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On the line: bool travel = fill.travel.Value; I am getting the following error:
Nullable object must have a value
and i am not sure why. All I want to do is get the value in the database of travel which is currently false. Any help would be appreciated.
using (var db = new DataClasses1DataContext()) { var fill = (from f in db.expenseHdrs where f.rptNo == getPkRowReport() select f).FirstOrDefault(); txtReportDesc.Text = fill.description; txtPeriod.Text = fill.period; txtPurpose.Text = fill.purpose; bool travel = fill.travel.Value; chkTravel.Checked = travel } 
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According to C# Nullable Documentation If a value of type T has not been assigned to the Nullable object, you can compare it to null and retrieve its HasValue property, but you cannot access its Value property or call its other members.
In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral ("null") behavior.
A nullable type can represent the correct range of values for its underlying value type, plus an additional null value. For example, Nullable<int> can be assigned any value from -2147483648 to 2147483647, or a null value. The Nullable types are instances of System.
If you want to use the default value of the underlying value type in place of null , use the Nullable<T>. GetValueOrDefault() method. At run time, if the value of a nullable value type is null , the explicit cast throws an InvalidOperationException.
You can always switch to
fill.travel.GetValueOrDefault() To provide the default (false), or the value of the boolean column from the database. Or you can specify the default with an overload. Either way, the nullable currently doesnt have a value, which is why you get that exception.
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