I want to return the date a week ago from today

I am using System.DateTime.Now.ToShortDateString() to get today's date.

I want to return this date minus 7 days(a week ago) so I can use it as a parameter in a SQL query.

I know that System.DateTime.Now has a Subtract method, but I dont think it will suit my purposes.

thanks in advance

 

select cast(DATEDIFF(dd, 7, GetDate())as datetime)

 

pls let me knw hw to substrct 7 days from today...

 

I got this working

DateTime today = DateTime.Today;
DateTime back = today.Subtract(TimeSpan.FromDays(7));