Resolved: What is the equivalent DateAndTime.DateAdd in C#

Question:

I have an old code written in VB.Net and I am trying to convert it into c#. I am stuck on DateAndTime.DateAdd conversion for c#

DateAdd(DateInterval.Month, -1, Now).ToString("MMM")

This is my old vb.net code. It is getting the current month and subtracting – one month from it.
How do I achieve this c#?

Use DateTime.AddMonths.
Pay attention:

Returns a new DateTime

var date = DateTime.Now.AddMonths(-1);
var stringDate = date.ToString("MMM");

If you have better answer, please add a comment about this, thank you!