C# fundamentals

1. int, double, decimal, string, char, bool are alias.
2.  Do not compare floating point numbers for equality because of precision. Use Decimal instead.
3. Must cast object-type object to proper type before being able to use its method.
4. Can call it methods directly if it is dynamic-type object. (Ex: GetType, Length). Use with other language class libraries, or COM (Excel, Word).
5. Value types variables are released while reference type variables must wait for garbage collection.
6. var local variables can be inferred by suffixing literal values with L, M, D, F; a literal number, string, true/false.
7. Value types can also use the new keyword if there is no literals to set the value. Ex: DateTime