CrystalReports, c# - The string is non-numeric problem

[Mike]

I use MS SQL EXPRESS DB
VS 2005, c#
Win Application

I have problem "The string is non-numeric"

with formula

CDbl({pr_DajPonudu;1.KolicinskiPopust})/100 * {@NajamProstora}

File KolicinskiPopust is carChar(25) within MS SQLEXPRESS DB

I found description error and possible solution:
The string is non-numeric.
The argument to the ToNumber function must be a number stored as a
string
(for example, a customer number, an ID number, and so on). The string
may
be preceded by a minus sign and may contain leading and trailing
blanks. You
have used an argument that is non-numeric and therefore cannot be
converted to a number. Change the argument to numeric and recheck.

How I can reslove that?

Thanks

 

[Nicholas Paldino [.NET/C# MVP]]

Well, what is actually in this field? The report is seeing a
non-numeric value.

Are you sure that there are no non-numeric values being passed to this?