|   Alert | The Alert level designates very severe error events. Take immediate action, alerts. | 
|   All | The All level designates the lowest level possible. | 
|   Critical | The Critical level designates very severe error events. Critical condition, critical. | 
|   Debug | The Debug level designates fine-grained informational events that are most useful to debug an application. | 
|   Emergency | The Emergency level designates very severe error events. System unusable, emergencies. | 
|   Error | The Error level designates error events that might still allow the application to continue running. | 
|   Fatal | The Fatal level designates very severe error events that will presumably lead the application to abort. | 
|   Fine | The Fine level designates fine-grained informational events that are most useful to debug an application. | 
|   Finer | The Finer level designates fine-grained informational events that are most useful to debug an application. | 
|   Finest | The Finest level designates fine-grained informational events that are most useful to debug an application. | 
|   Info | The Info level designates informational messages that highlight the progress of the application at coarse-grained level. | 
|   Notice | The Notice level designates informational messages that highlight the progress of the application at the highest level. | 
|   Off | The Off level designates a higher level than all the rest. | 
|   Severe | The Severe level designates very severe error events. | 
|   Trace | The Trace level designates fine-grained informational events that are most useful to debug an application. | 
|   Verbose | The Verbose level designates fine-grained informational events that are most useful to debug an application. | 
|   Warn | The Warn level designates potentially harmful situations. | 
|   Equality Operator | Returns a value indicating whether two specified Level objects have the same value. | 
|   Greater Than Operator | Returns a value indicating whether a specified Level is greater than another specified Level. | 
|   Greater Than Or Equal Operator | Returns a value indicating whether a specified Level is greater than or equal to another specified Level. | 
|   Inequality Operator | Returns a value indicating whether two specified Level objects have different values. | 
|   Less Than Operator | Returns a value indicating whether a specified Level is less than another specified Level. | 
|   Less Than Or Equal Operator | Returns a value indicating whether a specified Level is less than or equal to another specified Level. | 
|  Level | Overloaded. Initializes a new instance of the Level class. | 
|  DisplayName | Gets the display name of this level. | 
|  Name | Gets the name of this level. | 
|  Value | Gets the value of this level. | 
|  CompareTo | Compares this instance to a specified object and returns an indication of their relative values. | 
|  Equals | Compares levels. | 
|  GetHashCode | Returns a hash code | 
|  GetType (inherited from Object) | Gets the Type of the current instance. | 
|  ToString | Returns the String representation of the current Level. | 
Level Class | log4net.Core Namespace