ASP.NET Mobile CompareValidator Control

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# ASP.NET Mobile CompareValidator Control

Complete ASP.NET Mobile Reference

## Definition and Usage

The CompareValidator control is used to compare the value of one input control to the value of another input control or to a fixed value.

Note: The validation will not fail if the input control is empty. Use the RequiredFieldValidator control to make the field required.

## Properties

Property | Value | Description
--- | --- | ---
Alignment | left center right | Optional. How to align the control
BackColor | rgb(x,x,x) #xxxxxx colorname | Optional. A background color for the control
ControlToCompare | id_of_control | Optional. The name of the control to compare with
ControlToValidate | id_of_target_control | Optional. The id of the control to validate

Display

None
Static
Dynamic

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

- None (the control is not displayed. Used to show the error message only in the ValidationSummary control)
- Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation
- Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation

Dynamic is default

ErrorMessage | errortext_for_summary | Optional. The text to display in the ValidationSummary control when validation fails
ForeColor | rgb(x,x,x) #xxxxxx colorname | Optional. A foreground color for the control
Font-Bold | false true | Optional. Specifies whether or not the text in the control should be bold
Font-Italic | false true | Optional. Specifies whether or not the text in the control should be italic
Font-Name | fontname | Optional. Specifies the font name of the text in the control
Font-Size | normal small large | Optional. Specifies the font size of the text in the control
id | unique_name | Optional. A unique id for the control

Operator

DataTypeCheck
Equal
GreaterThan
GreaterThanEqual
LessThan
LessThanEqual
NotEqual

Optional. The type of comparison to perform

runat | "server" | Required. Specifies that the control is a server control
StyleReference | name_of_style_element | Optional. Specifies a reference to a style to be applied to the control
Text | errortext | Optional. The message to display when validation fails
Type | Currency Date Double Integer String | Optional. Specifies the data type of the values to compare
ValueToCompare | value | Optional. A specified value to compare with
Wrapping | wrap nowrap | Optional. Specifies whether or not the text in the control should wrap

### Example 1

The following example contains two forms in an .aspx file. The first form has a label with the text "Age?", an input box to input the age, and a submit button. The second page is activated by the submit button on the first page, and displays a response. If the input value validates as an error, an error message is displayed:

    <%@ 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>

Complete ASP.NET Mobile Reference

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