A grid filter expression is specified via the FilterString or GridControl.FilterExpression property. This expression can consist of multiple conditions applied to multiple columns.
To get a string that specifies a filter currently used in the grid, use the GridControl.ActualFilterString property.
By default, this string is shown in the filter panel that is automatically displayed at the bottom of the grid after a filter has been created. This panel provides buttons allowing end-users to disable/enable and clear the filter. To control the visibility of the filter panel, use the GridControl.FilterPanelVisibility property.