Check Box Problem In Data Grid?

Here is another problem i have a check box in datagrid i am using this check box to update user status i.e is he disable or enabled my problem is this

1. When i check the check box is saves True value in User_st column where as i want when i check the check box it should save False in user_st column.

2. When the datagrid form loads it fetches the records from my users table here i can enable or disable users but thoses users who are already disalbed, for then the checkbox should be chedked and for enabled users checkbox should be unchked how to achieve this????

Here is the code i am using om my update button

[Code]...