System.Diagnostics (system.dll)enum

This enumeration represents the different priorities given to a process. Process priorities, along with thread priorities, determine how processor time is allocated. Most processes run with Normal priority. Use Idle to specify that processor time should be allocated to a process only when the processor is idle. AboveNormal and BelowNormal allow you to set priorities slightly above or below Normal, but are not supported by Windows 95, 98, or Me. An exception is thrown if you attempt to use them.

High should be used only for time-critical tasks, but use care in choosing this priority because little time will be available to other applications. RealTime is the maximum allowable priority. When this priority is used, the process runs with higher priority than even the operating system. Assigning High and RealTime to a process will almost certainly make your system's user interface unresponsive. For this reason, be careful when using these.

public enum ProcessPriorityClass {
   Normal = 32,
   Idle = 64,
   High = 128,
   RealTime = 256,
   BelowNormal = 16384,
   AboveNormal = 32768


System.Object System.ValueType System.Enum(System.IComparable, System.IFormattable, System.IConvertible) ProcessPriorityClass

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    Part II: Programming with the .NET Framework
    Part IV: API Quick Reference
    Chapter 26. System