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Optimization is fun, but not easy... Not a single concept is always true. Combine this with multi-threading (think about the SMP machines and the newer hyperthreading processors) and optimization is almost a try and guess game, although some basic techniques do help a bit.
MtnBiknGuy wrote:
I would think #2 is preferrable, but I see that most C# examples use the
style of #1. In fact, I often see the following in C# examples:
#2 does one inutile assignment, #1 don't. But to solve this doubt, remove the "= null" (BTW, this isn't a good practice, as it defeats some useful compiler warnings) and just look and the generated code with ILDASM. I bet they generate exactly the same IL, as the maximum stack space is allocated on the method's entry.
MtnBiknGuy wrote:
Finally, I'm curious if there are any performance differences between the
following two loops.
If the JIT is as good as MS sells it, #1 could even be slightly faster than #2. MS says JIT does common subexpression elimination and code motion of loop invariants, which is exactly what you did, but sometimes the JIT could even do it without the need for another local variable (imagine that you have several loops).
Notice that the JIT sometimes will do a better job than you. If T.x is a virtual property, and not a field, you can't safely do what you showed (T.x could have a side effect, e.g. incrementing a counter to keep usage count). Although sometimes the JIT hasn't all the info or time it needs to make all the possible optimizations, it has all the info it needs to always act safely.
On a side note, you should make all of your timings on Release builds, because the optimizer is disabled on the Debug builds.
Kant wrote:
Actually she replied back to me "You shouldn't fix the bug. You should kill it"
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New Release
***********
XMLBooster has been released for C#. It includes numerous features
for more efficient integration of XML in C# applications.
By using native code generation rather than a generic approach,
XMLBooster guarantees top notch performance for demanding
transaction-based applications:
- 5 to 50 times faster than generic parsers
- Reduced memory footprint, can deal with even the largest inputs
- Improved schema support
- Support for mixed content and permutations
- Numerous options to tune the code generation process to your own needs
- Generates static parsers in C#, C, C++, Java, COBOL, Delphi, Ada
- Applications can be deployed royalty-free
- Licences start as low as $675
- Freely available XMLBooster Lite version
http://www.xmlbooster.com
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<a TITLE="See my user info" href=http:
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Parse this[^]! 
Kant wrote:
Actually she replied back to me "You shouldn't fix the bug. You should kill it"
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Daniel Turini wrote:
Parse this[^]!
Good one 
-Nick Parker
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I have a remote object which is returning an oledbDatareader from a method.
But the client application can’t read the data.
1. Is it possible to do this?
2. Is it possible to get an oledbConnection out from a remote object?
3. Any other way to do this?
Gaurika Wijeratne. // www.gaurika.com
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1. No, a reader should never be returned from any method.
2. No, same principle as above. If it aint yours, you cant have it.
3. Yes, datasets and webservices.
<a TITLE="See my user info" href=http:
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Hello,
It's me again......HELP
I am using the .NET IDE.
I am wanting to get a little information and insight about the best approach to accomplish something. I am wanting to integrate an MP3 recorder into an application. It needs to work simply. I want to pass a filename for the mp3 file, click the record button, when done click the stop button, then click the save button. No option to rename it. The program will handle the naming of the file. This will be used by a doctor and needs to be as simple as possible. The only user interface that will need to be implemented in the mp3 player/recorder should be only what a tape recorder is capable of. What is the best route to use? Are there some components in .NET that will enable any of this? Is there any API function call that can be used? A utility to integrate? The reason it needs to be MP3 is because of filesize. We will be dealing with up to 15 minute voice recordings. Any starting suggestions would be greatly appreciated.
Thanks,
Kendal
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You can embed the WindowsMedia player control into your application and customise it however you like...
Windows Media Player SDK[^]
HTH
Shaun 
-----------------------------------------------------------------------
Shaun Austin: .NET Specialist. Spreading the word of .NET to the world... well the UK... well my tiny corner of it!!
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The windows media player will not record MP3. Unless there is something I don't know, which is very possible
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I could be wrong but I'm sure I've seen something about the Media Player SDK having an Encoder API which allows you to use digital capture devices to create media files. It's not exactly my field of expertise so apologies if I have it all wrong.
Shaun
-----------------------------------------------------------------------
Shaun Austin: .NET Specialist. Spreading the word of .NET to the world... well the UK... well my tiny corner of it!!
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shaunAustin wrote:
I could be wrong but I'm sure I've seen something about the Media Player SDK having an Encoder API which allows you to use digital capture devices to create media files.
Take a look at the Windows Media[^] section of MS.
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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I'm pretty sure I have seen an article on CP about how to build these nifty toolbars that you can add to your Start Taskbar. You know the bar with the big green Start button on it? Well, if you right-click, you can add toolbars such as the Address, Links, Media Player, etc. Well I want to create such a toolbar.
I found this url[^] that closely looks like what I want to do, but I'm pretty sure I saw a different article about it.
Can anyone else dig it up?
Thanks.
R#
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Is this[^] the one
- Kannan
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:-DWhoow, finally got back to this (its a pet project)
And YES, YES, YES... thats the one;
again CPians deliver, I thanks you so very much. For some reason, I did not find it using the search, and I did look in that section, but probably I was already looking cross-eyed... this site just has too much good info.
thanks again,
R#
R# (well maybe not as # anymore as I used to be)
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Hi. I really need some help on this.
I need to serialize objets into one of the following formats
<myclass>
<member1>somevalue
<member2>option1
<member3>someothervalue
or
<myclass>
<member1>somevalue
<member2a>option2a
<member2b>option2b
<member3>someothervalue
I have been trying many things, yet I have not found something that works.
I really need some insights. If anyone knows how to do this, please tell me. I don't even know what is the best way of designing myClass so as to achieve this.
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Rocardo..
Do you think you could either replace your angle brackets with the code or re-post as plain text so that we can all see what it is you're trying to do...
Cheers
Shaun
-----------------------------------------------------------------------
Shaun Austin: .NET Specialist. Spreading the word of .NET to the world... well the UK... well my tiny corner of it!!
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Sorry. Here it goes again
Hi. I really need some help on this.
I need to serialize objets into one of the following formats (it may be one or the other for two different objects of type myClass)
<myClass>
<member1>somevalue</member1>
<member2>option1</member2>
<member3>someothervalue</member3>
</myClass>
or
<myClass>
<member1>somevalue</member1>
<member2a>option2a</member2a>
<member2b>option2b</member2b>
<member3>someothervalue</member3>
</myClass>
I have been trying many things, yet I have not found something that works.
I really need some insights. If anyone knows how to do this, please tell me. I don't even know what is the best way of designing myClass so as to achieve this.
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How can I add controls into the common dialog windows? (File open&save ones to be precise)
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Hello
I have written a C# application, and I want to launch it from a browser (Smart Client technology). (exe file)
BUT when I launch it, then I get all sort of security problems (Request for the permission of type System.Net.SocketPermission...). This is because I use a socket connection, and the Framework secury don't allow this as default.
Of cource I can let my users alter the security setup like in (http://www.csharp-station.com/ShowPost.aspx?PostID=304), but I would like to make a trusted exe file, so
that my users can choose to click "TRUST ALWAYS", and then the security setup is done automatic.
(like a webbank, activeX ect.)
Howto?
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I have a ListView in detail view with a check box. I want the check to indicate a status, but it needs to be read-only in the list view. In the in the ItemCheck event, I cancel any changes...
<br />
private void publishList_ItemCheck(object sender, System.Windows.Forms.ItemCheckEventArgs e)<br />
{<br />
e.NewValue = e.CurrentValue;<br />
}<br />
This works fine if the item is not selected. If I first select a line in the view, I can then un/check it. Docs say that the value of the Checked property doesn't change until after the ItemCheck finishes. Anybody know a way around this?
achavez
---
at us, very deafly a most stares
collosal hoax of clocks and calendars
ee cummings
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I have encountered a problem with string.Replace and String.Replace.
If I have:
string s = "Andrew Hartley";<br />
s.Replace( "Andrew", "A" );
s still holds "Andrew Hartley" and not "A Hartley" as I would expect!
This is the same for String.Replace also!!!
I have used Regex for the time being:
string s = "Andrew Hartley";<br />
Regex regex = new Regex( "Andrew" );<br />
s = regex.Replace( s, "A" );
s now holds the expected result of "A Hartley"
Does anyone have any comments to add, or any suggestions as to why string.Replace doesn't work?
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strings are immutable - so the replace function RETURNs a new string
so your code should be:
string s = "Andrew Hartley";<br />
s = s.Replace( "Andrew", "A" );
"When the only tool you have is a hammer, a sore thumb you will have."
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 In (server / client application )there is a webservice at the server side application, the clients access this webservice. the server can be located on any PC, so its IP
is dynamic. I do not have a fixed IP, for the server.
I have a problem in determining the IPAddress of the server everytime, in the web reference.
in other words, we want the address of the web reference to be dynamic, according to the current IP of the server.
Would anyone plz help me to do it !!!!
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Yep, I'll quote MSDN because it puts it better than I ever could
You can use the Web Reference URL property to specify the URL to the XML Web service. The Add Web Reference sets this property by default to the URL of the XML Web service you select, which is a static URL. A Web reference can use either a static URL or a dynamic URL.
If you leave the URL Behavior set to the default value of static, the proxy class sets the URL property using a hard-coded URL when you create an instance of the class.
If you set the URL Behavior property of the Web reference to dynamic, the application obtains the URL at run time from the <appsettings> Element of your application's configuration file. When you specify a dynamic URL after adding a Web reference, Visual Studio updates the proxy class to obtain the URL from the configuration file.
<br />
<br />
<appSettings><br />
<add key="myApplication.myServer.Service1" <br />
value="http://myServer/myXmlWebService/Service1.asmx"/><br />
</appSettings><br />
When you create an instance of a proxy object, you can also set the URL property of the object in your application.
Hope that's some help to ya!!!
Shaun
-----------------------------------------------------------------------
Shaun Austin: .NET Specialist. Spreading the word of .NET to the world... well the UK... well my tiny corner of it!!
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