValidator

ValidationSummary

http://www.beansoftware.com/ASP.NET-Tutorials/Validation-In-ASP.NET.aspx

In windows applciation you can do validation for textboxes on events like; KeyPress, KeyDown, KeyUp etc as per your requirement.... Also you can use ErrorProvider to show error in proper format.....

http://www.codeproject.com/KB/validation/validationprovider.aspx

hi,

Validation Server Control	Description
CompareValidator	Compares the value of one input control to the value of another input control or to a fixed value
CustomValidator	Allows you to write a method to handle the validation of the value entered
RangeValidator	Checks that the user enters a value that falls between two values
RegularExpressionValidator	Ensures that the value of an input control matches a specified pattern
RequiredFieldValidator	Makes an input control a required field
ValidationSummary	Displays a report of all validation errors occurred in a Web page

http://www.codeproject.com/KB/validation/aspnetvalidation.aspx

http://www.theserverside.net/tt/articles/showarticle.tss?id=Validators

http://ashishware.com/ASPValid.shtml