difference:
Just define valid conversions between expressions and types,
Ctype can be successful,
and
DirectCast requires the runtime type of the object variable as the specified type.
performance:
If the specified type of the expression is the same, the runtime type is the same.
Directcast's runtime performance ratio
Ctype's runtime performance is good.
DIM Q as Object = 2.37 'Requires option strict to be off.
DIM I as integer = ctype (q, integer) 'succeeds.
DIM J AS INTEGER = Directcast (q, integer) 'Fails.
