Dynamically Increment grid-view columns when field adding in database.

protected void Page_Load(object sender, EventArgs e)
  {
      SqlConnection con = new SqlConnection(@"Data Source=.;Initial Catalog=test;Integrated Security=True");
      string statment = "select * from Items ";
      SqlDataAdapter da = new SqlDataAdapter(statment, con);
      DataTable dt = new DataTable();
      da.Fill(dt);
      GridView1.DataSource = dt;
      int ColNumber = dt.Columns.Count;
      for (int i = 0; i < ColNumber; i++)
      {
          BoundField bu = new BoundField();
          string col_name = dt.Columns[i].ColumnName;
          bu.HeaderText = col_name;
          bu.DataField = col_name;
          GridView1.Columns.Add(bu);
      }
      GridView1.DataBind();
  }

<div>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
    </asp:GridView>
</div>