Conversion from type 'DBNull' to type 'String' is not valid.

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Hi,

I am getting the error "Conversion from type 'DBNull' to type 'String' is not valid."

see the code
------------

Currency.SelectedValue = IIf(IsDBNull(Trim(Rdr("CurrencyCode"))), "", Trim(Rdr("CurrencyCode")))

what is the problem..?

Posted 26-Jul-11 22:32pm

gani7787

Updated 26-Jul-11 22:43pm

raju melveetilpurayil

v2

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Prerak Patel · Answer 1 · 2011-07-26T22:35:00

Solution 2

Don't use IIF, use If conditions.
IIF evaluates whole expression without considering condition.

Posted 26-Jul-11 22:35pm

Prerak Patel

Firo Atrum Ventus · Answer 2 · 2011-07-26T22:35:00

Solution 1

The Trim(). Try this:

Currency.SelectedValue = IIf(IsDBNull(Rdr("CurrencyCode")), "", Trim(Rdr("CurrencyCode")))

[Edit]
Prerak's right, I forgot that it is VB you are using. Still, the Trim() in the conditional should be removed.
[/edit]
[edit2:Sorry I got your name wrong]

Posted 26-Jul-11 22:35pm

Firo Atrum Ventus

Updated 26-Jul-11 22:41pm

v3

Nitin_Verma · Answer 3 · 2011-07-26T22:38:00

Solution 3

You can also check value with DBNull.Value

If Rdr("CurrencyCode")=DBNull.Value
End If
Regards,
Nitin Verma

Posted 26-Jul-11 22:38pm

Nitin_Verma

Toniyo Jackson · Answer 4 · 2011-07-26T22:58:00

Solution 4

Try this.

Currency.SelectedValue = IIf(IsDBNull(Rdr("CurrencyCode")) = True, "", Trim(Rdr("CurrencyCode")))

Posted 26-Jul-11 22:58pm

Toniyo Jackson