How to add a reference to System.Numerics.dll

Question

I want to use the BigInteger class from the System.Numerics but if i want to write

using System.Numerics; 

Numerics is not found. I searched the web, and I found that I have to add a reference to System.Numerics.dll, but how can I do that?

Answer 1

http://msdn.microsoft.com/en-us/library/7314433t(v=vs.80).aspx

From MSDN:

1. In Solution Explorer, select the project.
2. On the Project menu, choose Add Reference.
3. The Add Reference dialog box opens.
4. Select the tab indicating the type of component you want to reference.
5. In the top pane, select the component you want to reference, and then click the Select button. Press CTRL while clicking to select multiple components.