Is there a built-in C# method to go from an empty string to null value?

There are many times in which I have an input text, and, if it's empty (if the user didn't type any text, for example), I want to send a null value to the DB query.

I do not want to send String.Empty. (or "").

Thus I find myself doing this a lot:

var mySqlValue =  string.IsNullOrEmpty( tbCustomerId.Text)?null:tbCustomerId.Text;

This seems ugly to me. .NET gives a lot of other solutions for the opposite scenarios:

string.IsNullOrEmpty
string.IsNullOrWhiteSpace
myProblemVal ?? myDefultVal

Is there anything built-in to C# that lets me do this a shorter way, like the opposite direction?

I know this can be solved by writing my own extension methods and I know how to do that; that's not a solution I'm interested in.

I'm looking for some code like "if empty -> null".