Question

source
http://technet.microsoft.com/en-us/library/ms162234%28SQL.100%29.aspx

code

//Connect to the local, default instance of SQL Server. 

  { 

     Server srv = default(Server);
     srv = new Server(); 
     //Create a linked server. 
     LinkedServer lsrv = default(LinkedServer); 
     lsrv = new LinkedServer(srv, "OLEDBSRV"); 
     //When the product name is SQL Server the remaining properties are 
     //not required to be set. 
     lsrv.ProductName = "SQL Server"; 
     lsrv.Create(); 

  } 

why to use default(Server),?
-even if its like server asd = new asd(); it will still connect to the default instance!

why to use default(linkedserver)
-whats the point? we still specify the srv and provider and product!

Answer 1

default(...) is the default value operator. It evaluates to null for reference types, or the “zero” value for value types.

There’s absolutely no point to it here… the variable is assigned a different value immediately. Here’s the equivalent, tidier code:

Server srv = new Server(); 
//Create a linked server. 
LinkedServer lsrv = new LinkedServer(srv, "OLEDBSRV"); 
//When the product name is SQL Server the remaining properties are 
//not required to be set. 
lsrv.ProductName = "SQL Server"; 
lsrv.Create();