CRM Linq

//PickList values

private Dictionary<String, String> PickList(String entityName, String attID, string attName)
{
    Dictionary<String, String> dic = new Dictionary<String, String>();
    IOrganizationService service = (IOrganizationService)serviceProxy;
    QueryExpression qryExp = new QueryExpression(entityName);
    qryExp.ColumnSet = new ColumnSet(attName);
    EntityCollection entCollection = service.RetrieveMultiple(qryExp);
    dic = entCollection.Entities
        .Where(e => (e.Attributes.ContainsKey(attName)))
        .ToDictionary(e => e.Attributes[attID].ToString(), e => e.Attributes[attName].ToString());
    /*int i=1;
    foreach (var c in entCollection.Entities)
    {
        if (c.Attributes.ContainsKey(attName))
        {
        dic.Add(c.Attributes[attID].ToString(), c.Attributes[attName].ToString());
        }
    }*/
}