Programador Novato

using System;
using Gtk;
using System.Data;
using Mono.Data.Sqlite;


public partial class MainWindow : Gtk.Window
{
    //Cadena de conexion a la bd
    string connetionString;
    //Query que va extraer los datos de la tabla
    string query;
    SqliteCommand cmd;
    SqliteConnection conn;
    SqliteDataReader dr;

    public MainWindow() : base(Gtk.WindowType.Toplevel)
    {
        Build();
        connetionString = "Data Source=data.db;Version=3;New=True;Compress=True;";
        conn = new SqliteConnection(connetionString);
        query = "select id,nombre,direccion  from personal";
        try
        {
            treeview.AppendColumn("id", new CellRendererText(), "text", 0);
            treeview.AppendColumn("nombre", new CellRendererText(), "text", 1);
            treeview.AppendColumn("direccion", new CellRendererText(), "text", 2);
            ListStore data = new ListStore(typeof(string), typeof(string), typeof(string));
            conn.Open();
            cmd = new SqliteCommand(query,conn );            dr = cmd.ExecuteReader();
            while (dr.Read ())
            {
                data.AppendValues(dr[0].ToString(), dr[1].ToString(), dr[2].ToString());
            }
            treeview.Model  = data;
            dr.Close();
            conn.Close();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }
    protected void OnDeleteEvent(object sender, DeleteEventArgs a)
    {
        Application.Quit();
        a.RetVal = true;
    }
}