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HttpException Class

Describes an exception that occurred during the processing of HTTP requests.

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

[SerializableAttribute]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class HttpException : ExternalException

The HttpException class is an HTTP-specific exception class that enables ASP.NET to generate exception information. For more information about throwing and handling exceptions, see Handling and Throwing Exceptions.

The following code example demonstrates how to use the HttpException class to raise customized exceptions. The Button_Click method determines which button was clicked, and then calls either the CheckNumber or CheckBoolean method. If the user-entered value in the text box does not correspond to the expected type, an HttpException exception is created and thrown with a customized message based on the error type.

Security noteSecurity 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.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    void CheckNumber()
    {
        try
        {
            // Check whether the value is an integer.
            String convertInt = textbox1.Text;
            Convert.ToInt32(convertInt);
        }
        catch (Exception e)
        {
            // Throw an HttpException with customized message. 
            throw new HttpException("not an integer");
        }
    }
    void CheckBoolean()
    {
        try
        {
            // Check whether the value is an boolean.
            String convertBool = textbox1.Text;
            Convert.ToBoolean(convertBool);
        }
        catch (Exception e)
        {
            // Throw an HttpException with customized message. 
            throw new HttpException("not a boolean");
        }
    }

    void Button_Click(Object sender, EventArgs e)
    {
        try
        {
            // Check to see which button was clicked.
            Button b = (Button)sender;
            if (b.ID.StartsWith("button1"))
                CheckNumber();
            else if (b.ID.StartsWith("button2"))
                CheckBoolean();

            label1.Text = "You entered: " + textbox1.Text;
            label1.ForeColor = System.Drawing.Color.Black;
        }
        // Catch the HttpException. 
        catch (HttpException exp)
        {
            label1.Text = "An HttpException was raised. "
               + "The value entered in the textbox is " + exp.Message.ToString();
            label1.ForeColor = System.Drawing.Color.Red;
        }
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>HttpException Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <br />
        <b>Enter a value in the text box.</b>
        <br />
        <asp:TextBox ID="textbox1" 
                     Runat="server">
        </asp:TextBox>
        <br />
        <asp:Button ID="button1"
                    Text="Check for integer."  
                    OnClick="Button_Click" 
                    Runat="server">
        </asp:Button>
        <br />
        <asp:Button ID="button2"
                    Text="Check for boolean." 
                    OnClick="Button_Click" 
                    Runat="server">
        </asp:Button>
        <br />
        <asp:Label ID="label1" 
                   Runat="server">
        </asp:Label>    
    </div>
    </form>
</body>
</html>

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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.

.NET Framework

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

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