User Controls not showing up in the toolbox

Question

I have some UserControls that I created in ProjectA. I have ProjectB that has a windows form that I want to put the controls on. Both of these projects are in a single sol

Answer 1

When I tried to add my UserControl to the toolbox (right click toolbox, choose items, select my DLL) it would display a message saying there were no controls in my DLL.

Anyway, the problem was solved, by trying to create a form in my DLL in VS and adding the UserControl. An error message displayed saying there was no default constructor

public UserControl() {
...
}

The designer needs this because it can't know what valid arguments are. Once I added a blank constructor to the UserControl it was added to the toolbox without issue.