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BaseValidator.Validate Method

Performs validation on the associated input control and updates the IsValid property.

[Visual Basic]
Public Overridable Sub Validate() Implements IValidator.Validate
[C#]
public virtual void Validate();
[C++]
public: virtual void Validate();
[JScript]
public function Validate();

Implements

IValidator.Validate

Remarks

Use the Validate method to perform validation on the associated input control. This method allows you to programmatically perform validation on the input control. The IsValid property is automatically updated with the validation results.

Example

[Visual Basic, C#, JScript] The following example demonstrates how to use the Validate method to perform validation when the Submit button is clicked.

[Visual Basic] 
<%@ Page Language="VB" AutoEventWireup="True" %>

<html>
<head>
   <script runat="server">
 
      Sub Button_Click(sender As Object, e As EventArgs) 

         Dim rand_number As Random = New Random()

         Compare1.ValueToCompare = rand_number.Next(1, 10).ToString()
         Compare1.Validate()
 
         If Page.IsValid Then 

            lblOutput.Text = "You guessed correctly!!"
         
         Else 
         
            lblOutput.Text = "You guessed poorly"
         
         End If

         lblOutput.Text += "<br><br>" & "The number is: " & Compare1.ValueToCompare

      End Sub
 
   </script>
 
</head>
<body>
 
   <form runat=server>

      <h3>Validator Example</h3>

      <h5>Pick a number between 1 and 10:</h5>
     
      <asp:TextBox id="TextBox1" 
           runat="server"/>

      <asp:CompareValidator id="Compare1" 
           ControlToValidate="TextBox1"
           ValueToCompare="0"
           EnableClientScript="False"  
           Type="Integer"
           Display="Dynamic" 
           ErrorMessage="Incorrect guess!!"
           Text="*"
           runat="server"/>

      <asp:RequiredFieldValidator id="Require1" 
           ControlToValidate="TextBox1"
           EnableClientScript="False"
           Display="Dynamic" 
           ErrorMessage="No number entered!!"
           Text="*"
           runat="server"/>

      <br><br>

      <asp:Button id="Button1"
           Text="Submit"
           OnClick="Button_Click"
           runat="server"/>
 
      <br><br>
       
      <asp:Label id="lblOutput" 
           Font-Name="verdana" 
           Font-Size="10pt" 
           runat="server"/>

      <br><br>

      <asp:ValidationSummary
           id="Summary1"
           runat="server"/>
 
   </form>
 
</body>
</html>


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

<html>
<head>
   <script runat="server">
 
      void Button_Click(Object sender, EventArgs e) 
      {

         Random rand_number = new Random();

         Compare1.ValueToCompare = rand_number.Next(1, 10).ToString();
         Compare1.Validate();
 
         if (Page.IsValid) 
         {
            lblOutput.Text = "You guessed correctly!!";
         }
         else 
         {
            lblOutput.Text = "You guessed poorly";
         }

         lblOutput.Text += "<br><br>" + "The number is: " + Compare1.ValueToCompare;

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

      <h3>Validator Example</h3>

      <h5>Pick a number between 1 and 10:</h5>
     
      <asp:TextBox id="TextBox1" 
           runat="server"/>

      <asp:CompareValidator id="Compare1" 
           ControlToValidate="TextBox1"
           ValueToCompare="0"
           EnableClientScript="False"  
           Type="Integer"
           Display="Dynamic" 
           ErrorMessage="Incorrect guess!!"
           Text="*"
           runat="server"/>

      <asp:RequiredFieldValidator id="Require1" 
           ControlToValidate="TextBox1"
           EnableClientScript="False"
           Display="Dynamic" 
           ErrorMessage="No number entered!!"
           Text="*"
           runat="server"/>

      <br><br>

      <asp:Button id="Button1"
           Text="Submit"
           OnClick="Button_Click"
           runat="server"/>
 
      <br><br>
       
      <asp:Label id="lblOutput" 
           Font-Name="verdana" 
           Font-Size="10pt" 
           runat="server"/>

      <br><br>

      <asp:ValidationSummary
           id="Summary1"
           runat="server"/>
 
   </form>
 
</body>
</html>


[JScript] 
<%@ Page Language="JScript" AutoEventWireup="True" %>

<html>
<head>
   <script language="JScript" runat="server">
 
      function Button_Click(sender, e : EventArgs) 
      {

         var rand_number : Random  = new Random();

         Compare1.ValueToCompare = rand_number.Next(1, 10).ToString();
         Compare1.Validate();
 
         if (Page.IsValid) 
         {
            lblOutput.Text = "You guessed correctly!!";
         }
         else 
         {
            lblOutput.Text = "You guessed poorly";
         }

         lblOutput.Text += "<br><br>" + "The number is: " + Compare1.ValueToCompare;

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

      <h3>Validator Example</h3>

      <h5>Pick a number between 1 and 10:</h5>

      <asp:RequiredFieldValidator id="Require1" 
           ControlToValidate="TextBox1"
           Type="Integer" 
           ErrorMessage="No number entered!!"
           Text="*"
           runat="server"/>
     
      <asp:TextBox id="TextBox1" 
           runat="server"/>

      <asp:CompareValidator id="Compare1" 
           ControlToValidate="TextBox1"
           ValueToCompare="0"
           EnableClientScript="False"  
           Type="Integer" 
           ErrorMessage="Incorrect guess!!"
           Text="*"
           runat="server"/>

      <br><br>

      <asp:Button id="Button1"
           Text="Submit"
           OnClick="Button_Click"
           runat="server"/>
 
      <br><br>
       
      <asp:Label id="lblOutput" 
           Font-Name="verdana" 
           Font-Size="10pt" 
           runat="server"/>

      <br><br>

      <asp:ValidationSummary
           id="Summary1"
           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

BaseValidator Class | BaseValidator Members | System.Web.UI.WebControls Namespace | IsValid

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