Difference between static, const, read-only and static read-only

Static - Static objects can have only a single memory allocation. All callers share the same memory. It is useful when we know an object is going to have a static data. For example, if I have a connection string in an application, I know the connection string is not going to change no matter how many callers use it. So I would create a static property or method, that will return connection string. Think of it like a Cigar being shared among bunch of guys.

Non Static - Each object has it's own memory space. This is like each guy has it's own cigar ;-)

Static class - The entire class is static, means has a single memory space allocated for it.

Read-only - Can not modify the value of the member. Can read it only.

Const - It's a variable you can not modify. They are used to give a better readable name to a constant value.

Static read-only - Static + read only ;)

Hope it helps.