Validation In ASP.Net

It is a technology for building Powerful and Dynamic application.
It is a Part of .Net Framework.
Basic HTML and CSS Knowledge is preferable.
.NET language is a Independent which means you can use any .Net supported language to make a .Net applications.
What is mean by VWD?
Visual Web Developer
Validation in ASP.Net
Now a days, Validation is a important in the Window application and Web Application.In web application ,validation is a separate control.
Types of Validation:
1)RequiredFieldVaildator
It is a very useful and very easy.You can use it in the Textbox validation .

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <%--This is aTitle Part--%>

<%--This is a Controls declartation--%>

Note: Use Comment a line : Select a line and Press Ctrl+k,Ctrl+c
Use Uncomment a line : Select a line and Press Ctrl+u,Ctrl+c
2) Comparevalidator: -- It is useful for somecase.It is very useful to compare a two values of two controls

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <%--This is aTitle Part--%>

<%--This is a Controls declartation--%> First Value:

Secound Value:

Operator: Lessthan,LessthanEqual,Greater,Greaterthan,Equal,NotEqual,DataTypeCheck.
type: currency,Date,Integer,Double,String
try to change the Operator and type based on your scenario
3)RangeValidator:
It is very useful for Date range Specification that user enter within minimumvalue and maximum value.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <%--This is aTitle Part--%>

<%--This is a Controls declartation--%> First Value: