Hi,I have met a trouble,has anyone can help me?

error detail:
Linking...
ListTest.obj : error LNK2019: unresolved external symbol "public: __thiscall
com::LinearList<int>::LinearList<int>(int)" (??0?$LinearList@H@com@@QAE@H@Z)
referenced in function _main
D:\Project\CPPTest\Debug\CPPTest.exe : fatal error LNK1120: 1 unresolved
externals

<ListTest.cpp>
-------------------------------------------------------------------------------------------
#include <stdafx.h>
#include "List.h"
#include <iostream>

using namespace std;
using namespace com;

void main()
{
try
{
 LinearList<int> L(10);
 //cout << "Length = " << L.Length()  << endl;
 //cout << "IsEmpty = " << L.IsEmpty() <<endl;
 ////L.Insert( 0 , 2 ).Insert( 1 ,6 ) ;
 ////cout << "List is " << L << endl;
 //cout << "IsEmpty =  " << L.IsEmpty()  << endl;
 //int z = 0;
 ////L.Find( 1 , z ) ;
 //cout << "First element is " << z  << endl;
 //cout << "Length =  " << L.Length()  << endl;
 ////L.Delete( 1 , z ) ;
 //cout << "Deleted element is " << z  << endl;
 ////cout << "List is " << L << endl;

}
catch (...)
{
 cerr << "An exception has occurred" << endl;
}
}

<List.h>
-------------------------------------------------------------------------------------------
#include "stdafx.h"
#include <iostream>
using namespace std;

namespace com {
// ÄÚ´æ²»×ã
class NoMem {
public:
 NoMem () {}
};

template<class T> class LinearList {
public:
 //¹¹Ô캯Êý
 LinearList(int MaxListSize);
 //Îö¹¹º¯Êý
 ~LinearList()  {delete [] element;}
 bool IsEmpty() const {return length == 0;}
 int Length() const {return length;}
 //·µ»ØµÚk¸öÔªËØÖÁxÖÐ
 bool Find(int k, T& x) const;
 // ·µ»ØxËùÔÚλÖÃ
 int Search(const T& x) const;
 // ɾ³ýµÚk¸öÔªËز¢½«Ëü·µ»ØÖÁxÖÐ
 LinearList<T>& Delete(int k, T& x);
 // ÔÚµÚk¸öÔªËØÖ®ºó²åÈëx
 LinearList<T>& Insert(int k, const T& x);
 void Output(ostream& out) const;
private:
 int length;
 int MaxSize;
 // һά¶¯Ì¬Êý×é
 T *element;
} ;

};

<List.cpp>
-----------------------------------------------------------------------------
#include <stdafx.h>
#include "List.h"
#include <iostream>
using namespace std;

namespace com {

// ʹn e wÒý·¢N o M e mÒì³£¶ø²»ÊÇx a l l o cÒì³£
void my_new_handler()
{
 throw NoMem();
}

//set new handler for new operation
new_handler Old_Handler_=set_new_handler(my_new_handler);

template<class T> LinearList<T>::LinearList(int MaxListSize)
{
 // »ùÓÚ¹«Ê½µÄÏßÐÔ±íµÄ¹¹Ô캯Êý
 MaxSize = MaxListSize;
 element = new T[MaxSize];
 length = 0;
}
 ......
}