C# 5.0 Programmer's Reference

Code File Structure ❘ 37
{
...
}
#pragma warning restore 1591
}
...
The class begins with an XML comment, so it doesn’t cause a warning. The PrintTimesheet
method does not have an XML comment, so it would cause a warning if the #pragma warning
disable directive didn’t disable the error.
After the PrintTimesheet method ends, the code restores the warning, so the compiler can report it
for the class’s later public members.
The #pragma checksum directive has the following format.
#pragma checksum "file" "{guid}" "bytes"
This directive is useful for debugging ASP.NET applications. It’s outside the scope of this book, so
it isn’t described here. For more information, see msdn.microsoft.com/library/ms173226.aspx.
Finding Warning Numbers
Unfortunately, the Error List doesn’t display the warning numbers you need to
use with the #pragma warning directive. One way to find a warning number is to
right-click the warning in the Error List and select Show Error Help. That opens a
web page that describes the warning and gives the warning number.
You can find a summary of compiler errors and warnings at msdn.microsoft
.com/library/vstudio/ms228296.aspx, although the warnings are listed by
number and not name, so that won’t help you find the number you want.
Code File Structure
The following code shows the file Form1.cs from a newly created program named
WindowsFormsApplication1. This is a Windows Forms program created in Visual Studio
Express 2012 for Windows Desktop.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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