how to get value from datagrid to save xml file?

[maniravi]

Actually I have a jewels form which contains jewelname,price,carat and add button.when I click on Add button The data will be display in datagrid and The dataGrid Page contains Datagrid and one GenerateXML button and when I click on GenerateXML button the all data in DataGrid will display in xml file format.The DataGrid also have Delete and Edit option links.when I click on edit link the jewels page opens with update button instead of add button. can u plz help the code.