RequiredFieldValidator Class
Assembly: System.Web (in system.web.dll)
Use this control to make an input control a required field. The input control fails validation if its value does not change from the InitialValue property upon losing focus.
Multiple validators can be associated with the same input control. For example, a RequiredFieldValidator can be used to ensure input to a control, while at the same time a RangeValidator can be used to ensure that the input is within a specified data range.
For additional information on validation controls, see BaseValidator.
Accessibility
The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.
The following example demonstrates how to use the RequiredFieldValidator control to make sure that the user enters a value into 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 Studio). |
<html>
<head>
<script language="C#" runat=server>
void ValidateBtn_Click(Object sender, EventArgs e) {
if (Page.IsValid == true) {
lblOutput.Text = "Required field is filled!";
}
else {
lblOutput.Text = "Required field is empty!";
}
}
</script>
</head>
<body>
<h3><font face="Verdana">RequiredField Validator Sample</font></h3>
<p>
<form runat="server">
<table bgcolor="#eeeeee" cellpadding=10>
<tr valign="top">
<td colspan=3>
<asp:Label ID="lblOutput"
Text="Fill in the required field below"
ForeColor="red"
Font-Name="Verdana"
Font-Size="10" runat=server /><br>
</td>
</tr>
<tr>
<td colspan=3>
<font face=Verdana size=2><b>Credit Card Information</b></font>
</td>
</tr>
<tr>
<td align=right>
<font face=Verdana size=2>Card Number:</font>
</td>
<td>
<asp:TextBox id=TextBox1 runat=server />
</td>
<td>
<asp:RequiredFieldValidator id="RequiredFieldValidator2"
ControlToValidate="TextBox1"
Display="Static"
Width="100%" runat=server>
*
</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td></td>
<td>
<asp:Button id=Button1
text="Validate"
OnClick="ValidateBtn_Click"
runat=server />
</td>
<td></td>
</tr>
</table>
</form>
</body>
</html>
System.Web.UI.Control
System.Web.UI.WebControls.WebControl
System.Web.UI.WebControls.Label
System.Web.UI.WebControls.BaseValidator
System.Web.UI.WebControls.RequiredFieldValidator
Security Note: