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public static LocalResource uploadFolder = RoleEnvironment.GetLocalResource("FilesUploaded");

These lines of code are run in every case If the business object is to be retrieved, then it is returned as a result, but if the row count was requested, then the following code is used to get the number of items in the business object and return that number as a result, rather than the business object itself: if (argumentsRetrieveTotalRowCount) { if (obj == null) result = 0; else if (obj is IList) result = ((IList)obj)Count; else if (obj is IEnumerable) { IEnumerable temp = (IEnumerable)obj; int count = 0; foreach (object item in temp) count++; result = count; } else result = 1; } If the business object reference is null, there are zero rows of data.

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The hiding of the data and the implementation code behind the interface are keys to the successful creation of a business object If the users of an object are allowed to see inside it, they will be tempted to cheat and to interact with the logic or data in unpredictable ways This danger is the reason why it is important to take care when using the public keyword as you build your classes Any property, method, event, or field marked as public is available to the users of objects created from the class For example, you might create a simple class such as the following: public class Project { private Guid _id = GuidNewGuid(); public Guid Id { get { return _id; } } private string _name = stringEmpty; public string Name { get { return _name; } set { if (value == null) value = string.

After you have this reference to the local folder, you can start using it like a normal directory. To get the physical path, so you can check the directory contents or write files to it, you would use the uploadFolder reference from the preceding code.

If the object implements the IList interface, the count is simply retrieved from the object; while if it only implements IEnumerable, the code loops through all items in the list and counts them Otherwise, the business object is not a collection at all, so obviously the result is 1 Regardless of whether the method is returning the business object or the row count, Web Forms data binding requires that the data source be IEnumerable the most basic interface for a collection or list in NET The challenge is that many business objects are simple objects, like Customer or Invoice; and of course, the row count is a simple int value These values don t implement IEnumerable, and so can t be directly returned as a result.

string rootPathName = uploadFolder.RootPath;

Empty; if(valueLength > 50) throw new Exception("Name too long"); _name = value; } } } This defines a business object that represents a project of some sort All that is known at the moment is that these projects have an ID value and a name Notice, though, that the fields containing this data are private you don t want the users of your object to be able to alter or access them directly If they were public, the values could be changed without the object s knowledge or permission (The _name field could be given a value that s longer than the maximum of 50 characters, for example) The properties, on the other hand, are public They provide a controlled access point to the object The Id property is read-only, so the users of the object can t change it.

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