窗体之间传值最简单的方法---利用tag属性
form1
string s = "hello";
form2 f2= new form();
f2.tag = s;
f2.show();
form2
string s = this.tag.toString();
form1
string s = "hello";
form2 f2= new form();
f2.tag = s;
f2.show();
form2
string s = this.tag.toString();