Need help regarding C# and Access 2007

Question

hii,
i need help regarding displaying data in datagrid. i am using C# and Access 2007.So here is the problem.
1. i have two table. details and main
2. details table data are stored in the text box and main table details are stored in datagrid
3. i have three buttons:add, save, cancel
4. whenever i press add button, all the fields in the form should be enabled and blank including datagrid. but the datagrid populates the previous stored data. i dont want that. i simple want the datagrid enabled and prepare to store the data when i click the save button. please help