RequiredFieldValidator.InitialValue Property (System.Web.UI.WebControls)

InitialValue Property

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

RequiredFieldValidator..::.InitialValue Property

Gets or sets the initial value of the associated input control.

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

Syntax

Visual Basic (Declaration)

<ThemeableAttribute(False)> _
Public Property InitialValue As String

Visual Basic (Usage)

Dim instance As RequiredFieldValidator
Dim value As String

value = instance.InitialValue

instance.InitialValue = value

[ThemeableAttribute(false)]
public string InitialValue { get; set; }

Visual C++

[ThemeableAttribute(false)]
public:
property String^ InitialValue {
    String^ get ();
    void set (String^ value);
}

JScript

public function get InitialValue () : String
public function set InitialValue (value : String)

ASP.NET

<asp:RequiredFieldValidator InitialValue="String" />

Property Value

Type: System..::.String
A string that specifies the initial value of the associated input control. The default is String..::.Empty.

Remarks

Use this property to specify the initial value of the input control.

Validation fails only if the value of the associated input control matches this InitialValue upon losing focus.

Note:
The strings in both the InitialValue property and the input control are trimmed to remove extra spaces before and after the string before validation is performed.

This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and ASP.NET Themes and Skins Overview.

Examples

The following example demonstrates how to use the InitialValue property to ensure that the user enters a value in the text box.

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.

Visual Basic

<%@ 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  >
<head runat="server">
    <title>RequiredFieldValidator InitialValue Example</title>
</head>
<body>

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

      <h3>RequiredFieldValidator InitialValue Example</h3>

      Name: 
      <asp:TextBox id="Text1" 
           Text="Enter a value" 
           runat="server"/>

      <asp:RequiredFieldValidator id="RequiredFieldValidator1" 
           InitialValue="Enter a value" 
           ControlToValidate="Text1"
           ErrorMessage="Required field!"
           runat="server"/>

      <br />

      <asp:Button id="Button1"
           Text="Validate" 
           runat="server"/>

   </form>

</body>
</html>

<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html  >
<head runat="server">
    <title>RequiredFieldValidator InitialValue Example</title>
</head>
<body>

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

      <h3>RequiredFieldValidator InitialValue Example</h3>

      Name: 
      <asp:TextBox id="Text1" 
           Text="Enter a value" 
           runat="server"/>

      <asp:RequiredFieldValidator id="RequiredFieldValidator1" 
           InitialValue="Enter a value" 
           ControlToValidate="Text1"
           ErrorMessage="Required field!"
           runat="server"/>

      <br />

      <asp:Button id="Button1"
           Text="Validate" 
           runat="server"/>

   </form>

</body>
</html>

The following example demonstrates how to use the InitialValue property to ensure that the user selects an item from the list box.

Visual Basic

<%@ 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  >
<head runat="server">
    <title>RequiredFieldValidator InitialValue Example</title>
</head>
<body>

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

      <h3>RequiredFieldValidator InitialValue Example</h3>

      <asp:ListBox id="list"
           runat="server">

         <asp:ListItem Value="Australia">Australia</asp:ListItem>
         <asp:ListItem Selected="True" Value="NoCountry">--ChooseCountry--</asp:ListItem>
         <asp:ListItem Value="USA">USA</asp:ListItem>

      </asp:ListBox>

      <asp:RequiredFieldValidator id="valList"
           ForeColor="#FF0000"
           ErrorMessage="Selection Invalid!"
           ControlToValidate="list"
           InitialValue="NoCountry"
           EnableClientScript="False"
           runat="server"/>

      <br />

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

   </form>

</body>
</html>

<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html  >
<head runat="server">
    <title>RequiredFieldValidator InitialValue Example</title>
</head>
<body>

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

      <h3>RequiredFieldValidator InitialValue Example</h3>

      <asp:ListBox id="list"
           runat="server">

         <asp:ListItem Value="Australia">Australia</asp:ListItem>
         <asp:ListItem Selected="True" Value="NoCountry">--ChooseCountry--</asp:ListItem>
         <asp:ListItem Value="USA">USA</asp:ListItem>

      </asp:ListBox>

      <asp:RequiredFieldValidator id="valList"
           ForeColor="#FF0000"
           ErrorMessage="Selection Invalid!"
           ControlToValidate="list"
           InitialValue="NoCountry"
           EnableClientScript="False"
           runat="server"/>

      <br />

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

   </form>

</body>
</html>

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Reference

RequiredFieldValidator Class

RequiredFieldValidator Members

System.Web.UI.WebControls Namespace