C# -- String.Format ( format to hex )

int x = 10; // hex == 0xA
string s = ""
s = String.Format("{0:X2}",x);
MessageBox.show(s);
== result ==
1 ==> 01
A ==> 0A
B ==> 0B

=====
int x = 10;
string s = x.ToString("X2");
結果也是一樣... 0A