[Tex/LaTex] \hline with \only (or \onslide) in Beamer

Question

In a table in beamer, I would like to remove \hline after X number of slides using

\only<1>{\hline}

But this always results in an error message:

Misplaced \noalign

What can I do to overcome this (other than create a new table on the following slide)?

\documentclass{beamer}
\begin{document}
\begin{frame}
\begin{tabular}{*5{c}}
1 & 2 & 3 & 4 & \only<2>{5}\\
\only<1>{\hline}
\end{tabular}
\end{frame}
\end{document}

---

Edit:

Marco Daniel's answer does fix what I asked for above. However, it does not work when the second row begins with a multicolumn:

\documentclass{beamer}
\usepackage{multirow}
\begin{document}
\begin{frame}
\begin{tabular}{*5{c}}
\multicolumn{1}{|c|}{1} & 2 & 3 & 4 & \only<1>{5}\only<2>{\multirow{2}{*}{5}}
\onslide<1>{\\\hline}\onslide<2>{\\[-\normalbaselineskip]}
\multicolumn{1}{|c|}{1} & 2 & 3 & 4 & \only<1>{5}\only<2>{}
\end{tabular}
\end{frame}
\end{document}

Misplaced \omit

Answer 1

You must put the complete statement in \onslide:

\documentclass{beamer}
\begin{document}
\begin{frame}
\begin{tabular}{*5{c}}
1 & 2 & 3 & 4 & \only<2>{5}
\onslide<1>{\\\hline}
\onslide<2->{\\[-\normalbaselineskip]}
\end{tabular}
\end{frame}
\end{document}