Question

I’m extending the ComboBox class in VB.NET and I’m running into a problem prepopulating the collection. I try to do so by using Me.Items.Add() calls in the New() sub. However, once I place the control on a form in the form designer, Visual Studio automatically adds those items to the collection in form designer, then they are added again at runtime. How can I make them only added once?

Answer 1

i think you have to check DesignMode property.

in Constructor code you have to add

if (LicenseManager.UsageMode != LicenseUsageMode.Designtime) then
    this.Items.Add("test")
endif

if( not DesignMode) then ' not working
    //add your items
endif