Why is the default value of the string type null instead of an empty string?

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Why is the default value of the string type null instead of an empty
string?

Because string is a reference type and the default value for all reference types is null.

It’s quite annoying to test all my strings for null before I can
safely apply methods like ToUpper(), StartWith() etc…

That is consistent with the behaviour of reference types. Before invoking their instance members, one should put a check in place for a null reference.

If the default value of string were the empty string, I would not have
to test, and I would feel it to be more consistent with the other
value types like int or double for example.

Assigning the default value to a specific reference type other than null would make it inconsistent.

Additionally Nullable<String> would make sense.

Nullable<T> works with the value types. Of note is the fact that Nullable was not introduced on the original .NET platform so there would have been a lot of broken code had they changed that rule.(Courtesy @jcolebrand)

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