おかしい

Error.cs

public class ColumnData
	{
		public string Track;
		public string Follow;
		public string AccountName;
		public string Tille;
        public string Image;
		public Column.StartType ColumnType;
		public ColumnData Set(string _AccountName, string _Title, string _Track, string _Follow, Column.StartType Start)
		{
			return new ColumnData() { AccountName = _AccountName, Tille = _Title, Track = _Track, Follow = _Follow, ColumnType = Start,Image = "null"};
		}
		public ColumnData Set(string _AccountName, string _Title, string _Track, string _Follow, Column.StartType Start,string b)
		{
			return new ColumnData() { AccountName = _AccountName, Tille = _Title, Track = _Track, Follow = _Follow, ColumnType = Start,Image = b};
		}
		public Column ToColumn(Main m)
		{
			var v = new Twitterizer.Streaming.StreamOptions();
			v.Track.AddRange(Rc.CutString(",", Track));
			v.Follow.AddRange(Rc.CutString(",", Follow));
			try
			{
                if (Image == "null")
                    return new Column(new Twitterizer.Streaming.TwitterStream(m.Accounts[AccountName].OAuthTokens, "Alicium", v), ColumnType, Tille);
                else
                {
//読み込み部分
                    var f = File.Open(Image, FileMode.Open,FileAccess.Read);
                    var b = Bitmap.FromStream(f);
                    f.Close();
                    return new Column(new Twitterizer.Streaming.TwitterStream(m.Accounts[AccountName].OAuthTokens, "Alicium", v), ColumnType, Tille, (Image)b.Clone());

                }
			}
			catch
			{
				MessageBox.Show("Can't find "+AccountName+" from accounts data.Please authenticate again.","Not Found",MessageBoxButtons.OK,MessageBoxIcon.Exclamation,MessageBoxDefaultButton.Button1,MessageBoxOptions.DefaultDesktopOnly,false);
				return null;
			}
		}
	}
public partial class Column : Form
	{
        public Image back;
        public Column(TwitterStream stream, StartType s, string title,Image b)
        {
            InitializeComponent();
            back = (Image)b.Clone();
            listView1.BackgroundImage = back;
//デバッグ用画像表示クラス、正常に表示
            hoge.ShowF(back);
//なぜかlistview1.BackgroundImageが表示されない
            listView1.SmallImageList = new ImageList();
			ts = stream;
			if (s == StartType.UserStream)
			{
                ts.StartUserStream(null, new StreamStoppedCallback((x) => { toolStripStatusLabel1.Text = "Stopped."; }), new StatusCreatedCallback(x => { Add(x); }), null, null, null, new EventCallback(x => { Event(x); }), null);
				var tt = TwitterTimeline.HomeTimeline(stream.Tokens);
				try
				{
					foreach (var tss in tt.ResponseObject)
					{
						timeline.Add(tss);
					}
				}
				catch
				{
					MessageBox.Show(tt.ErrorMessage);
				}
			}
			else if (s == StartType.FilterStream)
			{
				string query = "";
                if (ts.StreamOptions.Track.Count != 0)
                {
                    foreach (string ss in ts.StreamOptions.Track)
                    {
                        query += ss + "+AND+";
                    }
                    query = query.Remove(query.Length - 5, 5);
                }
                ts.StartPublicStream(new StreamStoppedCallback((x) => { toolStripStatusLabel1.Text = "Stopped."; }), new StatusCreatedCallback(x => { Add(x); }), null, new EventCallback(x => { Event(x); }));
				var tt = TwitterSearch.Search(ts.Tokens, query, new SearchOptions() { ResultType = SearchOptionsResultType.Popular });
				try
				{
					foreach (var tss in tt.ResponseObject)
					{
						timeline.Add(new TwitterStatus() { Text = tss.Text, User = new TwitterUser() { ScreenName = tss.FromUserScreenName } });
					}
				}
				catch
				{
					MessageBox.Show(tt.ErrorMessage);
				}
			}
			else if (s == StartType.Mentions)
			{
				ts.StreamOptions.Track.Add("@" + ExtendedOAuthTokens.Tokens.First<ExtendedOAuthTokens>((x) => { return x.OAuthTokens == ts.Tokens; }).UserName);
                ts.StartPublicStream(new StreamStoppedCallback((x) => { toolStripStatusLabel1.Text = "Stopped."; }), new StatusCreatedCallback(x => { Add(x); }), null, new EventCallback(x => { Event(x); }));
				var tt = TwitterTimeline.Mentions(stream.Tokens);
				try
				{
					foreach (var tss in tt.ResponseObject)
					{
						timeline.Add(tss);
					}
				}
				catch
				{
					MessageBox.Show(tt.ErrorMessage);
				}
			}
			st = s;
			this.Text = title;
			Columns.Add(this);
            ShowF();
		}