Question

I’m trying to Bind 3 textboxes to a Class that retrieves any previously stored records for each of the 3 textboxes. I don’t know how to retrieve 3 different values from a class in a Object Orientated perspective. I know how to return single strings, bool, etc vars but not more than 1 at a time.

example of a simple bool returning method I use, how do I adjust it to return 3 separate string variables – Code Snippet:

public static Boolean isQuestionnaireComplete(string strHash)
        {
            SqlConnection con = Sql.getConnection();

            try
            {
                SqlCommand cmd = new SqlCommand("SELECT IsComplete FROM UserDetails WHERE Hash='" + strHash + "' AND IsComplete=1");
                cmd.Connection = con;
                DataTable dt = new DataTable();
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                con.Open();
                da.Fill(dt);
                if (dt.Rows.Count == 0)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            catch
            {
                //TODO:log error
                return false;
            }
            finally
            {
                con.Close();
            }
        }

ASPX Snippet:

<asp:TextBox runat="server" ID="txt1" Height="200px" Width="600px"></asp:TextBox>
<asp:TextBox runat="server" ID="txt2" Height="200px" Width="600px"></asp:TextBox>
<asp:TextBox runat="server" ID="txt3" Height="200px" Width="600px"></asp:TextBox>

Answer 1

You would need to return your own structure with the 3 values. You can do an array, but you have to make sure you know which item in the array matches the textbox with a data structure you don’t have, to remember [0] == the first textbox, and you can use friendly names for more readability and easier to maintain.

public static MyDataStructure isQuestionnaireComplete(string strHash)
{
    SqlConnection con = Sql.getConnection();

    try
    {
        SqlCommand cmd = new SqlCommand("SELECT IsComplete, FirstString, SecondString, ThridString FROM UserDetails WHERE Hash='" + strHash + "' AND IsComplete=1");
        cmd.Connection = con;
        DataTable dt = new DataTable();
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        con.Open();
        da.Fill(dt);

        if (dt.Rows.Count == 0)
        {
            return null;
        }
        else
        {
            // Populate object from data table
            DataRow row = dt.Rows[0];

            retun new MyDataStructure
              {
                MyFirstString = row["FirstString"],
                MySecondString = row["SecondString"],
                MyThirdString = row["ThridString"]
              };
        }
    }
    catch
    {
        //TODO:log error
        return false;
    }
    finally
    {
        con.Close();
    }
}

public class MyDataStructure
{
  public string MyFirstString { get; set; }
  public string MySecondString { get; set; }
  public string MyThirdString { get; set; }
}