Solved

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

Posted on 2007-04-10
1
1,292 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

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

We were having a lot of "Heartbeat Alerts" in our SCOM environment, now "Heartbeat" in a SCOM environment for those of you who might not be familiar with SCOM is a packet of data sent from the agent to the management server on a regular basis, basic…
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.
The viewer will learn how to create a normally distributed random variable in Excel, use a normal distribution to simulate the return on an investment over a period of years, Create a Monte Carlo simulation using a normal random variable, and calcul…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

856 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