建立windows应用程序，拖入两个textBox。

加入代码如下：

private: System::Void Form1_Load(System::Object * sender, System::EventArgs * e)
{
textBox1->MaxLength=8;
textBox1->PasswordChar='*';
textBox1->CharacterCasing=CharacterCasing::Upper;
textBox1->TextAlign=HorizontalAlignment::Center;
}


private: System::Void textBox1_TextChanged(System::Object * sender, System::EventArgs * e)
{
textBox2->Text=textBox1->Text;
}

就这样。