Failure sending mail.

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C#

ASP.NET

i have error message (Failure sending mail)

in public class i have this code to send message:

public static bool sendMail(string subject, string msg, string to)
{
    MailMessage mmsg = new MailMessage("wolf@gmail.com", to, subject, msg);
    mmsg.IsBodyHtml = true;

    SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
    client.UseDefaultCredentials = false;
    NetworkCredential cre = new NetworkCredential("wolf1@gmail.com", "yourPass");
    client.Credentials = cre;
    client.EnableSsl = true;

    try
    {
        client.Send(mmsg);
        return true;
    }
    catch
    {
        return false;
    }
}

in another class i have a method

in my class called member i have two methods

private void initialize(CommandType CT,string DBcall)
{
    conn = new SqlConnection();
    cmd = new SqlCommand();

    //requirement
    conn.ConnectionString = ConfigurationManager.ConnectionStrings[1].ToString();
    cmd.Connection = conn;
    cmd.CommandType =CT ;
    cmd.CommandText = DBcall;
    conn.Open(); 
}

public DataTable runQuery(string select)
{
  initialize(CommandType.Text, select);
  tbl = new DataTable();
  tbl.Load(cmd.ExecuteReader());
  conn.Close();
  return tbl;
}

in class call member i have method :

public string getEmail(string userName)
{
    try
    {
        return dbVar.runQuery("select email from members where userName= '" + userName + "' ").Rows[0][0].ToString();
    }
    catch
    {
        return "";
    }


}

In may page i have wizard control when i double click in it i call above class code

protected void Wizard1_FinishButtonClick(object sender, WizardNavigationEventArgs e)
{
    member m=new member();

   if (utility.sendMail("leader order ", lblMessage.Text, m.getEmail(c.UserName)))
       lblMessage.Text += "email sent to conformation ,to your email ";
   else
       lblMessage.Text += "email not sent :" + m.getEmail(c.UserName);