find value in list

Your variable is an iterator on a selection list. If you want to retrieve a ConversionApp.ExchangeRates object you could use :

ConversionApp.ExchangeRates exchangeRate = ((IEnumerator<ConversionApp.ExchangeRates>)variable).Current;

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After that all will depend whether your ExchangeRates class defines an overloaded version of ToString() or not. If not, you will have either to define such a method if you can modify the class or define your own helper method to build the string representation from appropriate object properties and methods.

Nota 1 : the object you retrieve is an enumerator. Hence, it may allow for retrieval of several ExchangeRates instances. You will have to figure out which one is of interest for you.

Nota 2 : The Current property in the code sample may be a null reference. You should handle the case appropriately.

Do you just want to retrieve the first one you'll find ?

List<Rate> ratesList = new List<Rate>();
            ratesList.Add(new Rate("EUR", "1.0"));
            ratesList.Add(new Rate("USD", "2.5"));
            ratesList.Add(new Rate("CHF", "3.8"));

            string exchangeISO1 = "USD";

            var variable = (from l in ratesList
                            where l.ISO.Contains(exchangeISO1)
                            select l.Closing).FirstOrDefault<string>();

            if (string.IsNullOrEmpty(variable))

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Try this--move the call to Single outside of the parentheses:

var variable = (from l in ratesList
                where l.ISO.Contains(exchangeISO1)
                select l.Closing).Single();

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that would work but its returning a variable rather than the string

that would work but its returning a variable rather than the string

A) To whom are you referring?
B) Can you elaborate on "returning a variable"?

i cant just set the value of the string to variable "test" because i get this error

System.Linq.Enumerable+WhereSelectListIterator`2[ConversionApp.ExchangeRates,System.Char]

sorry your right kaufmed Thanks for your help

brilliant

NP. Glad to help  = )