Showing Difference between two datetime values in hours

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I am retrieving two date time values from the database. Once the value is retrieved, I need the difference between the two values.
For that, I create a timespan variable to store the difference of the 2 date values.

TimeSpan? variable = datevalue1 - datevalue2;

Now i need to show the difference which is stored in the Timespan variable in terms of number of hours.
I referred to TimeSpan.TotalHours but couldn’t apply the same for some reason.
How do I do that?
I am using C# on a MVC project. I simple need to show the difference value in hours?

EDIT:
Since timespan was nullable, i couldn’t use the total hours property. Now I can use it by doing TimeSpanVal.Value.TotalHours;

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