what is string collection?

The process of transitively tracing through all pointers to actively used objects in order to locate all objects that can be referenced, and then arranging to reuse any heap memory that was not found during this trace. The common language runtime garbage collector also compacts the memory that is in use to reduce the working space needed for the heap. (More...)

Class instances often encapsulate control over resources that are not managed by the runtime, such as window handles (HWND), database connections, and so on. Therefore, you should provide both an explicit and an implicit way to free those resources. Provide implicit control by implementing the protected Finalize Method on an object (destructor syntax in C# and the Managed Extensions for C++). The garbage collector calls this method at some point after there are no longer any valid references to the object.
In some cases, you might want to provide programmers using an object with the ability to explicitly release these external resources before the garbage collector frees the object. If an external resource is scarce or expensive, better performance can be achieved if the programmer explicitly releases resources when they are no longer being used. To provide explicit control, implement the Dispose method provided by the IDisposable Interface. The consumer of the object should call this method when it is done using the object. Dispose can be called even if other references to the object are alive.


Note that even when you provide explicit control by way of Dispose, you should provide implicit cleanup using the Finalize method. Finalize provides a backup to prevent resources from permanently leaking if the programmer fails to call Dispose. (More...)

The answer is TWO of the above questions (More...)

@string. With adding @ at the beginning you can escape literal (More...)

String is an Object Type. where other data types are reference type in .NET (More...)

Database connection string can be stored in the web config file.
The connection string can be stored in the WEB.Config file under
element. (More...)

Queue, Stack, BitArray, HashTable, LinkedList, ArrayList, Name ValueCollection, Array, SortedList, HybridDictionary, ListDictionary, StringCollection, StringDictionary (More...)

The connection string consists of the following parts:
In general:

Server: Whether local or remote.

Uid: User Id (sa-in sql server)

Password: The required password to be filled-in here

Database: The database name. (More...)

The .NET Framework provides specialized classes for data storage
and retrieval.
These classes provide support for stacks, queues, lists, and hash tables. (More...)

The main difference is lies on memory management.

String.Empty will not create any object of string where as "" (Double Quote or Empty Quote) will create a new object in the memory for the checking the objects. (More...)