C # operator overloading

The C # operator overload function must be public static

struct cstest
{
Publicint posx;
Public Static cstest operator + ( cstest O1, cstest O2)
{//two-tuple operator overloading
cstest OST = New cstest ();
OST.POSX = O1.posx + o2.posx;
return Ost
}
Public Static cstest operator - ( cstest Ot
{//Unary operator Overloading
Ot.posx =-OT.POSX;
returnOt
}
}

class Program
{
static void Main(string[] args)
{
cstest OSTN1 = New cstest ();
cstest OSTN2 = New cstest();
OSTN1.POSX = 1;
OSTN2.POSX = 2;
cstest Ostn3 = ostn1 + ostn2;
Ostn3 =-ostn3;
Console.WriteLine(OSTN3.POSX);
}
}

C # operator overloading