multithreading to faster search string from textbox.....?

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hi,
i have one listbox contain 70000 items (70k)..

and one textbox ...

how to search a string in textbox match with listbox items ...

textbox contains 500 lines...

i used multi threading to fast search and it does work but as m using multithreading form which has 6 sub ... all sub started at the same tym but it not ended at the same tym ....

m using
if textbox1.contain(listbox1.items) then
msgbox("")
else
Msgbox("")
end if

thanxxs in advance

Posted 18-May-15 4:00am

Member 10521418

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Comments

Sascha Lefèvre 18-May-15 10:32am

What's your question, exactly?

Tomas Takac 18-May-15 10:53am

I think the real question is: do you really need 70k items in a combobox?

Sascha Lefèvre 18-May-15 11:07am

:thumbsup:

Member 10521418 18-May-15 11:09am

thumbsup for wat sascha

Member 10521418 18-May-15 11:11am

m using multithreading form okk and if i use only one sub for searching 1 to 10k it takes 5 sec but when i use 5 sub it takes 18 sec thats the question i asked ....

Sascha Lefèvre 18-May-15 11:16am

But that's a statement, not a question..

Member 10521418 18-May-15 11:24am

okk my question is faster way to search string using vb.net platform ... do u have any sujjection ot just u r here for tym pass ....

Sascha Lefèvre 18-May-15 11:26am

You want it even faster than 18 seconds?

Member 10521418 18-May-15 11:27am

yes i want less then 5 sec

Sascha Lefèvre 18-May-15 11:29am

Alright - that's what you should have said in the first place. You'll have to show us your code so we can identify how it could be improved.

Member 10521418 18-May-15 11:33am

m using .contain method but it is slow and as well i also tried indexof method but the same result ....

Member 10521418 18-May-15 11:35am

is there any way
to search all items at once instead of one by one ....

Sascha Lefèvre 18-May-15 11:58am

- Where do your strings come from? Database / plain text file / other?
- Can the substrings you're searching for occur anywhere within a string or only at the start or end?

Member 10521418 18-May-15 11:08am

then ever else i put items ... listbox is the only control i guess ....

virusstorm 18-May-15 14:20pm

I have to agree with the previous comments, why do you have 70K entries in a ListBox? How is that even usable?

The real problem you are going to run into is making the ListBox control thread safe (which isn't fun). Your best bet to build a faster search is to build a hash table of some kind to find the values quickly.

Ralf Meier 19-May-15 1:07am

I'm not complete sure but I think that this is the same Problem and question as a few weeks ago ...
My Suggestion at that time was nearly the same.
The Thread-Starter need to create a Special algorhytm and (my oppinion) should cut himself from the Listbox.

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