What is the difference between string.Empty and null in C#?

In C#, both string.Empty and null represent an empty string.

1. string.Empty is a constant string that represents an empty string. It is not null, but rather a string with a length of 0.
2. Null represents a reference variable not pointing to any object. For string variables, assigning it to null means it is not pointing to any string object.

The differences are as follows:

1. When using string.Empty, the variable still points to a string object, just with a length of 0. Therefore, string methods and properties can still be called on that variable.
2. When null is used, the variable does not point to any string object, so it cannot be used to call any string methods or properties.

The scenarios in which both can be used:

1. string.Empty can be used when an empty string is needed, which has a length of 0.
2. When you need to indicate an uninitialized string variable, you can use null.