A column's drop-down filter allows you to filter data at runtime. The drop-down filter displays a column's unique values.
To filter data against a column, an end user should click the filter button in a column header and select any item(s):
An end user can invoke a column's drop-down filter if the view's DataViewBase.AllowColumnFiltering property is set to true. Grid columns provide the ColumnBase.AllowColumnFiltering option that enables you to override a View's default behavior. For example, you can set a column's ColumnBase.AllowColumnFiltering property to DefaultBoolean.False and prevent an end user from filtering data by its values.
Drop-down Filter Modes
The drop-down filter can work in different modes. Use the ColumnBase.FilterPopupMode property to change the drop-down filter's mode.