.net and C#

my data base in one table field value is *30  so it value store in varchar(50) data type so how to convert this value int or flot.tell me..pls

and i store *30 value varchar() datatype .because this type of value not store in other data type..

and finally *30 value get throgh data base in my form i need *30 is one type value ..because *30 with one other value multiply..ok