How to use reflection to get all the variables in an object?

I'm currently using this code to get all the variables in an object and place the data in a Dictionary (the key is a variable name, the value is the variable's contents).

foreach (var property in PropertiesOfType<string>(propertiesJSON))
{
    dictionary.Add(property.Key, property.Value);
}

In this code, propertiesJSON is the object I need. Here's the PropertiesOfType method:

public static IEnumerable<KeyValuePair<string, T>> PropertiesOfType<T>(object obj)
{
    return from p in obj.GetType().GetProperties()
           where p.PropertyType == typeof(T)
           select new KeyValuePair<string, T>(p.Name, (T)p.GetValue(obj));
}

When I test my Dictionary for any data, there are no values (I used Visual Studio's debugging stuff to check, and my program also printed out all the data inside the Dictionary - which is of course, not there). Please tell me the mistake I'm doing here (I'm still learning to code, I'm 15 at the time of posting this).

Thanks in advance.