Page 118 - DCAP312_WEB_TECHNOLOGIES_II

Web Technologies-II

Notes if (ddlquotes.SelectedIndex != -1)
{
lblquotes.Text = String.Format( “{0}, Quote: {1}”,
ddlquotes.SelectedItem.Text, ddlquotes.SelectedValue);
}
}
}
Tracing
To enable page level tracing, you need to modify the Page directive and add a Trace attribute as:
<%@ Page Language= “C#” AutoEventWireup= “true”
CodeBehind= “Default.aspx.cs”
Inherits= “errorhandling._Default”
Trace = “true” %>Now when you run the file, you get the tracing information:

It provides the following information at the top:
• Session ID
• Status Code

• Time of Request
• Type of Request
• Request and Response Encoding
The status code sent from the server, each time the page is requested shows the name and time
of error if any. The following table shows the common HTTP status codes:(See Table 6.1)

Table 6.1: Common HTTP Status Codes
Number Description
Informational (100 - 199)
100 Continue
101 Switching protocols
Successful (200 - 299)
200 OK
204 No content
Redirection (300 - 399)
301 Moved permanently
305 Use proxy
307 Temporary redirect
Client Errors (400 - 499)
400 Bad request
402 Payment required
404 Not found
408 Request timeout
417 Expectation failed
Server Errors (500 - 599)
500 Internal server error
503 Service unavailable
505 HTTP version not supported

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