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I'm having a wierd issue where i run a query in a thread and the while(Connection.read()) duplicates my results. Anyone else have this issue? For isntance if I have TestTable with the following values:
TestID
1
2
3
It will console.writeline
1
1
2
2
3
3
Below is sample code:
private void button3_Click(object sender, System.EventArgs e)
{
ThreadStart DBThread = new ThreadStart(StartDBDelegate) ;
Thread DB = new Thread(DBThread) ;
DB.Start();
}
public void StartDBDelegate)()
{
Invoke(new UpdateLoadTableDelegate(RunUpdateNow));
}
public void RunUpdateNow()
{
string source =
"server=testserver;uid=testuid;pwd=testpassword;database=TestDB";
string selectconn1 = "SELECT TestID as dbTestID FROM TestTable"
SqlConnection conn1 = new SqlConnection(source);
conn1.Open();
SqlCommand executeconn1 = new SqlCommand(selectconn1,conn1);
SqlDataReader Connection1 = executeconn1.ExecuteReader();
while(Connection1.Read())
{
Console.WriteLine (Connection1[0].ToString())
}
}
I can reduce this menace by doing the following to the while loop, although I shouldnt have to do this...this is really bugging me. It doesnt do this outside of the thread.
string strTestID = "";
while(Connection1.Read())
{
if(strTestID != Connection1[0].ToString()))
{
Console.WriteLine (Connection1[0].ToString())
strTestID = Connection1[0].ToString());
}
}
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I am currently trying to learn C# and looking at some of the classes available, I have come across a snag. I'm looking at the TimeZone class in the System namespace. It has a static function CurrentTimeZone which is fine, but what if i want to work with a different TimeZone? How do I specify that I wish to work in US Mountain Standard Time or AUS Eastern Standard Time ?
Thanx in advance.
The jubjub
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Through the system clock. This isn't really meant to be changed, but is to help with UTC conversions. The date/time related stuff you should be looking at is the DateTime and TimeSpan structures. Using different combinations of methods and properties between all the date/time-related classes allows you to get offsets, manipulate dates and times, and much more. There's a lot available.
As far as working in different dates and times (like for applications), it must either be set by the operating system or emulated through assuming a different offset (like to display a world clock or something). Just remember to work with UTC and not local dates and times, because some time zones don't recognize daylight savings time (I want to move there!). The TimeZone class is there to help you figure all that stuff out without coding most of it yourself.
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Thanx Heath, I was hoping there was something I was missing, like some fancy function or hidden class that would make my life easier so I wouldn't have to do too many calculations. But, to the calculations I go.
I did these sorts of calcs in C++ a while back, by getting the timezone info from the registry, and i was thinking maybe MS has made my life a little easier with .Net.
Thanx for your help buddy.
Jubjub
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Sometimes it's a question of whether it should be allowed. Such time zone assumptions could lead to problems.
Also, here's a good / important tip: much of the stuff in .NET (especially for Windows Forms) is actually their Win32 counterparts wrapped in .NET classes. System.Windows.Forms for example, redefines a LOT of structures and constants found in various headers (especially for common controls) and P/Invokes a lot of methods (countless variations of SendMessage, for example).
So, while classes in a truly object-oriented framework might make things easier by the sheer nature of OO, the functionality isn't a whole lot different (just easier to do: ex. write a C++ COM component and .NET component exposing a CCW and see which one takes less coding and is less prone to coding errors!).
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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This is my first .net web application. I am using asp.net and C#. I have a db lookup that I want a progress bar or cursor change to show the end user the program is loading. I have found many things for the "Web.Form" side but none for the "Web.UI" side. Any suggestions or links?
Thanks,
John
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Actually, this really isn't the place to post this. You'll want the Web Development forum. But anyway...
ASP.NET is server-side technology. In order to display a progress bar, this is all done through client-side scripting. To display a different cursor, see the cursor attribute of CSS. It allows you to set a predefined cursor (like the wait cursor) or to use a custom one (through a url('/path/to/my/cursor.cur') value).
As far as a progress bar, this is either very easy or very hard. To just display some eye candy, you can easily use javascript to resize an image by a certain amount based on a timer. If that amount is to mean anything real, you have to ask the server for status. Perhaps this can be acheived through some nifty use of HTTP Keep-Alive, but I've never seen it. Only other ways are to use ActiveX (IE-specific, Java Applets, or embedded .NET user controls (IE 5.01+ specific) to either display the progress bar or poll the status on the server based on the current user's context and update the resizing image ("progress bar").
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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Alright,
My first born child to anyone who can sort me out. I have an ArrayList filled with objects called remotes. Remote is a struct, and in remote I wrote the CompareTo method to allow a binary search on the arraylist. This CompareTo method compares the remoteIDs, which is a field that I fill in as I populate the arraylist. The remoteID is from a database, it is unique, but not necessarily consecutive. So I may have three remotes in my arraylist of 30, 50, and 80. When I do a binary seach based on an object I populate, say I create a new remote, set its remoteID to 30, and do a binary seach on the arraylist, it works if the remoteID is close to the bounds of the array. So if the array length is 82, and my remote ID is 50, it finds the object and returns the index correctly. When I start getting nearer to the bounds of the array, say remote id equals 81, or even 85, being greater than the bounds of the array, it returns a negative number being one greater than the count of the array. So in this case a -83. Is it using the bounds of the array as min and max numbers, and therefore the algorithim bombs out do to the fact that my RemoteID numbers are outside those bounds? What can I do to resolve this issue? Any help offered would be greatly appreciated.
Thanks,
Ryan
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I'm not quite sure I follow you right (I hate "run-on" paragraphs  ) so let me ask a couple things. So, you implemented IComparable for sorting, right? This problem occurs when sorting? How about posting the source somewhere (if not long, just post it here)?
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Version: 3.21
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No, I implemented IComparible for the binary search function. The code is pretty involved, so if i posted it, i think it would make things difficult.
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AFAIK you will need to call sort everytime u insert a new element. BinarySearch only works on sorted data.
leppie::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.
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Echoing leppie, the only way you can perform a binary search is if the elements are ordered. Otherwise, there's no way to partition the search space.
Binary search algo:
1. initial searchpos = midpoint of array
2. testvalue = value(searchpos)
3. if( testvalue > searchvalue )
searchpos = midpoint( beginningofarray, searchpos )
elseif( testvalue < searchvalue )
searchpos = midpoint( searchpos, endofarray)
else
you found your value
4. goto 2
[EDIT]Yeah, I'm aware of the glaring bugs in the above pseudocode...see below for explanation [/EDIT]
Not sure if this answers anything...I'm too burnt out to tell 
Jeremy Kimball
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Helo,
I'm developing a web page which need an ActiveX control,
I add the ActiveX control to the webform, and then I go to
the properties of the new object and put ID = Objeto1,
then I try to write in the webform Objeto1. nothing apear,
but i wrhite Objeto1.Method(); and when i try to compile
send me an error.
How I can add property the ActiveX control?. I need the
methods, properties and events of the ActiveX.
Levi
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Are you wanting to add this as a server-side object (for data processing, etc.) or so the client (browser) sees it? If the latter is the case, you don't do anything on the server side. Embed it on the web page and rely upon client-side scripting like Javascript and VBScript. These are two distinct contexts that must be understood. The server processes the page which produces HTML. That HTML is downloaded to the client to display. Everything you see in a browser is resident in memory on the client.
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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How Can we process a html document in windows application and display a html document in windows application
Thanx
Inam
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What do you mean by "process". You mean like replace variables and what not? Just read it in with a TextReader or something similar.
To display it, the most common method is to embed the WebControl, the HTML rendering and default MSHTML handler for Internet Explorer (also dubbed Internet Explorer, even though that technically refers to iexplore.exe, which is merely a COM container for the WebBrowser control).
Open your Windows Form. Show the toolbox, right-click and select "Customize Toolbox". Under the COM tab, find the Microsoft Web Browser control and add it. Then drag this onto your form and start programming. VS.NET will automatically import the typelib for the WebBrowser2 control as an RCW (runtime callable wrapper). Do actually access the HTML DOM, you need to reference Microsoft.mshtml.dll, which is an RCW for the entire mshtml.dll native library on Windows (which the WebBrowser control actually hosts and provides default functionality for links and what-not).
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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i was reading this:
http://www.codeproject.com/csharp/trayiconmenu01.asp
and it said to put this:
m_notifyicon = new NotifyIcon();
m_notifyicon.Text = "Hello, what's cooking?";
m_notifyicon.Visible = true;
m_notifyicon.Icon = new Icon(GetType(),"Icon1.ico");
in the "form object's constructor"
Where is that??
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Um...if you don't know what a constructor is, you really need to read the product documentation (.NET Framework, VS.NET documentation, or any book on object-oriented programming!). You won't get far at all without knowing the basics of object-oriented programming. There's plenty of books on the subject.
A constructor initializes a class to make an instance. See the new NotifyIcon statement? Without a constructor (that took zero params), you couldn't create an instance of that class (object). Your form's constructor is like so:
public class MyForm : Form
{
public MyForm()
{
}
}
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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i want to make my richtextbox class inherited from system.windows.forms.richtextbox class, wich will show pages, pagenumbers and more...(how ms word print layout).
but i have no ideas to make this.
if you know how make this please help me
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How can I call a OCX method into a WEB project? I try, but a unreferencial object error appear.
Thank you!!
aLeXs
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Sounds like you didn't instantiate the control. It looks like you got a NullReferenceException? Just 'new it up' like every other class:
MyOCXClass ocx = new MyOCXClass(); Adding a COM control to your .NET projects in VS.NET automatically creates a Runtime Callable Wrapper (RCW), which is what MyOCXClass is (assuming your OCX is named "MyOCX"). It also imports all the interfaces, enums, structs, etc. that are defined for the object(s).
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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Has anyone noticed anything strange happening when you try to use the ref statement to pass a parameter while in a sub-thread?
Here's what I did:
<br />
public void ThreadProc()<br />
{<br />
byte[] data=new byte[7];<br />
data[0]=0;<br />
data[1]=0;<br />
data[2]=1;<br />
data[3]=0;<br />
data[4]=1;<br />
data[5]=7;<br />
data[6]=7;<br />
<br />
chip1.WriteSPI(ref data[0], 7);<br />
}
where ThreadProc is called when I start a new thread:
<br />
thread1=new System.Threading.Thread(new ThreadStart(ThreadProc));<br />
thread1.Priority=System.Threading.ThreadPriority.Lowest;<br />
thread1.Start();
chip1.WriteSPI(ref byte datain, datasize) calls a COM object method that writes a stream of bytes on the USB port to a device downstream. It uses the reference as a pointer to the byte array.
All of this works fine in the main part of my app, but when I try to put it in a separate thread it writes garbage data to the port (actually it keeps writing the same garbage data every time). Has anyone done anything like this? Please feel free to point out my gross ignorance where appropriate.
Thanks
JR
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Is your COM object implemeneted as an STA or an MTA? If it's an STA, threading it can lead to unknown results. Marshalling could also be the culprit. If you're not marshalling the data correctly, its representation in the other context might not be correct and would produce garbage (right memory, wrong structure).
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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My COM object is not implemented as an STA.
so if it's marshalling, what can I do? (I know there probably isn't a short answer)
thanks.
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