coneverting list in to string

public  Dictionary<string,> ReasonErrorCodeList
        {
            set
            {
                if (_list.Count> 0)
                {
                  foreach (KeyValuePair<string,> pair in _list)
                  {
                      _list.Add(pair.Key,"1234");
                         
                      
                  }
                  string x = _list.ToString();
                    //string y = _list.
                  infoMessage.Text = string.Format("the list is ",x);
                  infoPanel.Visible = true;
                }
            }
            
            get { 
                
           
                //_list.Add (infoMessage.Text,"ERR_OOOOO1");
                return infoMessage.Text;
            }
         
        }
 

        
          /// Auto-generated field.
         /// To modify move field declaration from designer file to code-behind file.
   
        protected global::System.Web.UI.WebControls.Literal infoMessage;