Pass Id from one form to other form

private void button1_Click(object sender, EventArgs e)
       {
           Display d = new Display(textBox1 .Text );
           d.Show();
       }

public partial class Display : Form
    {
        string str;// declare string to strore value

//constructor to load value
        public Display(string txt)
        {
            InitializeComponent();
            str = txt;
        }
//form load 
        private void Display_Load(object sender, EventArgs e)
        {
            label1.Text = str;
        }
    }

public static Int ID
        {
            get;
            set;
        }

var yourForm1=System.Windows.Forms.Application.OpenForms["Form1"] as Form1;
yourForm1.textBox1.Text="Text From another window";

string j="Himanshu";
Response.Redirect("BulkUpdate.aspx?id="+j+"");

string u=  Request.QueryString["id"].ToString();