Populate multiple TextBox from Database using 3 tier Architecture in C#

I need urgent help if someone helps me with how to populate multiple textbox from database with data using 3 tier architecture in asp.net.

Below is my code.

Code for UI code behind

protected void GetPatinfo(object sender, EventArgs e)
{
    //Creating the object of BAL
    txtpatname.Text = string.Empty;
 
    string recordStatus;
    string patcard = txtcardnumber.Text;
 
    try
    {
        //Passing the Parameter in the Method of BAl using BAL object
        recordStatus = objOPDCheck_BLL.GetPatinfo(patcard);
 
        if (recordStatus == null)
            Response.Write("Oops! No match");
        else
            txtpatname.Text = recordStatus;
            texpid.Text = recordStatus;
 
    }
    catch (Exception ex)
    {
        Response.Write("Oops! No match:" + ex.Message.ToString());
    }
    finally
    {
        objOPDCheck_BLL = null;
    }
}

Code for BLL

public string GetPatinfo(string patcard)
{
    try
    {
        return objOPDCheck_DAL.GetPatinfo(patcard);
    }
    catch (Exception ex)
    {
        throw ex;
    }
    finally
    {
        objOPDCheck_DAL = null;
    }
}

Code for DAL

public string GetPatinfo(string patcard)
{
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conString"].ConnectionString);
    SqlCommand cmd = new SqlCommand() { CommandType = CommandType.StoredProcedure, CommandText = "get_patient2" };
    cmd.Parameters.Add("@Identification", SqlDbType.VarChar).Value = patcard;
    cmd.Connection = con;
    con.Open();
    SqlDataReader dr;
    try
    {
        dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            return dr["Names"].ToString ();
            return dr["ID"].ToString();
        }
        else
            return dr["Names"].ToString ();
        return dr["ID"].ToString();
    }
    catch (Exception ex)
    {
        throw ex;
    }
    finally
    {
        con.Close();
        con.Dispose();
    }
}