C#各种问题解决

C#中窗体之间用构造函数传递变量，会出现如下错误

此时将

    public partial class AddStudents : Form    {        private Usart_Help usart_Help;        public AddStudents(Usart_Help usart_Help)        {            InitializeComponent();            this.usart_Help = usart_Help;        }        private void AddStudents_Load(object sender, EventArgs e)        {        }    }

中的public去掉即可

    partial class AddStudents : Form    {        private Usart_Help usart_Help;        public AddStudents(Usart_Help usart_Help)        {            InitializeComponent();            this.usart_Help = usart_Help;        }        private void AddStudents_Load(object sender, EventArgs e)        {        }    }