CompareValidator Control in asp.net

Definition 

The CompareValidator control allows you to compare the value entered by the user into an input control such as TextBox,TextArea,etc..
syntax :

<asp:CompareValidator
     id="ProgrammaticID"
     ControlToValidate="Programmatic ID of Server Control to Validate"
     ValueToCompare="value"
     ControlToCompare="value"  
     Type="DataType" 
     Operator="Operator Value" 
     ErrorMessage="Message to display in ValidationSummary control"
     Text="Message to display in control"  
     ForeColor="value"
     BackColor="value"  
     runat="server" > 
</asp:CompareValidator>

Properties
For Campare Validator:


 


  

Property

  

Description

 

  

BackColor

  

This Property is use to change the background color.

 

  

ControlToCompare

  

The name of the control which is going to compare with

 

  

ControlToValidate

  

The id of the control to validate 

 

  

Display

  

The display behavior for the validation control. Legal values
  are:

 

          None – does not
  display the validation and only displayed in the          ASP.NET Validation Summary control.

          Static – displays the validation
  message if check fails. The space of the control is reserved even if the
  check passes.

           Dynamic – displays the validation
  message if check fails. The space of the control is not reserved if the check
  passes.

 

  

EnableClientScript

  

Boolean value to specify if client-side validation is enabled
  or disabled.

 

  

Enabled

  

Property to set a Boolean value to specify if validation
  control is enabled or disabled.

 

  

ErrorMessage

  

The text to display in the Validation Summary control when
  validation fails. Note: This text will also be displayed in
  the validation control if the Text property is not set

 

  

ForeColor

  

The foreground color of the control

 

  

id

  

A unique id for the control

 

  

IsValid

  

A Boolean value that indicates whether the control specified by
  ControlToValidate is determined to be valid

 

  

Operator

  

The type of comparison to perform. The operators are:

NotEqual
DataTypeCheck
Equal
GreaterThan
GreaterThanEqual
LessThan
LessThanEqual


 

  

runat

  

Specifies that the control is a server control. Must be set to
  "server"

 

  

Text

  

The message to display when validation fails

 

  

Type

  

Specifies the data type of the values to compare. The types are:

Currency
Date
Double
Integer
String


 

  

ValueToCompare

  

A specified value to compare with

 



Example:
<form runat="server">
<table>
   <tr valign="top">
     <td colspan="4"><h4>Compare two values</h4></td>
   </tr> 
   <tr valign="top">
     <td><asp:TextBox id="txt01" runat="server" /></td>
     <td> = </td>
     <td><asp:TextBox id="txt02" runat="server" /></td>
     <td><asp:Button Text="Validate" runat="server" /></td>
   </tr>
</table>
<br />
<asp:CompareValidator
id="compval" 
Display="dynamic"
ControlToValidate="txt01" 
ControlToCompare="txt02" 
ForeColor="red" 
BackColor="yellow" 
Type="String"
EnableClientScript="false" 
Text="Validation Failed!" 
runat="server" />
</form>