How to validate all the cell values in WPF DataGrid (SfDataGrid) in button click?

<syncfusion:SfDataGrid x:Name="sfDataGrid" 
                               AllowEditing="True"
                               SelectionMode="Single"
                               NavigationMode="Cell"
                               ItemsSource="{Binding Orders}"
                               AutoGenerateColumns="False">
            <syncfusion:SfDataGrid.Columns>
                <syncfusion:GridTextColumn HeaderText="Order ID" MappingName="OrderID"/>
                <syncfusion:GridTextColumn HeaderText="Customer ID" MappingName="CustomerID" />
                <syncfusion:GridTextColumn HeaderText="Customer Name" MappingName="CustomerName" />
                <syncfusion:GridTextColumn HeaderText="Country" MappingName="Country" />
                <syncfusion:GridCurrencyColumn HeaderText="Unit Price" MappingName="UnitPrice"/>
            </syncfusion:SfDataGrid.Columns>
</syncfusion:SfDataGrid>
 
<StackPanel Grid.Column="1">
            <Button  Content="Validate Cell Value"  Width="100" Height="50"
                     Command="{Binding Path=DataContext.RowDataCommand,ElementName=sfDataGrid}" 
                     CommandParameter="{Binding ElementName=sfDataGrid}"/>
</StackPanel>

public void ChangeCanExecute(object obj)
{
            var datagrid = (obj as SfDataGrid);
            //Here customize condition based cell validation 
            foreach (var record in datagrid.View.Records)
            {
                if ((record.Data as OrderInfo).UnitPrice == 0)
                {
                    MessageBox.Show("Invalid value in OrderID: " + (record.Data as OrderInfo).OrderID);
 
                    Setter setter = new Setter();
                    setter.Property = GridCell.BackgroundProperty;
                    setter.Value = Brushes.Red;
                    var style = new Style(typeof(GridCell));
 
                    DataTrigger dataTrigger = new DataTrigger();
                    dataTrigger.Binding = new Binding("UnitPrice");
                    dataTrigger.Value = (double?)000;
                    dataTrigger.Setters.Add(setter);
 
                    style.Triggers.Add(dataTrigger);
                    datagrid.Columns["UnitPrice"].CellStyle = style;
                }
            }
}