Slow showing / drawing dialogue with ListBox?

Question

My application uses entity framework to pull in a small tiny set of results... It takes about 3 seconds for it to do it? Why might this be?

Start.cs

Answer 1

The ListBox has to redraw every time you add an item. You can either use Dmitry's method of using AddRange(), or you can wrap your loop with BeginUpdate()/EndUpdate() calls.

ListBoxProjectType.BeginUpdate();

foreach( var projectType in projectTypes )
{
    ListBoxProjectType.Items.Add(projectType.Title);
}

ListBoxProjectType.EndUpdate();