date comparision

Question

hi i have 2 text boxes start date and end date. i want to fetch records between dates. but the problem is my data base stores the dates in varchar format hence i am unable to match the condition

please help me i am new to sql server

textboxes gets values in date format from calender control

please reply the query??????

Q)table structure

stud_id,name,start _date(varchar),end_Date(varchar)