protected void supported_domain_SelectedIndexChanged(object sender, EventArgs e)
{
    domain = supported_domain.SelectedItem.Text;
}

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        //make sure this is a valid request
        if (!(util.IsValidRequest(Request, "qmetro.com")))
        {
            Response.Redirect("http://www.qmetro.com");
        }
        else
        {
            //first we must decide which View we will be showing
            switch (Request.QueryString["action"].ToString())
            {
                case "webMail":
                    SetView(ActiveView.WebMail);                       
                    break;
                case "csvFile":
                    SetView(ActiveView.CSVFile);
                    break;
                default:
                    Response.Redirect("http://www.qmetro.com");
                    break;
            }
        }
        try
        {
            DataSet domains = util.BuildDataSet(Server.MapPath("TextFiles/supported_domains.txt"), "Domains", "\t");
            supported_domain.DataSource = domains;
            supported_domain.DataTextField = domains.Tables[0].Columns[0].ToString();
            supported_domain.DataValueField = domains.Tables[0].Columns[0].ToString();
            supported_domain.DataBind();
            supported_domain.Items.Insert(0, "[Select One]");
            //now we will sort the DropDownList
            util.SortDropDownList(supported_domain);
            supported_domain.SelectedIndex = -1;
        }
        catch
        {
            Response.Write(util.Message);
        }
        btnWriteMessage.Attributes.Add("onclick", "return CheckContacts();return false;");
        contactsList.Visible = false;
        btnWriteMessage.Text = "Continue ->";
        messagePanel.Visible = false;
        Email.Focus();
    }
}

#region BuildDataSet
/// <summary>
/// method to read a text file into a DataSet
/// </summary>
/// <param name="file">file to read from</param>
/// <param name="tableName">name of the DataTable we want to add</param>
/// <param name="delimeter">delimiter to split on</param>
/// <returns>a populated DataSet</returns>
public DataSet BuildDataSet(string file,string tableName,string delimeter)
{
    //create our DataSet
    DataSet domains = new DataSet();
    //add our table
    domains.Tables.Add(tableName);
    try
    {
        //first make sure the file exists
        if (File.Exists(file))
        {
            //create a StreamReader and open our text file
            StreamReader reader = new StreamReader(file);
            //read the first line in and split it into columns
            string[] columns = reader.ReadLine().Split(delimeter.ToCharArray());
            //now add our columns (we will check to make sure the column doesnt exist before adding it)
            foreach (string col in columns)
            {
                //variable to determine if a column has been added
                bool added = false;
                string next = "";
                //our counter
                int i = 0;
                while (!(added))
                {
                    string columnName = col;
                    //now check to see if the column already exists in our DataTable
                    if (!(domains.Tables[tableName].Columns.Contains(columnName)))
                    {
                        //since its not in our DataSet we will add it
                        domains.Tables[tableName].Columns.Add(columnName, typeof(string));
                        added = true;
                    }
                    else
                    {
                        //we didnt add the column so increment out counter
                        i++;
                    }
                }
            }
            //now we need to read the rest of the text file
            string data = reader.ReadToEnd();
            //now we will split the file on the carriage return/line feed
            //and toss it into a string array
            string[] rows = data.Split("\r".ToCharArray());
            //now we will add the rows to our DataTable
            foreach (string r in rows)
            {
                string[] items = r.Split(delimeter.ToCharArray());
                //split the row at the delimiter
                domains.Tables[tableName].Rows.Add(items);
            }
        }
        else
        {
            throw new FileNotFoundException("The file " + file + " could not be found");
        }
        
    }
    catch (FileNotFoundException ex)
    {
        _message = ex.Message;
        return null;
    }
    catch (Exception ex)
    {
        _message = ex.Message;
        return null;
    }
    
    //now return the DataSet
    return domains;
}
#endregion

#region SortDropDownList
/// <summary>
/// method to sort a DropDownList
/// </summary>
/// <param name="ddl">DropDownList to sort</param>
public void SortDropDownList(DropDownList ddl)
{
    //create a ListItem array the size of the items
    //in your DropDownList
    ListItem[] sorted = new ListItem[ddl.Items.Count];
    //loop through all the items in your ListItem array
    for (int i = 0; i < sorted.Length; i++)
    {
        //resize the array on each iteration
        Array.Resize(ref sorted, i);
        //add the current index to the array
        sorted[i] = ddl.Items[i];
    }
    //call Array.Sort to sort your ListItem array
    Array.Sort(sorted);
    //remove all items from the DropDownList
    ddl.Items.Clear();
    //add the sorted items to the DropDownList
    ddl.Items.AddRange(sorted);
}
#endregion