What exactly happens in the system when a new variable is declared in the code?

When declaring a new variable in C#, several steps occur:

1. Memory allocation: Depending on the variable type (value type or reference type) and the declaration location (stack or heap), the system reserves a memory area to store the value.

2. Initialization: If the variable is declared without an explicit assignment, it receives a default value (e.g., 0 for numbers, null for reference types).

3. Name registration: The compiler associates the variable name with the allocated memory area so that it can be accessed by name later.

Example:

int number = 5;
string text;

In the first case, memory is allocated for an integer and assigned the value 5. In the second, memory is allocated for a string reference, but it currently points to null.