The ASPxGridView allows you to sort data displayed within an unlimited number of columns.
The column's current sort order is indicated by a sort glyph displayed at the column header's right edge.
If the column isn't sorted, the sort glyph is hidden.
Click the column's header to sort data against a data column or change the column's sort order. To sort data against multiple columns,
click column headers with the SHIFT key pressed down.
Set the AllowSort option to true to enable end-user sorting.