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EventLog::MaximumKilobytes Property

Gets or sets the maximum event log size in kilobytes.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

property long long MaximumKilobytes {
	long long get ();
	void set (long long value);

Property Value

Type: System::Int64
The maximum event log size in kilobytes. The default is 512, indicating a maximum file size of 512 kilobytes.


The specified value is less than 64, or greater than 4194240, or not an even multiple of 64.


The Log value is not a valid log name.

- or -

The registry key for the event log could not be opened on the target computer.

The MaximumKilobytes property represents the size limit of the event log file. When the event log reaches the size limit, the configured OverflowAction value determines whether new entries are discarded, or whether new entries overwrite older entries.


This property represents a configuration setting for the event log represented by this instance. When the event log reaches its maximum size, this property specifies how the operating system handles new entries written by all event sources registered for the event log.

The following example enumerates the event logs defined on the local computer, and displays configuration details for each event log.

void DisplayEventLogProperties()

   // Iterate through the current set of event log files,
   // displaying the property settings for each file.
   array<EventLog^>^eventLogs = EventLog::GetEventLogs();
   System::Collections::IEnumerator^ myEnum = eventLogs->GetEnumerator();
   while ( myEnum->MoveNext() )
      EventLog^ e = safe_cast<EventLog^>(myEnum->Current);
      Int64 sizeKB = 0;
      Console::WriteLine( "{0}:", e->LogDisplayName );
      Console::WriteLine( "  Log name = \t\t {0}", e->Log );
      Console::WriteLine( "  Number of event log entries = {0}", e->Entries->Count );

      // Determine if there is a file for this event log.
      RegistryKey ^ regEventLog = Registry::LocalMachine->OpenSubKey( String::Format( "System\\CurrentControlSet\\Services\\EventLog\\{0}", e->Log ) );
      if ( regEventLog )
         Object^ temp = regEventLog->GetValue( "File" );
         if ( temp != nullptr )
            Console::WriteLine( "  Log file path = \t {0}", temp );
            FileInfo^ file = gcnew FileInfo( temp->ToString() );

            // Get the current size of the event log file.
            if ( file->Exists )
               sizeKB = file->Length / 1024;
               if ( (file->Length % 1024) != 0 )
               Console::WriteLine( "  Current size = \t {0} kilobytes", sizeKB );
            Console::WriteLine( "  Log file path = \t <not set>" );

      // Display the maximum size and overflow settings.
      sizeKB = e->MaximumKilobytes;
      Console::WriteLine( "  Maximum size = \t {0} kilobytes", sizeKB );
      Console::WriteLine( "  Overflow setting = \t {0}", e->OverflowAction );
      switch ( e->OverflowAction )
         case OverflowAction::OverwriteOlder:
            Console::WriteLine( "\t Entries are retained a minimum of {0} days.", e->MinimumRetentionDays );

         case OverflowAction::DoNotOverwrite:
            Console::WriteLine( "\t Older entries are not overwritten." );

         case OverflowAction::OverwriteAsNeeded:
            Console::WriteLine( "\t If number of entries equals max size limit, a new event log entry overwrites the oldest entry." );


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.