No, you are wrong, Reference types are passed by Value by default, surprised?
Explanation:
Pass-By-Value
Test(object R2)
{
R2=null;
}
//you call
object R1 = new object();
Test(R1);
WriteLine(R1==null) //result false.
Reference type R1 is created on address y100 and its value is some another address called x100; // as we know refrence type refer to an address
now in method
Reference type R2 is created on a memory address y200,
and it is copied value of R1 ie. x100;
so when you reset R2=null. only value of the r2 set to null. means now its not pointing to address x100. but R1 still pointing to address x100.
NOTE: if value at address x100 is changed, both R2 and R1 will show that, because both pointing to the same address.
Pass-By-Reference ->
Test(ref object R2)
{
R2=null;
}
object R1 = new Object();
Test(ref R1);
WriteLine(R1==null) //result true.
now we are passing variable by Reference. now here address of R1 is passed i.e y100. so R1 & R2 both are pointing to y100. so if you change R2's value, R1's will also changed
Any issue please comment.
Showing posts with label Interview-questions. Show all posts
Showing posts with label Interview-questions. Show all posts
July 30, 2009
September 01, 2008
clustered vs non-clustered Index sql server
Question: difference between clustered and non-clustered Indexing,
following are some compiled differences list. May be useful for you.
if useful & more info to add please comment if anything wrong please criticize
1. Only one clustered and 249 nonclustered indexes.
2. Clustered index can be on primary key and other.
3. If you don’t want to create clustered index on primary specify it.
4. SQL Server determines whether to use an index by examining only the first column defined in the index. For example, if you defined an index on FirstName, LastName and a query is looking for LastName, this index would not be used to satisfy the query.
following are some compiled differences list. May be useful for you.
if useful & more info to add please comment if anything wrong please criticize
1. Only one clustered and 249 nonclustered indexes.
2. Clustered index can be on primary key and other.
3. If you don’t want to create clustered index on primary specify it.
4. SQL Server determines whether to use an index by examining only the first column defined in the index. For example, if you defined an index on FirstName, LastName and a query is looking for LastName, this index would not be used to satisfy the query.
January 16, 2008
clustered vs non-clustered Index sql server
Question: difference between clustered and non-clustered Indexing,
following are some compiled differences list. May be useful for you.
if useful & more info to add please comment if anything wrong please criticize
1. Only one clustered and 249 nonclustered indexes.
2. Clustered index can be on primary key and other.
3. If you don’t want to create clustered index on primary specify it.
4. SQL Server determines whether to use an index by examining only the first column defined in the index. For example, if you defined an index on FirstName, LastName and a query is looking for LastName, this index would not be used to satisfy the query.
following are some compiled differences list. May be useful for you.
if useful & more info to add please comment if anything wrong please criticize
1. Only one clustered and 249 nonclustered indexes.
2. Clustered index can be on primary key and other.
3. If you don’t want to create clustered index on primary specify it.
4. SQL Server determines whether to use an index by examining only the first column defined in the index. For example, if you defined an index on FirstName, LastName and a query is looking for LastName, this index would not be used to satisfy the query.