using DevExpress.ExpressApp.ConditionalAppearance;
//...
[Appearance("ActionState", AppearanceItemType = "Action",
    TargetItems = "Product.Deactivate",
        Criteria = "Status = 'Inactive'", Context = "Any", Enabled = false)]
public class Product : BaseObject {
    public virtual ProductStatus Status { get; set; }
    [Action(PredefinedCategory.RecordEdit, Caption = "Deactivate Product...", AutoCommit = true,
     TargetObjectsCriteria = "Status = 'Active'",
      SelectionDependencyType = MethodActionSelectionDependencyType.RequireSingleObject)]
    public void Deactivate() {
        Status = ProductStatus.Inactive;
    }
}

// Make sure that you use options.UseChangeTrackingProxies() in your DbContext settings.

using DevExpress.ExpressApp.ConditionalAppearance;
//...
public class Product : BaseObject {
    public virtual decimal Price { get; set; }
    public virtual ProductStatus Status { get; set; }
    [Appearance("RuleMethod", AppearanceItemType = "ViewItem", TargetItems = "*", Context = "ListView",
     BackColor = "Green", FontColor = "Black")]
    public bool RuleMethod() {
        if (Price < 10 && Status == ProductStatus.Active) {
            return true;
        }
        else {
            return false;
        }
    }
}

// Make sure that you use options.UseChangeTrackingProxies() in your DbContext settings.