Create mail box exchange 2007 + ASP.net

Hi,
http://www.c-sharpcorner.com/Blogs/4021/create-user-in-active-directory-and-maill-box-in-exchange-se.aspx

I have a problem with the creation of mailbox on the line
System.Management.Automation.PSSnapInInfo snampInfo = runspaceConfig.AddPSSnapIn ("Microsoft.Exchange.Management.PowerShell.Admin" out snapEX);
an error is returned Microsoft.Exchange.Management.PowerShell.Admin it is not installed this machine "
I don't have this problem in console project just in project asp.net.

Thank you for Help.

Lionel