Empty string if null

Question

I have this in my code:

SelectList(blah, \"blah\", \"blah\", cu.Customer.CustomerID.ToString())

It gives a error when it returns null, how

Answer 1

It depends of the type of CustomerID.

If CustomerID is a string then you can use the null coalescing operator:

SelectList(blah, "blah", "blah", cu.Customer.CustomerID ?? string.Empty)

If CustomerID is a Nullable, then you can use:

SelectList(blah, "blah", "blah", cu.Customer.CustomerID.ToString())

This will work because the ToString() method of Nullable returns an empty string if the instance is null (technically if the HasValue property is false).