Logical operator overloading for C #

Not only C + +, but also in C # can be overloaded with operators. Such as:
Namespace Com.EVSoft.Math
{
public class Vector3:baseobject
{
...
......
..
public static Vector3 operator + (Vector3 lvector,double RHS);
public static Vector3 operator + (Vector3 Lvector,vector3 rvector);
public static BOOL operator = = (Vector3 Lvector,vector3 rvector);
...
......
}
}

The above code is a vector class that overloads operators and operators, overloading the operator or operator means changing the original meaning of the operator. For example
...
......
..
Vector3 vec=null;//assignment operator, whether it is the original meaning needs the developer to see its definition
if (vec==null)//logical operator, according to Vector3 's overloaded definition, here must be an error
{
Vec=new VECOTR3 ();
}

Logical operator overloading for C #