ASP.NET Mobile RequiredFieldValidator Control

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# ASP.NET Mobile RequiredFieldValidator Control

Complete ASP.NET Mobile Reference

## Definition and Usage

The RequiredFieldValidator control is used to make an input control a required field.

With this control, the validation fails if the input value does not change from its initial value. By default, the initial value is null.

Note: Leading and trailing spaces of the input value are removed before validation.

Note: The InitialValue property does not set the default value for the input control. It indicates the value that you do not want the user to enter in the input control.

## 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
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
InitialValue | initial_value | Optional. Specifies the starting value of the input control. Default value is null
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
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 "Please enter a number from 1 through 100", an input box to input a number, a RangeValidator control that checks that the input value is a number from 1 through 100, a RequiredFieldValidator control that checks that the input field isn't empty, 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
      lbl2.Text="You entered number " & txt1.text
    end if
    end sub
    </script>

    <Mobile:Form id="f1" runat="server">
      <Mobile:Label runat="server">
      Please enter a number from 1 through 100
      </Mobile:Label>

      <Mobile:TextBox id="txt1" runat="server"/>

      <Mobile:RangeValidator
      ControlToValidate="txt1"
      Type="Integer"
      MaximumValue="100"
      MinimumValue="1"
      Text="Invalid number"
      runat="server" />

      <Mobile:RequiredFieldValidator
      ControlToValidate="txt1"
      Text="A number is required"
      runat="server" />

      <Mobile:Command runat="server"
      OnClick="page2">Submit
      </Mobile:Command>
    </Mobile:Form>

    <Mobile:Form id="f2" runat="server">
      <Mobile:Label id="lbl2" runat="server" />
    </Mobile:Form>

Complete ASP.NET Mobile Reference

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