ASP.NET Number Validation Using RegularExpressionValidator Controls

ASP.NET RegularExpressionValidator is used to check input value is number or not. The RegularExpressionValidator control belongs to System.Web.UI.WebControls

Syntax

<code><asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server"   
ControlToValidate="TextBox4" ErrorMessage="Enter only 0-9 numbers."   
ValidationExpression="^[0-9]*$"></asp:RegularExpressionValidator>
</code>

ASP.NET RegularExpressionValidator Control Property

Property	Description
ControlToValidate	Specifies control name which needs to be validate.
Display	Specifies behavior of the error message.
EnableClientScript	Specifies whether or not client-side validation is enabled.
Enabled	Specifies whether or not validation control is enabled or not.
ErrorMessage	Specifies error messageto be display in validation summary.
ForeColor	Specifies error message color.
IsValid	Indicate if associate control passes validation or not.
SetFocusOnError	Set focus on associate control if validation fails.
Text	Specifies text to be display if validation fails.
ValidationGroup	Specifies validation group name.
Validate	Update the isvalid propery.
ValidateGetValidationProperty	Determineing validation property of a control, if it exists.

ValidationExpression	Specifies regular expression that you want to match against input value.

ASP.NET Number Validation Using RegularExpressionValidator Controls Example

<code><%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" 
Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="https://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ASP.NET Number validation using RegularExpressionValidator Example</title>
</head>
<body>
<form id="Form" runat="server">  
<div style="width: 619px">  
<asp:Label ID="lblTitle" runat="server" Font-Bold="True" Font-Size="Medium"   
Font-Underline="True" Text="ASP.NET Numeric Validation Example"></asp:Label>  
<br /><br />
<table border="0" width="600px" cellpadding="0" cellspacing="0">  
<tr><td>  
<asp:Label ID="lblZip" runat="server" Font-Bold="True" Font-Size="Small"   
Text="Enter Number:"></asp:Label>  
<asp:TextBox ID="TextBox4" runat="server" Width="177px"></asp:TextBox>  
<asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server"   
ControlToValidate="TextBox4" ErrorMessage="Enter only 0-9 numbers."   
ValidationExpression="^[0-9]*$"></asp:RegularExpressionValidator>  
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"   
ControlToValidate="TextBox4" ErrorMessage="This is required field, 
can not be blank."></asp:RequiredFieldValidator>  
</td></tr>  
<tr><td>  
<asp:Button ID="btnSubmit" runat="server" Font-Bold="True"   
Font-Size="Small" Text="Submit" Width="60px" />  
</td></tr>  
</table>     
</div>   
</form>  
</body>
</html>
</code>

Above example will produce following output

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ASP.NET Validation Controls 37

RequiredFieldValidator

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RegularExpressionValidator

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CustomValidator

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ValidationSummary

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