Suspend Combo Box Event

Ryan Kotowski

Hello,
I am not an expert in VB.NET by any means. I just converted our VB 6 program to VB.NET in the last several months. In VB.NET, there are several events that I am utilizing that I didn't necessarly use before. Almost all of my combo boxes use the Click, KeyDown, LostFocus and SelectedValueChanged events. These are great when needed, but they slow everything down when I load up the form. I have dozens of combo boxes in my program...especiall my second screen.
I could be doing the Form_Load wrong, but when the form comes up I load the combo boxes using Items.Add. But, that always triggers the above events. Because of this (partly), my screen takes some 25-30 seconds to load. Since those events are unnecessary at Form_Load time, I was trying to figure out how to bypass them just in the Form_Load section.
I searced the internet the last 2 days for an understandable solution, but my limited VB knowledge maybe was getting in my way. Remove/Add Handler seemed to be a popular choice, but I don't know if that is what I should be using. If it is, what is a simple example of how to use them? I appreciate any help at this point. I have rolled out the program and I am getting a lot of grief for this long pause they are dealing with.

Thanks in advance,
Ryan

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Ryan Kotowski16y ago
Thank you for the suggestions. I rolled out my changes this weekend so we'll see how it goes. I think I made some progress for sure.
0
PJ Martins16y ago
your other options will be to not hook in the events at design time but rather at runtime at the end of your page load.
0
Ryan Kotowski16y ago
Yes, that was the only solution that I came up with as well. I didn't know if that would have a major impact since the program still goes to the events. But, I did implement that this morning just now. It had some impact, but I also found some other areas that were worse. I am making some progress. I would still be curious if there was a way to suspend the events on the combo box. I think some of my other areas in the program may be causing more of the problem though.
Thank you,

Ryan
0
PJ Martins16y ago
Use a boolean variable at the class level and set it to false. In each of your events check to see whether loaded is true, if it's not simply exit the sub. Once your form is done loading you can set this variable to true so that your events fill fire.
0