ValidationCompareOperator Enumeration

 

Specifies the validation comparison operators used by the CompareValidator control.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

Public Enumeration ValidationCompareOperator

Member nameDescription
DataTypeCheck

A comparison for data type only.

Equal

A comparison for equality.

GreaterThan

A comparison for greater than.

GreaterThanEqual

A comparison for greater than or equal to.

LessThan

A comparison for less than.

LessThanEqual

A comparison for less than or equal to.

NotEqual

A comparison for inequality.

The ValidationCompareOperator enumeration represents the comparison operations that can be performed by the CompareValidator control.

System_CAPS_noteNote

Unlike the other operators, DataTypeCheck is a unary operation. Only the data type of the input control being validated is checked. If the ControlToCompare or ValueToCompare properties are set when this operation is used, those values are not checked.

System_CAPS_security Security Note

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>CompareValidator Example</title>
<script runat="server">

      Sub Button_Click(sender As Object, e As EventArgs) 

         If Page.IsValid Then 

            lblOutput.Text = "Result: Valid!"

         Else 

            lblOutput.Text = "Result: Not valid!"

         End If

      End Sub

      Sub Operator_Index_Changed(sender As Object, e As EventArgs) 

         Compare1.Operator = CType(ListOperator.SelectedIndex, ValidationCompareOperator)
         Compare1.Validate()

      End Sub

      Sub Type_Index_Changed(sender As Object, e As EventArgs) 

         Compare1.Type = CType(ListType.SelectedIndex, ValidationDataType)
         Compare1.Validate()

      End Sub

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3>CompareValidator Example</h3>
      <br />
      Enter a value in each textbox. Select a comparison operator<br />
      and data type. Click "Validate" to compare values.

      <table style="background-color:#eeeeee; padding:10">

         <tr valign="top">

            <td>

               <h5>String 1:</h5>
               <asp:TextBox id="TextBox1" 
                    runat="server"/>

            </td>

            <td>

               <h5>Comparison Operator:</h5>

               <asp:ListBox id="ListOperator" 
                    OnSelectedIndexChanged="Operator_Index_Changed" 
                    runat="server">

                  <asp:ListItem Selected="True" Value="Equal">Equal</asp:ListItem>
                  <asp:ListItem Value="NotEqual">NotEqual</asp:ListItem>
                  <asp:ListItem Value="GreaterThan">GreaterThan</asp:ListItem>
                  <asp:ListItem Value="GreaterThanEqual">GreaterThanEqual</asp:ListItem>
                  <asp:ListItem Value="LessThan">LessThan</asp:ListItem>
                  <asp:ListItem Value="LessThanEqual">LessThanEqual</asp:ListItem>
                  <asp:ListItem Value="DataTypeCheck">DataTypeCheck</asp:ListItem>

               </asp:ListBox>

            </td>

            <td>

               <h5>String 2:</h5>
               <asp:TextBox id="TextBox2" 
                    runat="server"/>
               <br />
               <asp:Button id="Button1"
                    Text="Validate"  
                    OnClick="Button_Click" 
                    runat="server"/>

            </td>
         </tr>

         <tr>
            <td colspan="3" align="center">

               <h5>Data Type:</h5>

               <asp:ListBox id="ListType" 
                    OnSelectedIndexChanged="Type_Index_Changed" 
                    runat="server">

                  <asp:ListItem Selected="true" Value="String" >String</asp:ListItem>
                  <asp:ListItem Value="Integer" >Integer</asp:ListItem>
                  <asp:ListItem Value="Double" >Double</asp:ListItem>
                  <asp:ListItem Value="Date" >Date</asp:ListItem>
                  <asp:ListItem Value="Currency" >Currency</asp:ListItem>

               </asp:ListBox>
            </td>
         </tr>
      </table>

      <asp:CompareValidator id="Compare1" 
           ControlToValidate="TextBox1" 
           ControlToCompare="TextBox2"
           EnableClientScript="False" 
           Type="String" 
           runat="server"/>

      <br />

      <asp:Label id="lblOutput" 
           Font-Names="verdana" 
           Font-Size="10pt" 
           runat="server"/>

   </form>

</body>
</html>

.NET Framework
Available since 1.1
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