1-  you can do it this way:

//if starting from a DataTable reference.
myDataGridControl.ItemsSource = new DataGridCollectionView( myDataTable.DefaultView );

//directly from a DataView
myDataGridControl.ItemsSource = new DataGridCollectionView( myDataView );

2- You can specify to the DataGridControl NOT to create its columns automatically based on the Data Source. This can be done by specifying myDataGridControl.AutoCreateColumns = false;

From there, you can add columns manually to the DataGridControl.Columns collection.