有form1和form2两个窗口，form1有一个按钮，里面有一个string str="V1001",点击一下按钮，在form2的TextBox中显示出str的值。
public partial class Form1 : Form
    {
        public str;
        publicForm1()
        {
            InitializeComponent();
        }
 
        privatevoid button1_Click(objectsender, EventArgs e)
        {
            Form2 form2=new Form2();
            str="V1001";
            form2.Show();
        }
    }

  public partial class Form2 : Form  
       {      
            form1 fm=new form1();
            publicForm2()      
                 {            
                        InitializeComponent();      
                 }      
           privatevoid Form2_Load(objectsender, EventArgs e)      
                  {           
                          this.TextBox1.Text=fm.str;      
                   }


       }

原来如此，问题解决了，谢了