Conditional expressions in C# using XPath

I've to create an entity object using the data available from an input xml. The value of one of the properties of this object depends on a condition and it looks like this in XPath :

if (//trade/tradeHeader/tradeTypology/tradeCategoryTypology[tradeCategory = 'TechnicalCancellation']) then 'Y' else 'N'")

And the below function takes this XPath and the xml document :

private static string GetValueFromXml(XmlDocument xDoc, string xPath)
    {
        var nod = xDoc.SelectSingleNode(xPath);
        if (nod != null)
            return nod.InnerText;
        return null;
    }

However, it doesn't work. The error is :

'if (//trade/tradeHeader/tradeTypology/tradeCategoryTypology[tradeCategory = 'TechnicalCancellation']) then 'Y' else 'N'' has an invalid token.

So my questions are :

1. Is this conditional expression supported in C#/.Net (4.5) ?


2. If not, what's the recommended approach when we have to check for multiple conditions in XPath ?

Thanks Dileep