Testing e.FormattedValue.ToString Against IsDBNull or IsNothing

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How to I test e.FormattedValue.ToString against IsDBNull or IsNothing? I tried

VB

If Not IsNothing(e.FormattedValue.ToString) Then Exit Sub

dgvPhysCME.Rows(e.RowIndex).ErrorText = "Field must not be empty"
e.Cancel = True

and

VB

If Not IsDBNull(e.FormattedValue.ToString) Then Exit Sub

When I blank out the cell it always takes the "Exit Sub" path.

Thanks, Eddie

Posted 5-Feb-11 10:43am

Eddie Niebruegge

Updated 5-Feb-11 11:48am

#realJSOP

v5

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fjdiewornncalwe · Accepted Answer · 2011-02-05T13:33:00

Solution 2

Try using the String.IsNullOrEmpty method.
MSDN Documentation.
It is likely that your FormattedValue equals string.Empty. An empty string is still a value so IsNothing won't work and IsDBNull won't work because the string value won't equal System.DBNull.Value.

Posted 5-Feb-11 13:33pm

fjdiewornncalwe

Comments

Eddie Niebruegge 5-Feb-11 20:03pm

Thanks... that worked. Eddie

Sergey Alexandrovich Kryukov 5-Feb-11 23:08pm

Of course that should have worked. A 5.
--SA

Espen Harlinn 6-Feb-11 7:32am

Good answer :)

Henry Minute · Accepted Answer · 2011-02-05T13:23:00

I am not sure that the FormattedValue can be Nothing, since it is the value to be displayed, which for a blanked cell would probably be String.Empty. The same applies to DBNull only more so, if you see what I mean.

If you want to test for DBNull then I would suggest using e.Value.

Otherwise add

VB

AndAlso Not String.IsNullOrEmpty(e.FormattedValue.ToString) Then Exit Sub