using System.Web.ModelBinding;

I am using vs 2010, C#, asp.net 4.5.50709,   I am getting " Error 1 The type or namespace name 'ModelBinding' does not exist in the namespace 'System.Web' (are you missing an assembly reference?) C:\BooksWork\ProAspNet45inCsharp\Work\PartyInvites\PartyInvites\Default.aspx.cs 7 18 PartyInvites"  when adding this "using" statement. 
Is this not available in vs 2010 ?  Thanks