几个关于控件的优先级：UseSystemPasswordChar>PasswordChar>控件属性设置

 1 using System; 2 using System.Data; 3 using System.Drawing; 4 using System.Text; 5 using System.Windows.Forms; 6 namespace Test05 7 { 8     public partial class Form1 : Form 9     {10         public Form1()11         {12             InitializeComponent();13         }14         PRivate void Form1_Load(object sender, EventArgs e)15         {16             textBox1.PassWordChar = '*';17             textBox2.UseSystemPasswordChar = true;18         }19     }20 }