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Thanks alot abdallah for your help, it worked great.
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:->hi every one ,
i need some info. about rational rose model , its related with softwear eng.
so any info. will be usful for me .
my best Regards for all.
abdallah zaid
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:->thx for your help alexey ,
my regards.
abdallah ziad
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please give idea or any help this issue:
how to rotate images in cycle with link.
description:
iam developing project to the musium.There various type of ancient type Categoriesare available. I have devided all in 6 Categories,so i like to rotate all Categoriesin cycle with picture.further more each Category has link that related to other information. Please give Ideas to begin project.
Amal
SOFTWARE DEVELOPER
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hi Amal,
please clarify the terms you used: "rotate", "cycle" and "link"
did you mean with "rotate" turning clockwise and counter-clockwise an image canvas ?
or did you mean some sort of a CROSS JOIN between two entities ?
write in arabic if you like.
best regards.
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my project likes encanrta 2005 interface .
rotate -clockwise or unti clock wise
in Encarta 2005 images have been rotating with links,that each links has own information
plese urgent
Amal
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hi why don't u use an adrotator control.
hi to all
with regards,
susa
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Does anyone know how to synchronize two databases (prefarebly mySQL) on different servers through C#?
What confuses me most is the comparing of the two databases. Note that the two databases can have the same data due to previous synchronizations. Also, the two databases can have different data but the same primary key.
Thank you
Elaine
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Hi,
I already worked with C# a while and I'd like to generate documentation. I've seen you can use '///' to add info in XML-style. So the XML can be parsed by using for example NDoc.
Is NDoc the best tool to use to generate C# Documentation? Any other software that I should use? (NDoc projet is not being update lately...)
Any advice/suggestions are welcome 
Greetings,
Jens
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I think NDoc is the best choice.
--------------------------------------------------------
My development blog
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!
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I second NDoc, but as you have noticed they haven't released a binary for a while. Although there are currently working on a release for 2.0 framework features (like generics). I have a few c# 2.0 projects which could do with this.
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Hello,
Thanks for your time to read my request for a help. I developed my windows application with C#, which has many background workers working at the same time, opening and closing sql databases, modifying sql tables etc. Now, very often I get this error message, " There is already an open DataReader associated with this Command which must be closed first.". I dont know why its happenning sometimes and sometimes not. Is that the reason one thred and another thread conflicting each other when they try to read or modify same sql database ? And sometimes, I get some weired error saying "in order to execute the sqlcommand, connection must be open. ", And I dont see any reason why connection is getting closed before that sqlcommand execution. Now I had to place if(myConn.State == ConnectionState.Close) myConn.Open() ; before every sqlcommand. Even after that I am getting same error sometimes. Can anyone please give me some clue to solve and seal this problem permanently.
Thanks and regards
emran
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You can have any number of connections open to the database, so that is not the problem. The problem is most likely how you use the connection objects in your code. You can't share connetions between threads.
---
b { font-weight: normal; }
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the exception you're getting is probably when executing SQLCommands using "ExecuteDataReader" and openning the datareader while another data reader is already opened in another thread.
example of creating the exception:
thread 1 executes:
SqlDataReader dr = LocalSqlCommand.ExecuteDataRead();
dr.Open();
...
in the same time thread 2 tries to execute the same symmantec:
SqlDataReader dr = LocalSqlCommand.ExecuteDataRead()
dr.Open() -> this will generate the exception...
its a .NET limitation to open only one DataReader per application !!!
a workaround:
- always close the dataReader when finished by executing: dr.Close()
- try raising a flag between threads (mutex) so they block each other while they open and close DataReaders
best regards
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eyad al akhras wrote: its a .NET limitation to open only one DataReader per application !!!
No, not per application, but per connection. Not really a limitation, as you easily can open as many connections as you like.
---
b { font-weight: normal; }
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Hello,
Thanks for your reply. Actually I am using same instance of sqlconnection all over my code because, when I used different instance of sqlconnection, I face another problem. If One connection made a change in the database, another connection doesn't reflect the change. It still retrieive old values from SQL unless that connection itself did not do the changes in SQL. Is there any way to synchronize all changes made by different sql connection instances ?
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you're right Guffa, appologies for wrong contribution.
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Hello eyad al akhras ,
Thanks a lot for the reply.
Actually in one of my thread, I have a dataGrid bounded with a daasource, so, my application is considering that databounded datagrid as an open active datareader. And at the same time another thread is executing SQL command. And sometimes, When another thread is executing SQL command, when I try to click Update (or SAve) button of a databinding navigator (for my datagridview) I get the same error saying "already datareader open.". Is there any snippet available to solve this problem either using mutext or something else. I have never used lock, mutex etc in my code, I dont know how to use those.
Thanks and regards
Emran
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read these two article, found when searching codeProject for "Threads":
- "Synchronization Basics and Concept of Using a Synchronized Wrapper"
at http://www.codeproject.com/csharp/syncroot.asp
- and, for a Thread starter article: "Understanding Threading in .NET Framework"
at http://www.codeproject.com/csharp/threadinginnet.asp
I think you should, eventually, concentrate your efforts on wrapping the SqlCommand execution all over your code (even in the DB Navigator) to synchronize with other threads.
if you still feel stuck after reading the articles, i'll further explain.
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How can we edit a data grid in win application (VB/C#) like we do it easily
in asp.net by property builder wizard ?
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Can somebody please give me the example of operator overloading in C#
Thank You
Pankaj Garg
-- modified at 3:59 Sunday 23rd April, 2006
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What is the meaning of unmanaged code in VB.net and C#
and what is meaning of line that we can write the unmanaged code in c# and not in vb.net
Thank You
Pankaj Garg
-- modified at 3:59 Sunday 23rd April, 2006
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