If this option is set to true, it allows a user to select all rows at once by pressing Ctrl + A or clicking the check box in the selection column's header. The "Select All" check box also allows a user to deselect all rows. The select all functionality allows selecting/deselecting only those rows that meet filtering conditions if a filter is applied.
If this option is set to false, it disables the select all functionality. In this case, the check box clears selection and is hidden if no rows are selected.
The following selection modes are available in the widget:
Only one row can be in the selected state at a time.
Several rows can be in the selected state at a time.
SelectionMode enum to specify this option when the widget is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values: