Get Data For Previous Month In Table Based On Current Date

I need to get previous month data in the table based on current date.

In case of execution of each month, the data for previous month should come with date as between

create table TestDate
(Sno Int,
Name varchar(100),
DateofJoin datetime)

insert into TestDate values (1,'Raj', '2/21/2014')
insert into TestDate values (1,'Britto', '6/12/2014')
insert into TestDate values (1,'Kumar', '5/14/2014')
insert into TestDate values (1,'Selva', '6/27/2014')
insert into TestDate values (1,'Ravi', '5/2/2014')
insert into TestDate values (1,'Gopu', '6/2/2014')
/*

if I execute in month July ( ie: today)

select * from TestDate where dateofjoin between 1-june-2014 and 30-june-2014

Result

5 Ravi 2014-05-02 00:00:00.000
3 Kumar 2014-05-14 00:00:00.000

if I execute in month June

select * from TestDate where dateofjoin between 1-may-2014 and 30-may-2014

Result

6Gopu2014-06-02 00:00:00.000
2Britto2014-06-12 00:00:00.000
4Selva2014-06-27 00:00:00.000
/*