void CloseAll()
{
if (add != null)
{
add.Close();
}
if (setWindow != null)
{
setWindow.Close();
}
if (mlistwindow != null)
{
mlistwindow.Close();
}
if (userinfoset != null)
{
userinfoset.Close();
}
if (newagroup != null)
{
newagroup.Close();
}
}
