How can I return key value pair from a function

I am implementing a function in C#. This is the function in my class.I need to get the values from the function to the form.

    public void GetRoles(string strGetRoles)
    {
        string keyObj;
        string valueObj;
        var parseTree = JsonConvert.DeserializeObject<JObject>(strGetRoles);

        foreach (var prop in parseTree.Properties())
        {
            dynamic propValue = prop.Value;
            if (prop.Name == "roles" && prop.Value.HasValues)
            {
                foreach (var proval in propValue)
                {
                    keyObj = (string)proval.Name;
                    valueObj = (string)proval.Value;                                               
                }
            }
            else if (prop.Name == "groups" && prop.Value.HasValues)
            {
                foreach (var proval in propValue)
                {
                    keyObj = (string)proval.Name;
                    valueObj = (string)proval.Value;
                }
            }
        }
 }

strGetRoles is the response string I get after fetching json api. the propvalue I get is {"roles": {"3": "Reseller","2": "Admin end user"},"groups": []}

Now I want to call this function and get each value in an object or string array.How to return these key pair values? Thanks in advance!