Struct usage C# with Example

With constructor: 
Vector v1 = new Vector(); 
v1.X = 1; 
v1.Y = 2; 
v1.Z = 3; 
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z); 
// Output X=1,Y=2,Z=3 
Vector v1 = new Vector(); 
//v1.X is not assigned 
v1.Y = 2; 
v1.Z = 3; 
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z); 
// Output X=0,Y=2,Z=3 
Point point1 = new Point(); 
point1.x = 0.5; 
point1.y = 0.6; 
Point point2 = new Point(0.5, 0.6); 
Without constructor: 
Vector v1; 
v1.Y = 2; 
v1.Z = 3; 
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z); 
//Output ERROR "Use of possibly unassigned field 'X' 
Vector v1; 
v1.X = 1; 
v1.Y = 2; 
v1.Z = 3; 
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z); 
// Output X=1,Y=2,Z=3 
Point point3; 
point3.x = 0.5; 
point3.y = 0.6; 
If we use a struct with its constructor, we aren't going to have problems with unassigned field (each unassigned 
field has null value). 
 

Unlike classes, a struct doesn't have to be constructed, i.e. there is no need to use the new keyword, unless you 
need to call one of the constructors. A struct does not require the new keyword because is a value-type and thus 
cannot be null.