How to set description for my Custom Control to show in ToolBox?

Question

I want to add a text that tells the designer what my control is into my custom control when it is in design time. Like VS default controls in here:

Answer 1

You can decorate your class with Description attribute. Then when you add the control to toolbox using Choose Items ... or using a vsix package, the description will be shown as a tooltip for your control:

[Description("Some Description")]
public partial class UserControl1 : UserControl
{
}