error LNK2020 unresolved token(06000006)HostInfo::SetHostInfoData Visual Studio C++

Hi i have created a project using Visual Studio c++ and i am getting this error!
error LNK2020 unresolved token(06000006)HostInfo::SetHostInfoData

I have a Header file named HostInfo.h i also have a cpp file named HostInfo.cpp.
in the cpp file i have included the header file like so, #include "HostInfo.h"

But it does not seem to be linking to it, i dont know why, can anyone help?

I have included the code for both header and cpp if you want to see it

Header file

#pragma once

using namespace System;
using namespace System::Diagnostics;
using namespace Microsoft::DirectX::DirectPlay;

public __gc class HostInfo
{
 //public class methods and data members
public:
      bool Equals(System::Object *obj);
      int GetHashCode();
      String* ToString();

      HostInfo();

      HostInfo(Guid gu, Address *addr, String *SessName);

      bool SetHostInfoData(Guid gu, Address *addr, String *SessName);
      System::Void SetGuid(Guid gu);
      Guid GetGuid();
      

      System::Void SetAddress(Address *addr);
      Address* GetAddress();

      System::Void SetSessionName(String *name);
      String *GetSessionName();
private:
            Guid GuidInstance;                  
            Address *HostAddress;            
            String *SessionName;      

};


##############

cpp file

#include "stdafx.h"
#include "HostInfo.h"  // I think it does not seem to pick this up

HostInfo::HostInfo()
{

}


HostInfo::HostInfo(Guid gu, Address *addr, String *SessName)
{
      this->GuidInstance = gu;
      this->HostAddress = addr;
      this->SessionName = SessName;
}


bool HostInfo::Equals(System::Object *obj)
{
      HostInfo *node = dynamic_cast<HostInfo*>(obj);
      return Guid::op_Equality(GuidInstance, node->GuidInstance);

}

int HostInfo::GetHashCode()
{
      return this->GuidInstance.GetHashCode();
}

String * HostInfo::ToString()
{
      String *displayString;
      if(this->SessionName->Length==0) //check if we have a session

      {
            displayString ="<unnamed>";
      }
      else
      {
            displayString->Concat(this->SessionName);
            displayString->Concat("(" , HostAddress->GetComponentString("hostname"));
            displayString->Concat(":" , Convert::ToString(HostAddress->GetComponentInteger("port")), ")");
      }
      return displayString;

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