VB.Net调用WMI可以实现系统管理和系统信息查询等。msdn上只有C++和vbs脚本演示，乐博网在vbs脚本基础上将发布WMI系列文章演示如何将WMI应用到VB.Net上。

调试环境 vb2005  windows2003

VB.Net清理系统日志的方法

以下为清理Application （应用程序日志）的方法  可自行修改为系统日志或安全日志

代码如下：

 Private Sub Lobdotcn()

        Dim strComputer As String = "."
        Dim objWMIService As Object = GetObject("winmgmts:" _
            & "{impersonationLevel=impersonate}!\\" _
            & strComputer & "\root\cimv2")
        Dim objLogFile As Object
        Dim colLogFiles As Object = objWMIService.ExecQuery _
    ("Select * from Win32_NTEventLogFile " _
    & "Where LogFileName='Application'")
        For Each objLogFile In colLogFiles
            objLogFile.ClearEventLog()
            MsgBox("Cleared application event log file")
        Next

    End Sub