# Vector3D.XVector3D.XVector3D.XVector3D.X Property

## Definition

Gets or sets the X component of this Vector3D structure.

``````public:
property double X { double get(); void set(double value); };``````
``public double X { get; set; }``
``member this.X : double with get, set``
``Public Property X As Double``

#### Property Value

The X component of this Vector3D structure. The default value is `0`.

## Examples

The following example shows how to calculate the dot product of two Vector3D structures. It also shows how to assign values to a Vector3D structure when the structure is being declared and after the structure has been declared.

``````// Calculates the Dot Product of two Vectors.

// Declaring vector1 and initializing x,y,z values
Vector3D vector1 = new Vector3D(20, 30, 40);

// Declaring vector2 without initializing x,y,z values
Vector3D vector2 = new Vector3D();

// A Double to hold the result of the operation
Double dotProduct;

// Assigning values to vector2
vector2.X = 45;
vector2.Y = 70;
vector2.Z = 80;

// Calculating the dot product of vector1 and vector2
dotProduct = Vector3D.DotProduct(vector1, vector2);

// vectorResult is equal to (6200)
``````
``````' Calculates the Dot Product of two Vectors.

' Declaring vector1 and initializing x,y,z values
Dim vector1 As New Vector3D(20, 30, 40)

' Declaring vector2 without initializing x,y,z values
Dim vector2 As New Vector3D()

' A Double to hold the result of the operation
Dim dotProduct As Double

' Assigning values to vector2
vector2.X = 45
vector2.Y = 70
vector2.Z = 80

' Calculating the dot product of vector1 and vector2
dotProduct = Vector3D.DotProduct(vector1, vector2)

' vectorResult is equal to (6200)
``````