function Randomstring(strLen: Integer): string;
var
  ID: string;
begin
  ID := 'QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890';
  Result := '';
  Repeat
    Result := Result + ID[Random(Length(ID)) + 1];
  until (Length(Result) = strLen)
end;