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CompareValidator.ControlToCompare Property

Gets or sets the input control to compare with the input control being validated.

[Visual Basic]
Public Property ControlToCompare As String
[C#]
public string ControlToCompare {get; set;}
[C++]
public: __property String* get_ControlToCompare();
public: __property void set_ControlToCompare(String*);
[JScript]
public function get ControlToCompare() : String;
public function set ControlToCompare(String);

Property Value

The input control to compare with the input control being validated. The default value is String.Empty.

Remarks

Use the ControlToCompare property to specify an input control, such as a TextBox, to compare with the input control being validated. If the input control specified by this property is not a control on the page, an exception is thrown.

Note   Do not set both the ControlToCompare and ValueToCompare properties at the same time. You can either compare the value of an input control to another input control, or to a constant value. If both properties are set, the ControlToCompare property takes precedence.

For additional information, see BaseValidator.ControlToValidate.

Example

[Visual Basic, C#, JScript] The following example demonstrates how to use the ControlToCompare property to specify the control to compare with the control being validated.

[Visual Basic] 
<%@ Page Language="VB" AutoEventWireup="True" %>
 
<html>
<head>
   <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 runat=server>

      <h3>CompareValidator Example</h3>
      <p>
      Enter a value in each textbox. Select a comparison operator<br>
      and data type. Click "Validate" to compare values.
 
      <table bgcolor="#eeeeee" cellpadding=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 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"/>
               <p>
               <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 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-Name="verdana" 
           Font-Size="10pt" 
           runat="server"/>
 
   </form>
 
</body>
</html>


[C#] 
<%@ Page Language="C#" AutoEventWireup="True" %>
 
<html>
<head>
   <script runat="server">
 
      void Button_Click(Object sender, EventArgs e) 
      {
 
         if (Page.IsValid) 
         {
            lblOutput.Text = "Result: Valid!";
         }
         else 
         {
            lblOutput.Text = "Result: Not valid!";
         }

      }
 
      void Operator_Index_Changed(Object sender, EventArgs e) 
      {

         Compare1.Operator = (ValidationCompareOperator) ListOperator.SelectedIndex;
         Compare1.Validate();

      }

      void Type_Index_Changed(Object sender, EventArgs e) 
      {

         Compare1.Type = (ValidationDataType) ListType.SelectedIndex;
         Compare1.Validate();

      }
 
   </script>
 
</head>
<body>
 
   <form runat=server>

      <h3>CompareValidator Example</h3>
      <p>
      Enter a value in each textbox. Select a comparison operator<br>
      and data type. Click "Validate" to compare values.
 
      <table bgcolor="#eeeeee" cellpadding=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 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"/>
               <p>
               <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 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-Name="verdana" 
           Font-Size="10pt" 
           runat="server"/>
 
   </form>
 
</body>
</html>


[JScript] 
<%@ Page Language="JScript" AutoEventWireup="True" %>
 
<html>
<head>
   <script runat="server">
 
      function Button_Click(sender, e : EventArgs) 
      {
 
         if (Page.IsValid) 
         {
            lblOutput.Text = "Result: Valid!";
         }
         else 
         {
            lblOutput.Text = "Result: Not valid!";
         }

      }
 
      function Operator_Index_Changed(sender, e : EventArgs) 
      {

         Compare1.Operator = ValidationCompareOperator(ListOperator.SelectedIndex);
         Compare1.Validate();

      }

      function Type_Index_Changed(sender, e : EventArgs) 
      {

         Compare1.Type = ValidationDataType(ListType.SelectedIndex);
         Compare1.Validate();

      }
 
   </script>
 
</head>
<body>
 
   <form runat=server>

      <h3>CompareValidator Example</h3>
      <p>
      Enter a value in each textbox. Select a comparison operator<br>
      and data type. Click "Validate" to compare values.
 
      <table bgcolor="#eeeeee" cellpadding=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 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"/>
               <p>
               <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 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-Name="verdana" 
           Font-Size="10pt" 
           runat="server"/>
 
   </form>
 
</body>
</html>

[C++] No example is available for C++. To view a Visual Basic, C#, or JScript example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family

See Also

CompareValidator Class | CompareValidator Members | System.Web.UI.WebControls Namespace | BaseValidator.ControlToValidate | ValueToCompare | TextBox | IsValid | String.Empty

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