Specifies how data source contents are sorted by default, when sort order is not specified by the bound control.
A String object which contains the names of the columns against which data source contents are sorted.
This property accepts a string containing a column name followed by the sort order - "ASC" (ascending) or "DESC" (descending).
Columns are sorted ascending by default - "ASC" can be omitted.
Multiple columns can be separated by semicolons.
Assign the DefaultSorting property before binding the XPInstantFeedbackSource to the GridControl or SearchLookUpEdit. Once bound, changing this property throws an exception.