Nullable DataType in .Net 2.0

Posted Date: 10 Jun 2008 Resource Type: Definitions Category: General

Posted By: Balasubramaniyam Member Level: Gold
Rating:

Points: 2

Nullable Data Type

A data type is said to be "nullable" if they can be assigned the value "null". Nullable types are derived from the System.Nullable<T> class. Any nullable object accepts a range of values and also the "null" value.

If you dont have the value for nullable datatype, it will return automatically null as a value.

Example 1:


int? var1 = null;
int? var2 = 5;
var1 = var2;
if (var1.HasValue == true) //Using HasValue properties will will findout "var1" variable having value or null.
{
Response.Write("bala");
}
else
{
Response.Write("bala1");
}

Output:
bala

Let us look at another example:


float? a = 436;
float? b = null;
if (a.HasValue) Response.Write("testing");
if (b.HasValue) Response.Write("testi"); 
else Response.Write("test");

Output:
testingtest

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