Nullable Data Type
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
Example 2:
float? a = 436;
float? b = null;
if (a.HasValue) Response.Write("testing");
if (b.HasValue) Response.Write("testi"); else Response.Write("test");
Output:
testingtest
