datagrid

Question

Hello, I have a xml-document and i place it in a datagrid with a dataset. One column is named "loadorder". When i load the xml-document into the datagrid, the column looks like this 1,3,2,6,5,8 and when i press the column (the header) he arranges them nicely 1,2,3,5,6,8. But when i save the dataset (dataset.WriteXml(filepath)) and load it again nothing has changed, it's back to 1,3,2,6,5,8. How can i save this? thx in advance