asp.net 2.0+c# 调用dll

Question

serial.dll是个window32dll,在delphi下如下注册后能调用.
DiskDLLName = 'serial.dll';
procedure GetCDROMVolume(pDriver:pChar);stdcall;external DiskDLLName;
procedure GetDiskSerialNo(pDrv,pSerial:pChar);stdcall;external DiskDLLName;我在c#中如下调用
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Runtime.InteropServices;
public partial class _Default : System.Web.UI.Page 
{
    [DllImport("Serial.dll")]
    public static extern void GetCDROMVolume(out string pDriver);    protected void Page_Load(object sender, EventArgs e)
    {
        string pDriver;
        GetCDROMVolume(out pDriver);
        Response.Write(pDriver);    }
}
报错如下:无法加载 DLL“C:\Documents and Settings\Administrator\My Documents\Visual Studio 2005\WebSites\WebSite1\Bin\Serial.dll”: 找不到指定的模块。 (异常来自 HRESULT:0x8007007E)。
为什么,请帮助??

Answer 1

是不是没在下面引用！
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Runtime.InteropServices;
 例如using serial