How to update column in a gridview after saving data through text box?

Question

I have one grid view with 4 columns(UserId,Description,Password,Change Password). when i click on change password the panel with 3 textboxes(UserID,New Password,Confirm Password) and save button appears. after changing password the panel disappears but the password in the gridview remains same as previous. i want to update the password column.
The code is in C# and back end is MySQL DB Server.. please help..