End of the statement given a two semicolon but they are no raising errors.

public string DoInsertTravels(string proc,string travelsname)
      {
          try
          {
              mDbconnection = conn.GetDefaultDbConnectionString();
              using (SqlCommand cmd = new SqlCommand(proc, mDbconnection))
              {
                  string Result = string.Empty;
                  cmd.CommandType = CommandType.StoredProcedure;
                  cmd.Parameters.Add("@Travelsname", SqlDbType.NVarChar, 150).Value = travelsname;
                  cmd.Parameters.Add("@Result", SqlDbType.NVarChar, 500).Direction = ParameterDirection.Output;
                  cmd.ExecuteNonQuery();
                  return Result = cmd.Parameters["@Result"].Value.ToString(); ;
              }
          }
          catch { throw; }
          finally
          {
              mDbconnection.Close();
          }
      }