ASP. NET validation control

First, RequiredFieldValidator

Description: Makes an associated input control a required field.

A feature RequiredFieldValidator control that is commonly used to verify that the text input box is empty. When a user submits data from a Web page to the server side, the system automatically checks whether the input of the control being validated is empty, and if it is empty, the RequiredFieldValidator control displays a hint in the Web page.

Example:

<asp:requiredfieldvalidator id= "RequiredFieldValidator1" runat= "Server" controltovalidate= "Txtname" Errormessage= "Please enter your name! "></asp:RequiredFieldValidator>

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Properties	description
controltovalidate	This property gets or sets the input to validate Control
display	This property gets or sets the display behavior of the error message in the validation control
enableviews Tate	This property gets or sets a value that indicates whether the server control maintains its own view state and the view state of any child controls it contains to the client that made the request
Errormessag E	This property gets or sets the text of the error message displayed in the ValidationSummary control when validation fails
ForeColor	the genus Sex Gets or sets the color of messages displayed after validation fails
IsValid	This property gets or sets a value that indicates whether the associated input control passes validation
setfocusonerror	This property gets or sets a value that indicates whether the focus is set to the control specified by the ControlToValidate property when validation fails
text	This property gets or sets the text that is displayed in the validation control when validation fails
Page	This property gets the server control that contains the Reference to page instance
Visible	This property gets or sets a value that indicates whether the server control is rendered as UI on the page

Second, CompareValidator

Description: Compares the value of a user input control to a value entered into another space or to a Changshu value

The CompareValidator control, also known as a comparison validation control, is primarily used to compare the value of an input control to a specified constant value or other input control by a specified comparison operator (>, <, =, <>, >=, and <=, and so on). To determine whether a two value matches. In addition, the CompareValidator control can be used to determine whether a user-entered value can be converted to the data type specified by its Type property.

Example:

<asp:comparevalidator id= "CompareValidator1" runat= "Server" controltocompare= "Txta" controltovalidate= "TXTB" Errormessage= "value must be greater than B value" ></asp:CompareValidator>

Property	Describe
BackColor	The background color of the CompareValidator control.
ControlToCompare	The input control to compare with the input control being validated.
ControlToValidate	The ID of the input control to validate.
Display	Validates the display behavior of the error message in the control. The legal values are: None validation messages are never displayed inline. Static allocates space in the page layout to display validation messages. Dynamic if validation fails, the space used to display the validation message is dynamically added to the page.
EnableClientScript	Boolean value that specifies whether client-side validation is enabled.
Enabled	A Boolean value that specifies whether the validation control is enabled.
ErrorMessage	The text that is displayed in the ValidationSummary control when validation fails. Note: If the Text property is not set, it will be displayed in the validation control.
ForeColor	The foreground color of the control.
Id	The unique ID of the control.
IsValid	A Boolean value that indicates whether the input control specified by ControlToValidate is validated.
Operator	The type of comparison operation to perform. The operators are: Equal GreaterThan Greaterthanequal LessThan Lessthanequal NotEqual DataTypeCheck
Runat	Specifies that the control is a server control. Must be set to "server".
Text	The message that is displayed when validation fails.
Type	Specifies the data type of the value to be compared. Types are: Currency Date Double Integer String
ValueToCompare	A constant value to compare to the value entered by the user into the validated input control.

Third, RangeValidator

Description: Checks whether the value of the input control is within the specified range

Example:

1	<asp:RangeValidator ID="RangeValidator3"runat="server" ControlToValidate="txtAge" ErrorMessage="RangeValidator" MaximumValue="60"MinimumValue="18"></asp:RangeValidator>

　　

Properties	Description
BackColor	RangeValidator the background color of the control
ControlToValidate	The ID of the control to validate
Display	Validates the display behavior of the control. The valid values are: None-Verify that messages are never displayed inline. Static-Allocates space in the page layout to display the validation message. dynamic-if validation fails, the space used to display the validation message is dynamically added to the page.
EnableClientScript	Boolean value that specifies whether client-side validation is enabled.
Enabled	A Boolean value that specifies whether the validation control is enabled.
ErrorMessage	The text that is displayed in the ValidationSummary control when validation fails. Note: If you do not set the Text property, it will also appear in the validation control.
ForeColor	The foreground color of the control.
Id	The unique ID of the control.
IsValid	A Boolean value that indicates whether the associated input control passed validation.
MaximumValue	Specifies the maximum value of the input control.
MinimumValue	Specifies the minimum value for the input control.
Runat	Specifies that the control is a server control. Must be set to "server".
Type	Specifies the data type of the value to be detected. Types are: Currency Date Double Integer String
Text	The message that is displayed when validation fails.

Iv. RegularExpressionValidator

Description: Used to verify that the input value matches the pattern specified by the regular expression.

Example:

<asp:regularexpressionvalidator id= "RegularExpressionValidator1" runat= "Server" controltovalidate= "Txtemail" Errormessage= "Mailbox format is incorrect" validationexpression= "\w+ ([-+. '] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) * "></asp:RegularExpressionValidator>

Properties	Description
BackColor	RangeValidator the background color of the control
ControlToValidate	The ID of the control to validate
Display	Validates the display behavior of the control. The valid values are: None-Verify that messages are never displayed inline. Static-Allocates space in the page layout to display the validation message. dynamic-if validation fails, the space used to display the validation message is dynamically added to the page.
EnableClientScript	Boolean value that specifies whether client-side validation is enabled.
Enabled	A Boolean value that specifies whether the validation control is enabled.
ErrorMessage	The text that is displayed in the ValidationSummary control when validation fails. Note: If you do not set the Text property, it will also appear in the validation control.
ForeColor	The foreground color of the control.
Id	The unique ID of the control.
IsValid	A Boolean value that indicates whether the associated input control passed validation.
Runat	Specifies that the control is a server control. Must be set to "server".
Text	The message that is displayed when validation fails.
ValidationExpression	Specifies the regular expression that validates the input control. On both the client and the server, the syntax of the expression is different.

Wu, CustomValidator

Description: User-defined validation can be performed on the input control.

Example:

Liu, ValidationSummary
Description: Used to display a summary of all validation errors inline in a Web page, message box, or both.
Example:

 
 
 
  
  
 
   
 
    
1
 
    
<asp:ValidationSummary ID="ValidationSummary1"runat="server" HeaderText="发生了以下错误："/>
 
   
 
  
 
 
 
　　

 
 
 
  
  
 
   
 
    
Properties
 
    
Description
 
   
 
   
 
    
DisplayMode
 
    
How to display the summary. Valid values are:
 
     
 
      
BulletList
 
      
List
 
      
Singleparagraph
 
     
 
   
 
   
 
    
EnableClientScript
 
    
Boolean value that specifies whether client-side validation is enabled.
 
   
 
   
 
    
Enabled
 
    
A Boolean value that specifies whether the validation control is enabled.
 
   
 
   
 
    
ForeColor
 
    
The foreground color of the control.
 
   
 
   
 
    
HeaderText
 
    
The caption text in the ValidationSummary control.
 
   
 
   
 
    
Id
 
    
The unique ID of the control.
 
   
 
   
 
    
Runat
 
    
Specifies that the control is a server control. Must be set to "server".
 
   
 
   
 
    
ShowMessageBox
 
    
A Boolean value that indicates whether the validation summary is displayed in a message box.
 
   
 
   
 
    
ShowSummary
 
    
Boolean value that specifies whether the validation summary is displayed.
 
   
 
  
 
 
 
ASP. NET validation control