error Int to string?Assets/Scripts/MyConnect.cs(61,60): error CS0029: Cannot implicitly convert type `int' to `string'

trying to imp-lement the serverside high score tutorial in my facebook game and keep running into errors. Cannot use INT in a string, yet the tutorial preforms this task try to understand it.

     IEnumerator GetScores (string name, int Xp, int Lvl,  int Missions, int Cash, int Gold)
     
      {
         string hash = MD5.Md5Sum(secretKey);
         string Account_get = UserAccountURL + "name" + name + "Xp=" + Xp + "Lvl=" + Lvl +  "Gold=" + Gold + "Cash" + Cash  + Missions + hash; // return php result return values...
         WWW AccountReturn = new WWW (Account_get);
 
         yield return Account_get;
         if (AccountReturn.error != null)
         {
             print("Unable to get User account data" + AccountReturn.error);
         }
         else
         {
             // return sores as text on game objects.........
             gameObject.GetComponent<GUIText>().text =  name;
             gameObject.GetComponent<GUIText>().text =  Gold;
             gameObject.GetComponent<GUIText>().text =  Cash;
             gameObject.GetComponent<GUIText>().text =  Xp;
             gameObject.GetComponent<GUIText>().text =  Lvl;
     
 
             }
             }

need to retern values from the server database, with users "ID" / Name to return only their values not everyones values.