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# Vector.Multiply Method (Vector, Vector)

.NET Framework 4.5

Calculates the dot product of the two specified vectors and returns the result as a Double.

Namespace:  System.Windows
Assembly:  WindowsBase (in WindowsBase.dll)
```public static double Multiply(
Vector vector1,
Vector vector2
)
```

#### Parameters

vector1
Type: System.Windows.Vector

The first vector to multiply.

vector2
Type: System.Windows.Vector

The second vector structure to multiply.

#### Return Value

Type: System.Double
A Double containing the scalar dot product of vector1 and vector2, which is calculated using the following formula:
(vector1.X * vector2.X) + (vector1.Y * vector2.Y)

The following example shows how to use this method to multiply a Vector by a Vector.

```private Double getDotProductExample()
{
Vector vector1 = new Vector(20, 30);
Vector vector2 = new Vector(45, 70);
Double doubleResult;

// Return the dot product of the two specified vectors.
// The dot product is calculated using the following
// formula: (vector1.X * vector2.X) + (vector1.Y * vector2.Y).
// doubleResult is equal to 3000
doubleResult = Vector.Multiply(vector1, vector2);

return doubleResult;

}
```

#### .NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0

#### .NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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