引用名稱空間
using System.Text;
//allows you to access classes within this namespace such as StringBuilder
//without prefixing them with the namespace. i.e:
//...
var sb = new StringBuilder();
//instead of
var sb = new System.Text.StringBuilder();
using System.Text;
//allows you to access classes within this namespace such as StringBuilder
//without prefixing them with the namespace. i.e:
//...
var sb = new StringBuilder();
//instead of
var sb = new System.Text.StringBuilder();