In SfDataGrid, you can able to select multiple rows using SelectionMode property. You can process the CheckBoxSelection using GridCheckBoxColumn and a Boolean property called IsSelected in Model. You can also select all the rows in SfDataGrid by defining the CheckBox in header cell of GridCheckBoxColumn using GridColumn.HeaderTemplate.
You have to use IsSelectAll property in ViewModel to update the SelectAll check box value when performing selection in SfDataGrid. By using Command, you can select all the rows in SfDataGrid when the SelectAll CheckBox is checked and also you can clear the selection for all the rows in SfDataGrid when the CheckBox is unchecked.
You have to override ProcessPointerReleased and ProcessKeyDown methods in GridSelectionController to update the IsSelected value of the particular row while selecting or deselecting.
The following screen shot demonstrate the CheckBoxSelection in SfDataGrid.
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