C# 怎么判断DLL被调用

我想调用厂家给的DLL实现与开发板的CAN通信，DLL调用是成功的，我的程序能够通过DLL中的方法打开CAN卡设备和通道，但是不能发送数据，下面是我发送数据的一些代码：
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct CAN_DataFrame
{
public UInt32 uID
public UInt32 uTimeFlag;
public byte nSendType
public byte bRemoteFlag
public byte bExternFlag
public byte nDataLen
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] arrayData
}
const string PATH = "D:\\chongdianji_dll\\CanCmd.dll";
[DllImport(PATH, EntryPoint = "CAN_ChannelSend")]
public static extern int CAN_ChannelSend(uint dwDeviceHandle, uint dwChannel,ref CAN_DataFrame[] can_DF, UInt32 nCount)
CAN_DataFrame[] SendBuff = new CAN_DataFrame[1]
SendBuff[0] = new CAN_DataFrame()
string strSendID = "00000a0f"
string strSendData = "01 02 03 04 05 06 07 08"
SendBuff[0].nSendType = 1
SendBuff[0].bRemoteFlag = 1
SendBuff[0].nDataLen = 8
SendBuff[0].bExternFlag = 1
CAN_ChannelSend(can_DO, 0,ref SendBuff, 1)

飘过,我以前公司的同事会

[dllimport("your.dll", entrypoint = "yourfunc")]

//这里声明那个函数，注意类型转换 包括结构体什么的，都要自己在c#里面重新声明和定义

public static extern void clientdll_destory(clientdll_hdvssession hclienthandle);

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