Send mail on the basis of two dates

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C#

Hello I have to send

there are two textbox
1->From date
2->To date
some dropdown list
and at last one grid

on the basis of to and from date I have to send mail
1> if both the date are current date than I have to send dailymail.
2>If the date diffrence is 7 days means it can be 24 july to 31 july than in this case I have to send weeklymail.
3>similarly for month.
Description-:
sendMailDaily( --; create Excel with the corret data as per the current date and then write mailSend() to send mail . xls will go in attachment
sendMailWeekly()
sendMailMonthly()

Now Please reply me as soon as possible.