Validation Controls are used to validate the data entered by a user.
Validation（检测）控件用于检测用户输入的数据

Validation Controls
Validation（检测）控件

Validation controls are used to validate the data entered by a user.
Validation（检测）控件用于检测用户输入的数据

Validation controls allow you to validate an input control (like a TextBox), and display a message when validation fails.
Validation（检测）控件允许你检测一个输入控件（像一个文本框），并在检测失效时显示一条信息。

Each validation control performs a specific type of validation (like validating against a specific value or a range of values).
每项检测控件执行了一个指定类型的检测（像检测一个特定值或一定范围内的所有值）

By default, page validation is performed when a command control is clicked. You can prevent validation when a control is clicked by setting the CausesValidation property to false.
默认状态下，当命令控件被点击时页面检测会被执行。通过设置CausesValidation（引起检测）属性为假，在控件被点击时检验就不会执行。

Validating Input
检验输入

This page has two forms:
这页有两个窗口
 

<%@ Page
Inherits=
"System.Web.UI.MobileControls.MobilePage"%>
<%@ Register
TagPrefix="Mobile"

Namespace="System.Web.UI.MobileControls"
Assembly="System.Web.Mobile" %>

<script runat="server">

Sub Page2(Sender as Object,E as EventArgs)
If Page.IsValid Then
  ActiveForm=f2
  text2.Text="You are " & age.text & " years old"

end if
End Sub

</script>

<Mobile:Form id="f1" runat="server">

<Mobile:CompareValidator runat="server"
  ControlToValidate="age"

  Type="Integer"
  ValueToCompare="18"
  Operator="GreaterThanEqual">
You must be at least 18
</Mobile:CompareValidator>

<Mobile:Label runat="server">Age?</Mobile:Label>

<Mobile:TextBox id="age" runat="server" />
<Mobile:Command OnClick="Page2" runat="server">
Submit</Mobile:Command>

</Mobile:Form>

<Mobile:Form id="f2" runat="server">
<Mobile:Label id="text2" runat="server" />

</Mobile:Form>

The first form has a label with the text "Age?", an input box to input the age, and a submit button.
第一个窗口有文本为"Age?"的一个标签，一个用于输入年龄的输入框，和一个提交按钮

The second page is activated by the submit button on the first page, and displays a response.
第二页被第一页的提交按钮激活，显示了回应。

If the input validates as error, an error message is displayed.
如果输入验证为错误，就会显示错误信息

When the application runs on a mobile device, the two pages will display like this:
当程序在手机部件运行时，两页会这样显示：

Form 1  窗口1

Form 2  窗口2

The ValidationSummary Control
ValidationSummary（验证摘要）控件

The previous example used a CompareValidator control to validate an input field. The field to validate was defined by the attribute ContolToValidate.
前面的例子用了CompareValidator控件检验一个输入区域。检验区域是由ContolToValidate（检验控件）.属性定义的

You can also use a ValidationSummary control with the attribute FormToValidate, to validate all the input of a form.
你也可以用有FormToValidate（检验窗口）属性的ValidationSummary（检验摘要）控件，来检验窗口的所有输入。

This way you can display a summary of errors instead of one error at the time.
用这种方法你可以显示所有错误的摘要而不是只显示一个错误。

Validation Controls Reference
检验控件参考

For a full control reference, including properties methods, events, and more examples, please refer to the "Mobile Reference" page.
为了解完整的控件参考，包括属性方法，事件和更多例子，请看"Mobile Reference"。