Question

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The type of the conditional expression can not be determined?

I currently wrote this statement:

byte? Col_8 = (Rad_8.SelectedValue == null) ? null : byte.Parse(Rad_8.SelectedValue);

but it has this Error:

Type of conditional expression cannot be determined because there is no implicit conversion between '<null>' and 'byte'

why I can use null after ? ? what if equivalent of above code without if statement?

Answer 1

The compiler cannot infer the type of the conditional statement because null has no type and it does not consider the expected return value.
Use

(Rad_8.SelectedValue == null) ? (byte?)null : byte.Parse(Rad_8.SelectedValue);