Returns a hash code for the specified object.
public int GetHashCode (T obj);
The Object for which a hash code is to be returned.
A hash code for the specified object.
The type of
obj is a reference type and
Implement this method to provide a customized hash code for type
T,corresponding to the customized equality comparison provided by the Equals method.
Notes to Implementers
Implementations are required to ensure that if the Equals(T, T) method returns `true` for two objects
y, then the value returned by the GetHashCode(T) method for
x must equal the value returned for