StringBuilder sb = new StringBuilder();
EventLog mylog = new EventLog();
mylog.Log = "Application";  // System[系统日志] | Application[应用日志] | Security[安全日志]
EventLogEntryCollection myCollection = mylog.Entries;
for (int i = 0; i < myCollection.Count; i++)
{
    sb.Append("Time:" + myCollection[i].TimeGenerated + " " +
        myCollection[i].Message + "<br />");
}