static method problem

Question

suppose i create a class

 

like 

namespace x

{

class a

{

public SqlConnection getcon()

{

................some code

}

}

}

 

and i want to use it another application

i just add reference of that class 

using  x;

class b:a

 

{

public void xyz()

{

 and i just use the  getcon() method

}

but when i create static method like

static xys()

{

  here we want to create the obj of  "a" class then i use it why?

like  a obj = new a();

obj.getcon(); {why?}

 

}

}