how do you hide public methods?

here is how i'm using:
i have 3 classes and classes have methods/properties
 
1) SuggustControl
2) SuggestItem
3) ColumnCollection
 
my SuggestControl is calling #2 and #3
 
here is my all  classes looks like:
 
 public class AutoSuggestMenuItem
 {
        public AutoSuggestMenuItem(string label, string value, string displaylabel) : this()
        {
            _label = label;
            _value = value;
            _displaylabel = displaylabel; 
        }
 
        public string GetJSON()
        {
            XJsonWriter writer = new XJsonWriter();
            writer.WriteNameValue("label", _label);
            writer.WriteNameValue("displaylabel", _displaylabel);
            writer.WriteNameValue("value", _value);
            writer.WriteNameValue("isSelectable", _isSelectable);
            writer.WriteNameValue("cssClass", _cssClass, true);
            return writer.ToString();
        }
 }
 
 [Serializable]
    public class ColumnsCollection
    {
         
        public ColumnsCollection() { }
 
        public ColumnsCollection(string HeaderText, Column.Align HeaderAlignment, Column.Align ItemAlignment, Unit Width, string DataField, Column.MatchType Match, bool isAutoSuggest, bool isVisible) 
        {
            this._HeaderText = HeaderText;
            this._HeaderAlignment = HeaderAlignment;
            this._ItemAlignment = ItemAlignment;  
            this._Width = Width;
            this._DataField = DataField;
            this._Match= Match;
            this._isAutoSuggest = isAutoSuggest;
            this._isVisible = isVisible;
        }
    }
 
 
i add the server control to my .aspx page and in my .aspx page
 
<%@ Register Assembly="MySuggest" Namespace="MySuggest" TagPrefix="cc1" %> 
<cc1: {i see all the classes (AutoSuggestMenuItem....ColumnsCollection }
 
 
i dont want to display the #2 and #3 classes in my .aspx page
 
i hope i explain clear enough.