RE: Which Variable type is best to choosen for accepti...
Nullable types are meant only to be used for ADO.net. That means if you are expecting an integer (like zip code) from a query and query returns no rows the data type used must be nullable type...
Nullable data type means which accpets NULL values apart from accpeting permitted values.. for eg. a bool datatype will take yes no and also NULL if its declared as nullable...
RE: Which Variable type is best to choosen for accepting Null Values?
In .NET 1.1 you can use the type "object" to store the values. You then have the choice of setting the object reference to "null" or storing the value. The issue here is that the object could contain any type of information and you would need to cast. An Exception may result if the wrong type of object has been stored. If you are in control of the object at all times this shouldn't be a problem. But it may cause issues if you interface the object into code written by other people or companies where you have no control over what is done to your object.
Another option is to create your own Nullable type. E.g. NullableInt with methods to get/set the integer value and methods to determine if the value is null.
In .NET 2.0 you can use the Nullable Types feature to quickly make a nullable type of any type you desire. This will provide get / set methods and properties to determine if the value is null.
So whats the best? I'd say .NET 2.0 Nullable Types.
