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

Try to replace adding individual items to listbox with AddRange:

public void ListBoxProjectTypes()
{
    IEnumerable projectTypes = projectTypeRepository.ProjectTypes;
    ListBoxProjectType.Items.AddRange(projectTypes.Select(item => (object)item.Title).ToArray());
}

Or simply wrap items adding with ListBoxProjectType.BeginUpdate and ListBoxProjectType.EndUpdate.