Go to new page from new insert post ?

Hi everyone !

I have trouble with Response.Redirect to new post in my web, I need help !

MembershipUser myObject = Membership.GetUser();
        string UserID = myObject.ProviderUserKey.ToString();
        String strConnString = ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString;

        SqlConnection con = new SqlConnection(strConnString);

        SqlCommand cmd = new SqlCommand();

        cmd.CommandType = CommandType.StoredProcedure;

        cmd.CommandText = "POSTs";

        cmd.Parameters.Add("@Postx", SqlDbType.NText).Value = txttext.Text.Trim();

        cmd.Parameters.Add("@Titlex", SqlDbType.NVarChar).Value = txttest.Text.Trim();

        cmd.Parameters.Add("@UserIdx", SqlDbType.UniqueIdentifier).Value = UserID.Trim();

        cmd.Connection = con;

        try
        {

            con.Open();

            cmd.ExecuteNonQuery();
            Response.Redirect(String.Format("detail.aspx?ID={0}" + ID);

        }

        catch (Exception ex)
        {

            throw ex;

        }

        finally
        {

            con.Close();

            con.Dispose();

        }

My ID is PostID int identity in table Post, When I insert new post I want redirect to this post with new ID,

How do I get new ID which I have been insert ?

Thanks !