asp.net报“AccessViolationException”错误,求高手帮忙

应用程序日志如下：
事件代码: 3005 
事件消息: 发生了未处理的异常。 
事件时间: 2011-2-23 9:12:04 
事件时间(UTC): 2011-2-23 1:12:04 
事件 ID: e05e7297a40146658def55ed7f2c1e4e 
事件序列: 537 
事件匹配项: 1 
事件详细信息代码: 0 
 
应用程序信息: 
    应用程序域: /LM/W3SVC/1933152039/Root-1-129428963211718750 
    信任级别: Full 
    应用程序虚拟路径: / 
    应用程序路径: E:\Web\E7HR\E7Test01\ 
    计算机名: AA-C91FHE6CKN6Y 
 
进程信息: 
    进程 ID: 4028 
    进程名: w3wp.exe 
    帐户名: NT AUTHORITY\SYSTEM 
 
异常信息: 
    异常类型: AccessViolationException 
    异常消息: 尝试读取或写入受保护的内存。这通常指示其他内存已损坏。 
 
请求信息: 
    请求 URL: http://192.168.1.88:8002/Timecard/Machine_Info.aspx 
    请求路径: /Timecard/Machine_Info.aspx 
    用户主机地址: 192.168.1.1
    用户:  
    是否已经过身份验证: False 
    身份验证类型:  
    线程帐户名: NT AUTHORITY\SYSTEM 
 
线程信息: 
    线程 ID: 5 
    线程帐户名: NT AUTHORITY\SYSTEM 
    是否正在模拟: False 
    堆栈跟踪:    在 System.Web.Util.StringUtil.memcpyimpl(Byte* src, Byte* dest, Int32 len)
   在 System.Web.Util.Misc.CopyMemory(IntPtr src, Int32 srcOffset, IntPtr dest, Int32 destOffset, Int32 size)
   在 System.Web.HttpResponseUnmanagedBufferElement.Append(IntPtr data, Int32 offset, Int32 size)
   在 System.Web.HttpWriter.BufferResource(IntPtr data, Int32 offset, Int32 size)
   在 System.Web.HttpWriter.WriteUTF8ResourceString(IntPtr pv, Int32 offset, Int32 size, Boolean asciiOnly)
   在 System.Web.UI.HtmlTextWriter.WriteUTF8ResourceString(IntPtr pv, Int32 offset, Int32 size, Boolean fAsciiOnly)
   在 System.Web.UI.ResourceBasedLiteralControl.Render(HtmlTextWriter output)
   在 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   在 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   在 System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
   在 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   在 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
   在 System.Web.UI.HtmlControls.HtmlHead.RenderChildren(HtmlTextWriter writer)
   在 System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer)
   在 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   在 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   在 System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
   在 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   在 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
   在 System.Web.UI.Page.Render(HtmlTextWriter writer)
   在 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   在 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   在 System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
   在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)