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RangeValidator Control

Evaluates the value of an input control to determine whether it is between a specified upper and lower boundary.

<asp:RangeValidator 
     id="ProgrammaticID" 
     ControlToValidate="ProgrammaticID of control to validate" 
     MinimumValue="value"
     MaximumValue="value" 
     Type="DataType" 
     ErrorMessage="Message to display in ValidationSummary control"
     Text="Message to display in control"
     ForeColor="value" 
     BackColor="value"  
     runat="server" >
</asp:RangeValidator>

Remarks

The RangeValidator control allows you to check whether a user's entry is between a specified upper and lower boundary. You can check ranges within pairs of numbers, alphabetic characters, and dates. Boundaries are expressed as constants.

Use the ControlToValidate property to specify the input control to validate. The MinimumValue and MaximumValue properties specify the minimum and maximum values of the valid range, respectively.

The Type property is used to specify the data type of the values to compare. The values to compare are converted to this data type before any comparison is performed.

Note   If the input control is empty, no validation functions are called and validation succeeds. Use a RequiredFieldValidator control to prevent the user from skipping an input control.
Note   The RangeValidator control throws an exception if the value specified by the MaximumValue or MinimumValue property cannot be converted to the data type specified by the Type property.

For detailed information on the RangeValidator control, see the RangeValidator class.

Example

The following example demonstrates how to use the RangeValidator control to validate whether the value entered in a text box is between one and ten. The validation result is then displayed on the page.

<%@ Page Language="VB" AutoEventWireup="True" %>

<html>

<head>

   <script runat="server">

      Sub ButtonClick(sender As Object, e As EventArgs)

         If Page.IsValid Then
        
            Label1.Text="Page is valid."
         
         Else
         
            Label1.Text="Page is not valid!!"
         
         End If

      End Sub

   </script>

</head>

<body>

   <form runat="server">

      <h3>RangeValidator Example</h3>

      Enter a number from 1 to 10:

      <br>

      <asp:TextBox id="TextBox1"
           runat="server"/>

      <br>

      <asp:RangeValidator id="Range1"
           ControlToValidate="TextBox1"
           MinimumValue="1"
           MaximumValue="10"
           Type="Integer"
           EnableClientScript="false"
           Text="The value must be from 1 to 10!"
           runat="server"/>

      <br><br>

      <asp:Label id="Label1"
           runat="server"/>

      <br><br>

      <asp:Button id="Button1"
           Text="Submit"
           OnClick="ButtonClick"
           runat="server"/>
            

   </form>

</body>
</html>
[C#]
<%@ Page Language="C#" AutoEventWireup="True" %>

<html>

<head>

   <script runat="server">

      void ButtonClick(Object sender, EventArgs e)
      {

         if (Page.IsValid)
         {
            Label1.Text="Page is valid.";
         }
         else
         {
            Label1.Text="Page is not valid!!";
         }

      }

   </script>

</head>

<body>

   <form runat="server">

      <h3>RangeValidator Example</h3>

      Enter a number from 1 to 10:

      <br>

      <asp:TextBox id="TextBox1"
           runat="server"/>

      <br>

      <asp:RangeValidator id="Range1"
           ControlToValidate="TextBox1"
           MinimumValue="1"
           MaximumValue="10"
           Type="Integer"
           EnableClientScript="false"
           Text="The value must be from 1 to 10!"
           runat="server"/>

      <br><br>

      <asp:Label id="Label1"
           runat="server"/>

      <br><br>

      <asp:Button id="Button1"
           Text="Submit"
           OnClick="ButtonClick"
           runat="server"/>
            

   </form>

</body>
</html>

See also

RangeValidator Class | Validation Server Controls

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