public class CustomListNews : Microsoft.SharePoint.WebPartPages.WebPart
{
    public staitc string NewsListName;

    [Category("Настойки выборки")]
    [Personalizable(PersonalizationScope.User)]
    [WebBrowsable(true)]
    [WebDisplayName("Название списка")]
    [WebPartStorage(Storage.Shared)]

    public string _NewsListName
    {
        get { return NewsListName; }
        set { NewsListName = value; }
    }
    ...
}

public class CustomListNews : Microsoft.SharePoint.WebPartPages.WebPart
{
    public string NewsListName;

    [Category("Настойки выборки")]
    [Personalizable(PersonalizationScope.User)]
    [WebBrowsable(true)]
    [WebDisplayName("Название списка")]
    [WebPartStorage(Storage.Shared)]

    public string _NewsListName
    {
        get { return NewsListName; }
        set { NewsListName = value; }
    }
    ...
    protected override void CreateChildControls()
    {
        CustomListNewsUserControl control = (CustomListNewsUserControl)Page.LoadControl(_ascxPath);
        control.ParentWebPart = this; 
        Controls.Add(control);
    }
}