Get sharepoint document library Field/column values

Hi

I have a simple document library and i want to loop threw all my documents and get a specific value from custom field/column i created in my library.

Here is my code:

List docList = context.Web.Lists.GetByTitle("IKSRevisjon");
                    context.Load(docList);

                    CamlQuery camlQuery = new CamlQuery();
                    //camlQuery.ViewXml = "<View Scope='RecursiveAll '></View>";
                    camlQuery.ViewXml = @"<View Scope='RecursiveAll '>
                                    <Query>
                                    </Query>
                                </View>";

                    ListItemCollection listItems = docList.GetItems(camlQuery);
                    context.Load(listItems);
                    context.ExecuteQuery();

                    foreach (ListItem listItem in listItems)
                    {
                        Console.WriteLine("Id: {0} ", listItem.Id);
                        string title = listItem.FieldValues["Created_x0020_By"].ToString();
                        var avd = listItem.FieldValues["Avdeling"].ToString();
                        Console.WriteLine("Title", title);
                        Console.WriteLine("Avdeling", avd);
                    }

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i get the value of "Created By":

string title = listItem.FieldValues["Created_x0020_By"].ToString();

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but why cant i get value from other fields...?