protected virtual bool ParseNodeId(string id, out TK parsed)
        {
            parsed = default(TK);
            if (string.IsNullOrEmpty(id)) return false;
            try
            {
                parsed = (TK)Convert.ChangeType(id, typeof(TK));
            }
            catch (Exception)
            {
                return false;
            }            
            return true;
        }

public class TestConvert
    {
        public virtual bool ParseNodeId<TK>(string id, out TK parsed)
        {
            parsed = default(TK);
            if (string.IsNullOrEmpty(id)) return false;
            var typeCode = Type.GetTypeCode(typeof(TK));
            if (!(parsed is IConvertible) || typeCode == TypeCode.Empty || typeCode == TypeCode.Object)
                return false;
            parsed = (TK)Convert.ChangeType(id, typeof(TK));
            return true;
        }
    }
	
void Main()
{
	var tk = new TestConvert();
	int parsedInt;
	bool result = tk.ParseNodeId<int>("aaa", out parsedInt);	
	Console.WriteLine (result);
	Console.WriteLine (parsedInt);
}