[InterfaceExport(ContractName="", ContractType=IdeaBlade.EntityModel.IConcurrencyStrategy)]
public interface IConcurrencyStrategy 

// Sample IConcurrencyStrategy implementation.
public class ProduceConcurrencyValueSetter : IConcurrencyStrategy {

  // Return true if this strategy can be used with the data source.
  public bool IsApplicable(IdeaBlade.Core.IDataSourceKey dataSourceKey) {
    return dataSourceKey.Name.StartsWith("Produce");
  }

  // Called during SaveChanges processing when a new value is needed prior to insert/update.
  // In this example, we just increment a RowVersion property by 1. 
  public void SetNewConcurrencyValue(ConcurrencyProperty property, Entity entity) {
    ItemOfProduce item = entity as ItemOfProduce;
    int nextval = 0;
    
    if (item.RowState == EntityRowState.Modified) {
      nextval = item.RowVersion.HasValue ? item.RowVersion.Value + 1 : 1;
    }

    item.RowVersion = nextval;
  }
}