Defination Of
Validation:-
Validation is most part of any web application. It is validate the user input
data. It is used to implement page level validity of data entered in
the server controls.
There are two type
of validation here:-
A-Client Side Validation
B-Server Side
Validation
A-Client Side Validation:-It is good client
side validation. Client side validation is dependent on the browser and also scripting language.
B-Server Side Validation:- server
validation will work always whether client validation is executed or not.
There are six types of validation
controls in ASP.NET
- Required
Field Validation Control
- Compare
Validator Control
- Range
Validator Control
- Regular
Expression Validator Control
- Custom
Validator Control
- Validation
Summary
Explain
Members:-
Members
|
Describe to members
|
A. EnableClientScript
|
A. Indicates whether
client side validation will take.
|
B. ControlToValidate
|
B. Indicates the
input control to validate.
|
C. Enabled
|
C. Enables or
disables the validator.
|
D. Display
|
D.Indicates how
the error message is shown.
|
E. Text
|
E. Error text to
be shown if validation fails.
|
F. ErrorMessage
|
F. Indicates
error string.
|
G. SetFocusOnError
|
G. It indicates
whether in case of an invalid control, the focus should switch to the related
input control.
|
H. IsValid
|
H. Indicates
whether the value of the control is valid.
|
I. Validate()
|
I. This method
revalidates the control and updates the IsValid property.
|
J. ValidationGroup
|
J. The logical
group of multiple validators, where this control belongs.
|
1-Define
Required Field Validation Control :-
It is very easy and
useful validation .You can use it to make sure that the user has entered
something in a Textbox control.
For Example:-
<form id="form1" runat="server">
Last Name:<br />
<asp:TextBox runat="server" id="txtLastName" />
<asp:RequiredFieldValidator runat="server" id="reqName" controltovalidate="txtName" errormessage="Please enter your Last name!" />
<br /><br />
<asp:Button runat="server" id="btnsave" text="Submit" />
</form>
Last Name
|
|
Please Enter Last Name
|
2-Define Compare Validator Control:-
Compare
Validator Control is used to compares the value of one input
control to the value of another input control or to a fixed value and used
between to input value in textbox.
For Example:-
Password :<br />
<asp:TextBox runat="server" id="txtPass" /><br /><br />
Retype Password:<br />
<asp:TextBox runat="server" id="txtRtyPass" /><br />
<asp:CompareValidator runat="server" id="PAAS_Number" controltovalidate=" txtPass " controltocompare=" txtRtyPass " errormessage="The Password should be Retype
Password is Same!"
/><br />
Password
|
Reset*123
|
|
|
Retype Password
|
Reset*1234
|
|
|
The
Password should be Retype Password is Same
|
3-Define RangeValidator :-
The Range Validator Server Control which
checks to see if a control value is within a valid range. The attributes that
are necessary to this control are: big value(It specifies the minimum value of the
rang), small(It specifies the maximum value of the range.) value,
and Type(Currency, Date, Double, Integer, and String).
Date:<br />
<asp:TextBox runat="server" id="txtDate" />
<asp:RangeValidator runat="server" id="Daterang" controltovalidate="txtDate" type="Date" minimumvalue="01-01-2018" maximumvalue="31-12-2018" errormessage="Please enter a valid date within
2018!"
/>
<br /><br />
For
Example:
Date
|
31-02-2018
|
Please Enter a valid date within 2018
|
4-Define Regular Expression Validator:-
The
Regular Expression Validator permit to validating the input text by matching
against a pattern of a regular expression. The regular expression is set in the
Validation Expression property and used to identify simple and
complex characters sequence that would otherwise require writing code to perform.
For Exmaple of Email Id:-
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" Style="top: 334px;
left: 400px; position: absolute; height: 20px; width: 150px"
ErrorMessage="RegularExpressionValidator" ControlToValidate="txt5"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
Enter Email_ID
|
princes.com
|
Please Enter a valid Email_id
|
- Custom Validator Control
5-Define Custom Validator
Control:-
The Custom Validator control permitted
to writing application specific custom validation routines for both the client
side and the server side validation. The control permit to validate both client
side and server side, where the server side approach is probably the most
powerful. Of course, doing server side validation requires a post back to
validate, but in most cases, it’s not really issue.
For Example:
Custom text:<br />
<asp:TextBox runat="server" id="customtxt" />
<asp:CustomValidator runat="server" id="cusstomcus" controltovalidate="txtCustom" onservervalidate="cusCustom_ServerValidate" errormessage="The text must be exactly 7
characters long!"
/>
<br /><br />
6-Define Validation Summary Control:-
It Defined validation
summary control does not perform any validation but shows a summary of all
errors in the page. The summary displays the values of the ErrorMessage
property of all validation controls that failed validation.
<asp:ValidationSummary ID="valsum1" runat="server"
DisplayMode = "BulletList" ShowSummary = "true" HeaderText="Errors:" />
