Data Verification Problem

hi

there is a problem when i insert data into tables in data base from textbox, spaces are added to the string so when i write the same data again in another textbox to retrive the data from the table there is a conflict happened

any one can help me to solve this problem

more explaination:

i use 2 textboxes to register a user as member in web site one is user name and the other is password and save the inserted data in my database

but when i make login in the same registerd username and password a conflict happened because the both user name and password in data base stored with spaces after there's string in database.