Senior .Net Developer Interview Question:

Please explain the difference between constants and read-only variables?

Submitted by: Muhammad

While constants and read-only variable share many similarities, there are some important differences:

☛ Constants are evaluated at compile time, while the read-only variables are evaluated at run time.
☛ Constants support only value-type variables (the only exception being strings), while read-only variables can hold reference-type variables.
☛ Constants should be used when the value is not changing during run time, and read-only variables are used mostly when their actual value is unknown before run time.
☛ Read-only variables can only be initialised at the time of declaration or in a constructor.
Submitted by: Muhammad