RangeValidator Control

Definition and Usage

The RangeValidator control is used to check that the user enters an input  value that falls between two values. It is possible to check ranges within numbers, dates, and characters.

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

Properties

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>

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