Solved

VB.Net - Loading large amounts of data into a combobox.

Posted on 2007-04-10
1
1,282 Views
Last Modified: 2008-01-09
Hello,
I have a VB.Net application in which I have several comboboxes on a form that contain a large about of data, about 13,000 rows each.  The query which retrieves the data is very fast.  Here is an example of my code that populates  8 combo boxes.
 
dsDxs = cCSharedFunction.getDx()
dsDX1 = dsDxs.Copy()
dsDX2 = dsDxs.Copy()
dsDX3 = dsDxs.Copy()
dsDX4 = dsDxs.Copy()

With UcDx1.cmbDX1
            .DataSource = dsDX1.Tables(0)
            .DisplayMember = "Dx"
            .ValueMember = "Description"
End With

With UcDx1.cmbDX1Desc
            .DataSource = dsDX1.Tables(0)
            .DisplayMember = "Description"
            .ValueMember = "Dx"
End With

With UcDx1.cmbDX2
            .DataSource = dsDX2.Tables(0)
            .DisplayMember = "Dx"
            .ValueMember = "Description"
End With

With UcDx1.cmbDX2Desc
            .DataSource = dsDX2.Tables(0)
            .DisplayMember = "Description"
            .ValueMember = "Dx"
End With

With UcDx1.cmbDX3
            .DataSource = dsDX3.Tables(0)
            .DisplayMember = "Dx"
            .ValueMember = "Description"
End With

With UcDx1.cmbDX3Desc
            .DataSource = dsDX3.Tables(0)
            .DisplayMember = "Description"
            .ValueMember = "Dx"
End With

With UcDx1.cmbDX4
            .DataSource = dsDX4.Tables(0)
            .DisplayMember = "Dx"
            .ValueMember = "Description"
End With

With UcDx1.cmbDX4Desc
            .DataSource = dsDX4.Tables(0)
            .DisplayMember = "Description"
            .ValueMember = "Dx"
End With

Any help to speed up the load of these controls would be greatly appreciated.

Thanks in advance.
0
Comment
Question by:mocaiv
1 Comment
 
LVL 22

Accepted Solution

by:
_TAD_ earned 500 total points
ID: 18883210

13,000 rows in a combo box?  That just doesn't sound like a good idea.  I mean, the whole idea behind a combo box is to allow someone to choose a value.  Choosing from 13,000 possible choices is just too much.

However, that being said, if you really want to improve performance you need to first look at your CPU usage and RAM usage.  If CPU is at 100% and RAM is swapping pages like crazy during this process, then there is nothing you can do.

On the other hand, if CPU and RAM are low throughout the loading process, then I would suggest multi-threading your application.

Create a delegate that will do the databinding for you.  That way you don't have to wait for each one to complete before starting the next one.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A theme is a collection of property settings that allow you to define the look of pages and controls, and then apply the look consistently across pages in an application. Themes can be made up of a set of elements: skins, style sheets, images, and o…
Article by: Leon
Software Metering within our group of companies has always been an afterthought until auditing of software and licensing became a pain point. Orchestrator and SCCM metering gave us the answer and it was an exciting process.
Viewers will learn the different options available in the Backstage view in Excel 2013.
The viewer will learn how to simulate a series of sales calls dependent on a single skill level and learn how to simulate a series of sales calls dependent on two skill levels. Simulating Independent Sales Calls: Enter .75 into cell C2 – “skill leve…

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now