What is the difference Between String and string? [duplicate]

Question

Possible Duplicate:
String vs string in C#

What is the difference Between String and string or Double and double?

if i use :

double s1; or

if i use Double s1;

can you give pros and cons?

Answer 1

string is just the C# alias for the System.String class. The same is true for all the other built-in language types like:

• int (System.Int32)
• float (System.Single)
• double (System.Double)
• decimal (System.Decimal)
• bool (System.Boolean)
• and so on...

As far as usage conventions go, I completely agree with this answer on SO.

Related resources:

• C# Built-in Types Table