Template linear list error, link errors

#include "stdafx.h"
#include "Seque.h"

int main(int argc, char* argv[])
{
	printf("Hello World!\n");
	int n,number,position1,insert1,position2;
	Seque<int> seque;
	cout<<"Input the number of numbers you want to enter!"<<endl;
	cin>>n;
	seque.Input(n);
	seque.Output();
	cout<<"Input the number you want to search!"<<endl;
	cin>>number;
	seque.SearchItem(number);
	cout<<"Input the position and number you want to insert!"<<endl;
	cin>>position1;
	cin>>insert1;
	seque.InsertItem(position1,insert1);
	seque.Output();
	cout<<"Input the position you want to delete!"<<endl;
	cin>>position2;
	seque.DeleteItem(position2);
	seque.Output();
	
	return 0;
}

<pre lang="xml">#include "stdafx.h"
#include "Seque.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
template<class T>
Seque<T>::Seque(int sz)
{
    listsize=sz;
    lenth=-1;
    elem= new T[listsize];
    if (elem==NULL)
    {
        cerr<<"error"<<endl;
        exit(1);
    }
}
template<class T>
void Seque<T>::SearchItem(T& x)
{
    for (int i=0;i<listsize;i++)
    {
        if (elem[i]==x)
        {
            cout<<"The number you search is at "<<i<<"th location"<<endl;
        }
        else
            cout<<"Not Found!"<<endl;
    }
}
template<class T>
void Seque<T>::InsertItem(int i, T& x)
{
    if (lenth==listsize-1)
    {
        cout<<"full"<<endl;
    }
    for (int j=lenth;j>i;j--)
    {
        elem[j+1]=elem[j];
    }
    elem[i]=x;
    lenth++;
}
template<class T>
void Seque<T>::DeleteItem(int i)
{
    int x;
    if (i>lenth)
    {
        cout<<"Exceed!"<<endl;
    }
    x=elem[i];
    for (int j=i;j<=lenth;j++)
    {
        elem[j]=elem[j+1];
    }
    lenth--;
    cout<<"The number at where you point is "<<x<<endl;
}
template<class T>
void Seque<T>::Input(int i)
{
    if (i>listsize)
    {
        cout<<"Error!"<<endl;
        break;
    }
    lenth=i;
    cout<<"Input the elements!"<<endl;
    for (int j=0;j<i;j++)
    {
        cout<<"Number"<<j+1<<endl;
        cin>>elem[j];
    }
}
template<class T>
void Seque<T>::Output()
{
    for (int i=0;i<lenth;i++)
    {
        cout<<"Number "<<i+1<<":"<<endl;
        cout<<elem[i]<<endl;
    }
}

<pre lang="xml">#if !defined(AFX_SEQUE_H__78600571_2F0D_49E2_B387_EA39796A31A6__INCLUDED_)
#define AFX_SEQUE_H__78600571_2F0D_49E2_B387_EA39796A31A6__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <iostream.h>
#include <stdlib.h>
#define Defaultsize 100
template <class T>
class Seque
{
private:
    T *elem;
    int lenth;
    int listsize;
protected:
public:
    Seque(int sz=Defaultsize);
    ~Seque(){delete[] elem;}
    void InsertItem(int i, T& x);
    void DeleteItem(int i);
    void SearchItem(T& x);
    void Input(int i);
    void Output();

};
#endif // !defined(AFX_SEQUE_H__78600571_2F0D_49E2_B387_EA39796A31A6__INCLUDED_)

Linking...
3 Main.obj : error LNK2001: unresolved external symbol "public: void __thiscall Seque<int>::DeleteItem(int)" (?DeleteItem@?$Seque@H@@QAEXH@Z)
3 Main.obj : error LNK2001: unresolved external symbol "public: void __thiscall Seque<int>::InsertItem(int,int &)" (?InsertItem@?$Seque@H@@QAEXHAAH@Z)
3 Main.obj : error LNK2001: unresolved external symbol "public: void __thiscall Seque<int>::SearchItem(int &)" (?SearchItem@?$Seque@H@@QAEXAAH@Z)
3 Main.obj : error LNK2001: unresolved external symbol "public: void __thiscall Seque<int>::Output(void)" (?Output@?$Seque@H@@QAEXXZ)
3 Main.obj : error LNK2001: unresolved external symbol "public: void __thiscall Seque<int>::Input(int)" (?Input@?$Seque@H@@QAEXH@Z)
3 Main.obj : error LNK2001: unresolved external symbol "public: __thiscall Seque<int>::Seque<int>(int)" (??0?$Seque@H@@QAE@H@Z)
Debug/3 Main.exe : fatal error LNK1120: 6 unresolved externals
Error executing link.exe.