If you want to understand how RangeValidator works, by example, you can develop a simple test web page. This page uses a single Button web control, two TextBox controls and a RangeValidator control that validates the first text box. If validation fails, the RangeValidator control displays an error message, so you should place this control immediately next to the TextBox it’s validating. The second text box does not use any validation.

The next picture shows the appearance of the page after a failed validation attempt.




The markup for this page defines a RangeValidator control, sets the error message, identifies the control that will be validated, and requires an integer from 32 to 78. These properties are set in the .aspx file, but they could also be configured in the event handler for the Page.Load event. The Button automatically has its CauseValidation property set to true, because this is the default.


A number (32 to 78):


<asp:TextBox id=”validatedBox” runat=”server” />
    <asp:RangeValidator id=”RangeValidator” runat=”server”
    ErrorMessage=”This Number Is Not In The Range”
    ControlToValidate=”validatedBox“
    MaximumValue=”78” MinimumValue=”32“
    ForeColor=”Red” Font-Bold=”true”
    Type=”Integer” />

<br /><br />


Not validated:


<asp:TextBox id=”notValidatedBox” runat=”server” /><br /><br />
<asp:Button id=”cmdOK” runat=”server” Text=”OK” OnClick=”cmdOK_Click” />
<br /><br />
<asp:Label id=”lblMessage” runat=”server” EnableViewState=”False” />


An additional Label control is used to report when the page has been posted back and the event handling code has executed. Its EnableViewState property is disabled to ensure that it will be cleared every time the page is posted back.


The next code lines manage responds to the button click:


protected void cmdOK_Click(Object sender, EventArgs e)
{
lblMessage.Text = “cmdOK_Click event handler executed.”;
}


When you open the page for the first time in modern browsers, the error message is is hidden. But if you type an invalid number (validation will succeed for an empty value) and press the Tab key to move to the second text box, an error message will appear automatically next to the offending control. This is because ASP.NET adds a special JavaScript function that detects when the focus changes. The actual implementation of this JavaScript code is somewhat complicated, but ASP.NET handles all the details for you automatically. As a result, if you try to click the OK button with an invalid value in validatedBox, your actions will be ignored, and the page won’t be posted back.


In case if you want to see what will happen on a browser which does not support client-side validation (i.e. down-level browser), you should set the RangeValidator.EnableClientScript property to false, and rerun the page. Now error messages won’t appear dynamically as you change focus. However, when you click the OK button, the page will be returned from the server with the appropriate error message displayed next to the invalid control.


If you want to ensure that your web page behaves the same in modern and older browsers, you must specifically abort the event code if validation hasn’t been performed successfully. The next code lines correct this problem:


protected void cmdOK_Click(Object sender, EventArgs e)
{
// Abort the event if the control isn’t valid.
if (!RangeValidator.IsValid) return;
lblMessage.Text = “cmdOK_Click event handler executed.”;
}


When the page page contains multiple validation controls, you should follow different approach. In ASP.NET world every web form provides its own IsValid property. This property will be false if any validation control has failed. It will be true if all the validation controls completed successfully. If validation was not performed (for example, if the validation controls are disabled or if the button has CausesValidation set to false), you’ll get an HttpException when you attempt to read the IsValid property. In this case the next code is better:


protected void cmdOK_Click(Object sender, EventArgs e)
{
// Abort the event if any control on the page is invalid.
if (!Page.IsValid) return;
lblMessage.Text = “cmdOK_Click event handler executed.”;
}


Reasons why you must trust ASPHostPortal.com


Every provider will tell you how they treat their support, uptime, expertise, guarantees, etc., are. Take a close look. What they’re really offering you is nothing close to what
ASPHostPortal does. You will be treated with respect and provided the courtesy and service you would expect from a world-class web hosting business.

You’ll have highly trained, skilled professional technical support people ready, willing, and wanting to help you 24 hours a day. Your web hosting account servers are monitored from three monitoring points, with two alert points, every minute, 24 hours a day, 7 days a week, 365 days a year. The followings are the list of other added- benefits you can find when hosting with us:


-
DELL Hardware
Dell hardware is engineered to keep critical enterprise applications running around the clock with clustered solutions fully tested and certified by Dell and other leading operating system and application providers.
- Recovery Systems
Recovery becomes easy and seamless with our fully managed backup services. We monitor your server to ensure your data is properly backed up and recoverable so when the time comes, you can easily repair or recover your data.

- Control Panel
We provide one of the most comprehensive customer control panels available. Providing maximum control and ease of use, our Control Panel serves as the central management point for your ASPHostPortal account. You’ll use a flexible, powerful hosting control panel that will give you direct control over your web hosting account. Our control panel and systems configuration is fully automated and this means your settings are configured automatically and instantly.

- Excellent Expertise in Technology
The reason we can provide you with a great amount of power, flexibility, and simplicity at such a discounted price is due to incredible efficiencies within our business. We have not just been providing hosting for many clients for years, we have also been researching, developing, and innovating every aspect of our operations, systems, procedures, strategy, management, and teams. Our operations are based on a continual improvement program where we review thousands of systems, operational and management metrics in real-time, to fine-tune every aspect of our operation and activities. We continually train and retrain all people in our teams. We provide all people in our teams with the time, space, and inspiration to research, understand, and explore the Internet in search of greater knowledge. We do this while providing you with the best hosting services for the lowest possible price.

- Data Center

ASPHostPortal modular Tier-3 data center was specifically designed to be a world-class web hosting facility totally dedicated to uncompromised performance and security
- Monitoring Services
From the moment your server is connected to our network it is monitored for connectivity, disk, memory and CPU utilization – as well as hardware failures. Our engineers are alerted to potential issues before they become critical.

- Network
ASPHostPortal has architected its network like no other hosting company. Every facet of our network infrastructure scales to gigabit speeds with no single point of failure.

- Security
Network security and the security of your server are ASPHostPortal’s top priorities. Our security team is constantly monitoring the entire network for unusual or suspicious behavior so that when it is detected we can address the issue before our network or your server is affected.

- Support Services
Engineers staff our data center 24 hours a day, 7 days a week, 365 days a year to manage the network infrastructure and oversee top-of-the-line servers that host our clients’ critical sites and services.