Modify an object using Reflection in c#

I'm creating a function will read all properites from an object check from certain value and modify it, I want to return back the final object with the modified result.

 private static object GetFullPropertyPaths(object finalResult)
    {
        foreach (PropertyInfo propertyInfo in finalResult.GetType().GetProperties())
        {
            if (propertyInfo.PropertyType == typeof(string))
            {
               object propertyValue = propertyInfo.GetValue(finalResult);
               if (propertyValue.ToString().StartsWith("\\"))
                {
                    string result = Sys.Config.ConfigurationRootFolder + propertyValue.ToString();
                    propertyInfo.SetValue(finalResult, result);
                }
            }
        }
        return finalResult;
    }

I know I migh need to use some sort of Deep copy of an object, I want to make sure I'm on the right track or if I missing something. Thanks