Complex.Multiply Operator (Complex, Complex)
Note 

The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience. 
Multiplies two specified complex numbers.
Assembly: System.Numerics (in System.Numerics.dll)
Parameters
 left

Type:
System.Numerics.Complex
The first value to multiply.
 right

Type:
System.Numerics.Complex
The second value to multiply.
The Multiply method defines the operation of the multiplication operator for complex numbers. It enables code such as the following:
The multiplication of a complex number, a + bi, and a second complex number, c + di, takes the following form:
(ac  bd) + (ad + bc)i
If the multiplication results in an overflow in either the real or imaginary component, the value of that component is either Double.PositiveInfinity or Double.NegativeInfinity.
Languages that do not support custom operators can call the Multiply method instead.
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone
Available since 8.1