Calculate and Display DateTime in ASP.Net TextBox based on Date populated from Database

This way

<asp:TextBox ID="TextBox1" runat="server" Text = "12/11/2010 12:00:00 AM"></asp:TextBox>
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

 DateTime dt = DateTime.Parse(TextBox1.Text.Split(' ')[0]);
            string year = dt.Year.ToString();
            if (dt < DateTime.Parse("06/30/" + year))
            {
                TextBox2.Text = DateTime.Parse("07/01/" + year).ToString();
            }
            else
            {
                TextBox2.Text = DateTime.Parse("12/01/" + year).ToString();
            }