[Class category] Controls [Details] 
The System.Windows.Forms namespace provides a variety of control classes that you can use to create rich user interfaces. Some controls are designed for data entry within the application, such as TextBox and ComboBox controls. Other controls display application data, such as Label and ListView. The namespace also provides controls for invoking commands within the application, such as Button. The WebBrowser control and managed HTML classes, such as HtmlDocument, let you display and manipulate HTML pages within your managed Windows Forms application. The MaskedTextBox control is an advanced data entry control that lets you define masks that automatically accept or reject user input. Additionally, you can use the PropertyGrid control to create your own Windows Forms Designer that displays the designer-visible properties of the controls.