PropertyNotFoundException Class

[SerializableAttribute]
public class PropertyNotFoundException : PropertyException

<SerializableAttribute>
Public Class PropertyNotFoundException
	Inherits PropertyException

[SerializableAttribute]
public ref class PropertyNotFoundException : public PropertyException

[<SerializableAttribute>]
type PropertyNotFoundException =  
    class
        inherit PropertyException
    end

string license = "<?xml version='1.0' encoding='utf...
WebDavSession session = new WebDavSession(license);
session.Credentials = new NetworkCredential("User1", "pwd", "DOMAIN");

IHierarchyItem item = await session.GetFileAsync(new Uri("https://server/Library/doc.txt"));
PropertyName[] propNames = new PropertyName[2];
propNames[0] = new PropertyName("ManagerApproved", "Sales");
propNames[1] = new PropertyName("Branch", "Sales");
Property[] properties = null;

try
{
    properties = await item.GetPropertyValuesAsync(propNames);
}
catch(PropertyNotFoundException ex)
{
    Console.WriteLine(ex.Message + " " + ex.PropertyName);
}
if (properties != null)
{
    foreach (Property prop in properties)
    {
        Console.WriteLine(prop.Name.NamespaceUri + ":" + prop.Name.Name + " " + prop.StringValue);
    }
}