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The SystemInformation.MouseWheelScrollLines property indicates how many lines to scroll, by default, in a multi-line control that has a scroll bar. The corresponding Platform SDK system-wide parameters are SPI_GETWHEELSCROLLLINES and SPI_SETWHEELSCROLLLINES. For more information about system-wide parameters, see "SystemParametersInfo" in the Platform SDK documentation at tp://msdn.microsoft.com/.
Be sure to handle the special case that occurs if the "One screen at a time" mouse option is selected. In this case, the SystemInformation.MouseWheelScrollLines property has a value of -1.