Nullable object must have a value?

c# .net linq-to-sql exception-handling nullable
Sealer_05 picture Sealer_05 · May 11, 2012 · Viewed 82.6k times · Source

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 
 }

Answer

Tejs picture Tejs · May 11, 2012

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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