  Using 0.8 million D^+D^- pairs collected with the CLEO-c detector at the
psi(3770) resonance, we have searched for flavor-changing neutral current and
lepton-number-violating decays of D^+ mesons to final states with dielectrons.
We find no indication of either, obtaining 90% confidence level upper limits of
B(D^+ -> \pi^+ e^+ e^-) < 7.4 X 10^{-6}$, B(D^+ -> \pi^- e^+ e^+) < 3.6 X
10^{-6}$, B(D^+ -> K^+ e^+ e^-) < 6.2 X 10^{-6}$, and B(D^+ -> K^- e^+ e^+) <
4.5 X 10^{-6}$.
