title: how to concatenate value of dropdown list
body: <p>I have three dropdown lists. From these three I have to select various path to retrieve one folder. The problem is path can't retrieve the folder and give error can't find a part of path. My code for that is.</p>
  
  <pre><code>protected void Btn_Load_Click1(object sender, EventArgs e)
  
  
      {
  
          string _username = ConfigurationManager.AppSettings["ImpersonatedUserName"].ToString();
          string _password = ConfigurationManager.AppSettings["ImpersonatedPassword"].ToString();
          string _domain = ConfigurationManager.AppSettings["ImpersonatedDomain"].ToString();
  
          Impersonation objImpersonation = new Impersonation();
  
          if (objImpersonation.impersonateValidUser(_username, _domain, _password))
          {
  
  
  
  
          string PathFecha = ConfigurationManager.AppSettings.ToString() + "\\Convert.ToString(Drp_List1.SelectedItem)\\Convert.ToString(Drp_List2.SelectedItem)\\Convert.ToString(Drp_List3.SelectedItem)\\";
  
              string[] files = System.IO.Directory.GetFiles(PathFecha);
              foreach (string filename in files)
              {
                ListBox1.Items.Add(new ListItem(System.IO.Path.GetFileName(filename), filename));
  
              }
  
          }
      }
  </code></pre>