How to Concatenate or Append TCHAR Strings

#include<windows.h>
#include<vector>
#include<map>
#include<list>
#include<conio.h>
#include<tchar.h>
using namespace std;

void main(void)
 {

TCHAR* String1;

TCHAR* String2;

TCHAR* String3;

TCHAR* Mystring;

String1="Hi  ";
String2="Welcome  ";
String3="to Know My C++ Blog";

_stprintf(Mystring,_T("%s%s%s"),String1,String2,String3);

_tprintf("\n\n Mystring:%s",Mystring);

getch( );
}

Output:
Mystring:Hi Welcome to Know My C++ Blog