protected override void CacheMetadata(ActivityMetadata metadata)
{
metadata.AddImportedChild(this.Left);
metadata.AddImportedChild(this.Right);
if (this.Left == null)
{
metadata.AddValidationError(System.Activities.SR.BinaryExpressionActivityRequiresArgument("Left", "OrElse", base.DisplayName));
}
if (this.Right == null)
{
metadata.AddValidationError(System.Activities.SR.BinaryExpressionActivityRequiresArgument("Right", "OrElse", base.DisplayName));
}
}