Why string str = new string("abc") doesn't pass compiler?

Question

Given public String(char*) why we cannot use the following statement?

string str = new string("aaa");

Error 1

The best overloaded method match for 'string.String(char*)' has some invalid arguments C:\temp\ConsoleApplication2\ConsoleApplication2\Program.cs 19 26 ConsoleApplication2

Error 2

Argument 1: cannot convert from 'string' to 'char*' C:\temp\ConsoleApplication2\ConsoleApplication2\Program.cs 19 37 ConsoleApplication2

Answer 1

Simply use:

 string str = "aaa";

You do not need to new a string.

"aaa" is a string. It is not a char *.
char * is used with unsafe code.

Answer 2

Because this isn't meant to be used in safe code...

In C#, this constructor is defined only in the context of unsafe code.

from: http://msdn.microsoft.com/en-us/library/6y4za026.aspx

If you need to construct a string you could just use the literal decleration..

string str = "aaa";