if (condition1 && condition2 && condition3)
{
    // Do something
}

if ((object != null) && (object.SomeFunc() != value))
{
    // A bad way of checking (or so I thought)
}

if (object != null)
{
    if (object.SomeFunc() != value)
    {
        // A much better and safer way
    }
}

// perfectly legal and quite a standard way to express in C++/C#
if( x != null && x.Count > 0 ) ...

// will fail in VB6 if x is Nothing.
If x Is Not Nothing And x.Count > 0 Then ...