Re: Synchronisation in Multi Server environment - C# Discussion Boards

dataminers25-Dec-09 1:35

25-Dec-09 1:35

I wrote a word in the RichTextBox, this word represent an object. I want to click this object.

For example; I wrote following text to RichTextBox;

Hello codeproject members.

I want to "codeproject" word represent an object. May be get ID when click to this word.

How can I do? Thanks...

Re: RichTextBox - Text

santhosh-padamatinti26-Dec-09 7:17

santhosh-padamatinti

26-Dec-09 7:17

Hi,

Try like this may be its not correct approach. But it solves your problem.

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string s1 = this.richTextBox1.Text;
            sample o1 = new sample();
            o1.sobject = s1;   
        }

    }
    public class sample
    {
        public string sobject;
       
    }

To invent something, you need a mountain of junk in your mind.
---------------------Thomas alva edison

Re: RichTextBox - Text

dataminers29-Dec-09 22:45

dataminers

29-Dec-09 22:45

Program how to interact when cursor on this word?

Display user control in place of default tooltip

billu 225-Dec-09 1:16

billu 2

25-Dec-09 1:16

i want to display a user control in place of default tooltip displayed.
Can smebody help me with the code????

thanks in advance....

Re: Display user control in place of default tooltip

Abhijit Jana25-Dec-09 1:42

Abhijit Jana

25-Dec-09 1:42

For which control you want to do that ? You can trap Mouse move event and show some user control on mouse move. Smile | :)

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.

Re: Display user control in place of default tooltip

billu 225-Dec-09 1:53

billu 2

25-Dec-09 1:53

i want to do this for picture box.
can u plz help wid the code snipet????
thanks....

Synchronisation in Multi Server environment

c0der200925-Dec-09 1:11

c0der2009

25-Dec-09 1:11

I have a process which can be run from any number of servers. All of them access the same database. How do I synchronize the severs data access?

Here are the details.

My common database server has a table T1. It has columns C1, C2 and C3.

My process has the following steps.
1. Read T1 table.
2. If there is any row with value V1 for C1, wait in a loop and go to step-1.
3. If there are no such rows, insert a row with V1 for C1 and appropriate values for the rest of the columns.
4. Start my business logic.
5. Once the business logic is complete, delete the row entered in step-3.

Now the same process runs from different servers. So there is a chance that 2 or more processes will do steps 1 and 2 simultaneously and might end up creating 2 or more rows with V1 value for C1. I don't want that to happen. How will I make sure only once process can perform steps 1 and 2 at a time? I can not use lock and monitor to synchronize the access as I am running from different process spaces.

How do I do it then?

Re: Synchronisation in Multi Server environment

Jimmanuel25-Dec-09 7:07

Jimmanuel

25-Dec-09 7:07

One way would be to create a separate table in the DB for locks (or just reuse the existing one). Before a process starts step 3 (or whatever the crucial step is) it checks that table for a well known value, if it exists then it knows that some other process has started business logic and it should wait. If the lock value isn't found then it can create it and continue on. The lock value that it created will signal other processes that it is currently executing business logic and they should wait.

This will work if the DB column that you're using for a lock is properly setup with a primary key constraint. If two processes try to write the same value into a PK column at (nearly) the same time the first will succeed and the other will throw an exception.

Another "Outside the Database" solution would be to make all of the processes communicate with each other via some other mechanism (sockets, MSMQ, File IO, etc) and work out that way which one should be doing what.

Re: Synchronisation in Multi Server environment

c0der200925-Dec-09 20:36

c0der2009

25-Dec-09 20:36

Thanks Jimmanuel for the reply. It gives some good pointers.

I am more interested in the "Outside the Database" solutions. I suppose there are no design patterns as such which cover this scenario. Right?

Re: Synchronisation in Multi Server environment

Jimmanuel26-Dec-09 2:35

Jimmanuel

26-Dec-09 2:35

Sure there are, look up "concurrency[^]", "transactions[^]", "inter-process communication[^]" (aka IPC) and "messaging systems[^]". I haven't looked for the others but I know that there's a decent IPC article on CP somewhere.

If you have lots of time to read, this[^] book has a chapter about transactions and concurrency and this[^] is entirely about building applications and messaging protocols in distributed systems.

Badger | [badger,badger,badger,badger...]

Badger | [badger,badger,badger,badger...]

Re: Synchronisation in Multi Server environment

c0der200927-Dec-09 18:14

c0der2009

27-Dec-09 18:14

Thank you very much. Really helpful leads.

Re: Synchronisation in Multi Server environment

Jimmanuel28-Dec-09 0:51

Jimmanuel

28-Dec-09 0:51

Glad to help Smile | :)

is there any binary to decimal convertor class

hotthoughtguy25-Dec-09 0:15

hotthoughtguy

25-Dec-09 0:15

such as, if i want to convert 240 in binary,octal, hex and vice versa

repost

Luc Pattyn25-Dec-09 1:19

Luc Pattyn

25-Dec-09 1:19

asked and answered[^] three days ago.

Hmmm | :|

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Merry Christmas and a Happy New Year to all.

Re: repost

#realJSOP25-Dec-09 22:51

#realJSOP

25-Dec-09 22:51

The Indian universities must have started a new semester...

.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

Re: repost

dan!sh 25-Dec-09 23:02

dan!sh

25-Dec-09 23:02

Not exactly. It should be examination time in many of the universities here. Project submission dates approaching fast, very fast.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Access the path geometry using C#

sajib_bd24-Dec-09 21:22

sajib_bd

24-Dec-09 21:22

i have created a segment by using the following code.

Data="M0.5,0.5
L23.877726,0.5 23.912098,1.4036387
C27.248646,67.155535 81.673632,119.5 148.25,119.5 214.82637,119.5 269.25135,67.155535 272.58789,1.4036387 L272.62229,0.5 297.1016,0.5 297.05591,1.7070469 C293.06088,80.831659 227.88823,143.5 147.75,143.5 74.074534,143.5 13.048166,90.531885 0.58002052,20.504782
L0.5,20.020197 z" />;

now from C#, i want to change the color of that segment from black to blue.

how can i make that change? please give me the solution with sample code.

Re: Access the path geometry using C#

Abhinav S25-Dec-09 0:12

Abhinav S

25-Dec-09 0:12

Are you working with WPF or Silverlight?
Next time, post in the appropriate forum. It may help you get an answer faster.

Now, for the question, I dont think you can change the color just by looking at the path text. Try changing the color of the path object by itself.

There's nothing left in my right brain and nothing right in my left brain.

Table in tooltip

billu 224-Dec-09 19:35

billu 2

24-Dec-09 19:35

i want to display a 3 row,2 column table in the tooltip used for a user control.
can smeone help me with the code????

thanks in advance....

Re: Table in tooltip

NarendraSinghJTV25-Dec-09 22:28

NarendraSinghJTV

25-Dec-09 22:28

Try this link

CPPToolTip v2.1[^]

please click answered if it helps you

Regards
Narendra Singh
(Jindal Tech Ventures)

Catchy title needed

Yosh_24-Dec-09 9:54

Yosh_

24-Dec-09 9:54

Hey Guys,
I've been given an assignment to organize a programming seminar next January. It's supposed to be for young people who have interest in programming, just need to be convinced. However, i need a catchy title for the seminar. Help please.

He who goes for revenge must first dig two graves.

Re: Catchy title needed

OriginalGriff24-Dec-09 10:22

OriginalGriff

24-Dec-09 10:22

How about "I didn't get what I wanted in the lounge so I'll try all the other forums?"

All those who believe in psycho kinesis, raise my hand.

Re: Catchy title needed

CoderGirl4224-Dec-09 10:53

CoderGirl42

24-Dec-09 10:53

Have you considered using "Free Beer" as the title?