Passing values into one form to other form without displaying a new form

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C#

ASP.NET

I work in Asp.net 2008 windowsFormapplication
I have two forms namely edit user and user wizard. At first time i want to select the user name from user wizard form so i add a button on the form. when I click the button the user wizard form display then i select the user name in there and return that value into the edit user .But there was a problem occurred ,2 edit user forms are
show. but i want the first time form only

Here i specifies my codes Please check it and give correct code

1 this code in user wizard

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Zealian
{
    public partial class Client_Wizard : Form
    {
        string name;
        public string CLName
        {
            get
            {
                return  name ;
            }
        }
        SqlConnection con = new SqlConnection("server=.;database=zealian;uid=sa;pwd=sqladmin");
        public Client_Wizard()
        {
            InitializeComponent();
        }

        private void Client_Wizard_Load(object sender, EventArgs e)
        {
            
        }

      

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            label3.Visible = false;
            SqlDataAdapter da = new SqlDataAdapter("select * from addclient  where Client_Name LIKE '" + textBox1.Text + "%' OR ClientId LIKE '" + textBox1.Text + "%'", con);
            DataSet ds = new DataSet();
            da.Fill(ds);
            dataGridView1.DataSource = ds.Tables[0];
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Project_Details pd = new Project_Details();
            pd.Clientname = CLName;
            pd.Show();
            this.Close();
        }

        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            SqlDataAdapter da = new SqlDataAdapter("select Client_Name  from addclient  where ClientId='" + dataGridView1.CurrentRow.Cells[0].Value.ToString() + "'", con);
            DataSet ds = new DataSet();
            da.Fill(ds);
            name = ds.Tables[0].Rows[0]["Client_Name"].ToString();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            ViewClient vc = new ViewClient();
            vc.Clientname = CLName;
            vc.Show();
            this.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Edit_Client ec = new Edit_Client();
            ec.Clientname = CLName;
            ec.Show();
            this.Close();

        }
    }
}

2. this code in edit user

public partial class Edit_Client : Form
   {
       public string Clientname
       {
           set
           {

               textBox8.Text = value;
           }
       }
       string id;
       SqlConnection con = new SqlConnection("server=.;database=zealian;uid=sa;pwd=sqladmin");
       public Edit_Client()
       {
           InitializeComponent();
       }