Question

I know that it’s impossible to cast string or bool like (int)MyString (short)MyBool and so on while it’s allowed to cast int to short.

Unfortunately I could not find explanation, why. So I’m asking it here.

Why is not allowed explicitly cast some data types (I am not asking how to convert string to other types or something like this)?

Answer 1

Refer: Casting and Type Conversions (C# Programming Guide)

Explicit conversions (casts): Explicit conversions require a cast
operator. Casting is required when information might be lost in the
conversion, or when the conversion might not succeed for other
reasons. Typical examples include numeric conversion to a type that
has less precision or a smaller range, and conversion of a base-class
instance to a derived class.

From: Explicit Conversion

Explicit conversion is required by some compilers to support narrowing
conversions. It is a language-specific way to perform conversion. In
some languages, like C# and C++, explicit conversion is performed
using casting. Casting occurs when you prefix a conversion with a data
type that defines the type of the conversion you want to perform. In
Visual Basic, the CType function is used to allow explicit conversions
of data types that are not allowed implicitly.