asp.net 调用 delphi 写的 dll 报错， 请高人指点

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System error：
System error occurs， the information system records, please try again later or contact your administrator.

Error message： Unable to load DLL 'DLLDecrypt.dll ': Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))Stack Trace:

System.DllNotFoundException: Unable to load DLL 'DLLDecrypt.dll ': Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)) at NKE.Common.ivocallMethod.DecryptDBKey(String KeyStr, String EncryptStr) at NKE.DBUtility.PubConstant.IvoCallClientConnectionString() at NKE.DBUtility.IvoCallDbHelperSQLByLoginClientDB.Query(String SQLString) at NKE.DAL.IvocallCampaigns.GetView(String viewname, String strWhere) at NKE.BLL.IvocallCampaigns.GetView(String viewname, String strWhere) at NKE.Web.synchroIvocall.ivoCallCampaigns.bandcampaigns() at NKE.Web.synchroIvocall.ivoCallCampaigns.Page_Load(Object sender, EventArgs e) at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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补充： 本地调用没问题，放到服务器的bin目录后，就出现上述问题

[bdmh]

System.DllNotFoundException，没找到dll，你检查路径吧，asp中路径不要写成绝对的

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非托管调用，像这样
[DllImport(@"DLLDecrypt.dll ", EntryPoint = "DecryptDBKey", CharSet = CharSet.Ansi)]
public static extern string DecryptDBKey(string KeyStr, string EncryptStr);

关键本地调试可以