How do I resolve the error “Expression must evaluate to a node-set” when checking for the existence of a node?

Question

I\'m attempting to check for the existence of a node using the following .NET code:

xmlDocument.SelectSingleNode(
        String.Format(\"//ErrorTable/Projec         


        

Answer 1

Try:

Node node = xmlDocument.SelectSingleNode(String.Format("//ErrorTable/ProjectName = '{0}'", projectName));

if (node != null) {
    // and so on
}

Edit: silly error