CompareValidator.ControlPropertiesValid Method
.NET Framework 3.0
This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
Checks the properties of the control for valid values.
Namespace: System.Web.UI.WebControlsAssembly: System.Web (in system.web.dll)
| Exception type | Condition |
|---|---|
| ControlToValidate and ControlToCompare have the same ID. | |
HttpException | The value of a target property cannot be converted to the expected Type. |
The following code example demonstrates how to override the ControlPropertiesValid method in a custom server control so that it always returns the value of the visible property, as long as the ControlToCompare property of the CompareValidator control is on the page and contains validation properties.
Security Note: |
|---|
| This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio). |
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page language="VJ#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom CompareValidator - ControlPropertiesValid - VJ# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// Run the Page Validate method in order to force
// the CompareValidate to show it's error message.
get_Page().Validate();
} //Page_Load
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom CompareValidator - ControlPropertiesValid - VJ# Example</h3>
<asp:TextBox id="TextBox1" runat="server" Text="123"></asp:TextBox><br />
<aspSample:CustomCompareValidatorControlPropertiesValid
id="CompareValidator1"
runat="server"
Display="Dynamic"
ErrorMessage="The value of TextBox1 must be '456'."
ControlToValidate="TextBox1"
ValueToCompare="456" /><br />
<asp:Button id="Button1" runat="server" Text="Button" />
</form>
</body>
</html>
...
package Samples.AspNet.JSL.Controls;
public class CustomCompareValidatorControlPropertiesValid
extends System.Web.UI.WebControls.CompareValidator
{
protected boolean ControlPropertiesValid()
{
// Determine whether the ControlToValidate is on the page
// and contains a validation properties.
super.CheckControlValidationProperty(this.get_ControlToValidate(),
"ControlToValidate");
// If the control is visible, then control is valid and is ready
// for validation.
System.Web.UI.Control control =
this.FindControl(this.get_ControlToValidate());
return control.get_Visible();
} //ControlPropertiesValid
} //CustomCompareValidatorControlPropertiesValid
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