Control Help Using ToolTips
The ToolTip component can be used to display a brief, specialized help message for individual controls on Windows Forms. The ToolTip component provides a property that specifies the text displayed for each control on the form. For more information on working with the ToolTip component in this fashion, see Setting ToolTips for Controls on a Windows Form. Additionally, the ToolTip component can be configured such that there is a delay before it is shown. For more information, see Changing the Delay of the Windows Forms ToolTip Component.