ASP.NET PDF Viewer using C#, VB/NET

type HANDLE = nativeint type ADDR = nativeint [<DllImport("kernel32", SetLastError=true)>] extern bool CloseHandle(HANDLE handler) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE CreateFile(string lpFileName, int dwDesiredAccess, int dwShareMode, HANDLE lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, HANDLE hTemplateFile) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE CreateFileMapping(HANDLE hFile, HANDLE lpAttributes, int flProtect, int dwMaximumSizeLow, int dwMaximumSizeHigh, string lpName) [<DllImport("kernel32", SetLastError=true)>] extern ADDR MapViewOfFile(HANDLE hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow, int dwNumBytesToMap) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE OpenFileMapping(int dwDesiredAccess, bool bInheritHandle, string lpName) [<DllImport("kernel32", SetLastError=true)>] extern bool UnmapViewOfFile(ADDR lpBaseAddress) let INVALID_HANDLE = new IntPtr(-1) let MAP_READ = 0x0004 let GENERIC_READ = 0x80000000

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runstats is a simple test harness that allows comparison of two executions of code and displays the costs of each in terms of the elapsed time, session-level statistics (such as parse calls), and latching differences. The latter of these, latching, is the key piece of information that this tool provides.

ViewState is nothing more than a simple state bag, or collection of tuples So the DropDownList has an entry in ViewState for its ListItemCollection value, and that value is a collection of tuples, one for each ListItem in the collection Each of those values, in turn, is a triplet, containing the name, value, and whether or not the field is visible This organization scheme results in a hierarchical tree of tuple collections, where each control gets its own node of the tree to squirrel away its own values When the state of the control tree is being saved, each control in the page s control tree has its SaveViewState method called This is a virtual method of the Control class, and so any control developer can write an override for it.

NULL_HANDLE = IntPtr.Zero FILE_SHARE_NONE = 0x0000 FILE_SHARE_READ = 0x0001 FILE_SHARE_WRITE = 0x0002 FILE_SHARE_READ_WRITE = 0x0003 CREATE_ALWAYS = 0x0002 OPEN_EXISTING = 0x0003 OPEN_ALWAYS = 0x0004 READONLY = 0x00000002

Note The runstats tool was originally built by Tom Kyte, the man behind the http://asktom.oracle.com

Understand that the Microsoft engineer who wrote the code for the DropDownList did so exactly the same way someone creating a custom Web Control for her own application would, by interacting with the property bag interface You can see the impact the DropDownList has on the resulting HTML in a couple of different ways First, there s the trace output report that shows you a control-by-control report of the size each control adds to ViewState (see Figure 4-1)..

website. You can find full information and an example usage of runstats at http://asktom.oracle.com/ ~tkyte/runstats.html.

type MemMap<'a> (fileName) = let ok = match (type 'a) with | ty when ty = (type | ty when ty = (type | ty when ty = (type | ty when ty = (type | ty when ty = (type | ty when ty = (type | ty when ty = (type | ty when ty = (type | _ -> false

Note Latches are lightweight serialization resources Oracle uses when accessing shared memory structures. See the section titled Locks and Latches in 2 of this book for more details. You can also read more about latches in Oracle Database Concepts Guide (10g Release 1).

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Figure 4-1. ViewState on the trace output report This provides a good breakdown of the relative sizes, but unfortunately there s no total for the ViewState value. The easiest way to measure this is to use the built-in functionality of your web browser. While viewing any ASP .NET page from the browser, choose View Source. From the instance of Notepad displaying the markup, choose File Save As and write the file out anywhere on your file system (i.e., c:\tmp.htm). Now add EnableViewState=false to the page directive: <%@ Page language="c#" CodeFile="ViewStateIE.aspx.cs" Inherits="APressWebWork.ViewStateIE" EnableViewState=false %> Go back to the browser, refresh the page, view the source again, and write the markup out to another file. The difference in the sizes of these files lets you know the total size of ViewState for the page. Let s look a little more closely at exactly what s stored in ViewState. You ll start by adding a textbox control to a Web Form, and setting its EnableViewState property to false. You ll also add some simple code to the Load event trap, to show whether the request is a postback or a first request. <%@ Page Language="C#" CompileWith="ViewStateIE.aspx.cs" ClassName="ViewStateIE_aspx" Trace="true" %> <html> <head runat="server"> <title>ViewStateIE</title> </head> <body> <form id="form1" runat="server">