- Button added: after filling enough of the class need more information or need more subjects, click to "Add" that information into a database.
- Delete Button: After selecting the class or subject to delete and press any buttons "delete", that information will be deleted from the database.
- button edit: after selecting subjects and conduct classes or edit and click "edit", the information will be edited in a database update data. 5. Listed interface layer When clicking the menu Make a list of classes, interfaces appear include buttons Add and Remove from grade class, along with two regional list: - The left side is a list of students to be classified layer (the current has not been added to any grade) with information including the student code, name and box selected. - the right side is a list of students who have been added to an additional layer of information: school code birth, name, class name, and the cell pointer. - Schools need to enter information including: volume and grade
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