[HaBo]

Die Auflistung wurde geändert; möglicherweise wurde die Enumeration nicht ausgeführt.

private void FillTreeView()
        {
            TreeNode root = (treeView1.Nodes[0].Name == "Bibliothek" ? treeView1.Nodes[0] : treeView1.Nodes.Add("Bibliothek"));
            
            root.EnsureVisible();
            root.TreeView.Focus();
            root.TreeView.Select();

            DataSet dsCDs = LoadData("SELECT DISTINCT ID, Name FROM CDs ORDER BY Name");
            try
            {
                foreach (DataRow rowCD in dsCDs.Tables[0].Rows)
                {
                    int cdID = Convert.ToInt32(rowCD["ID"]);
                    TreeNode childRoot = new TreeNode(rowCD["Name"].ToString());
                    root.Nodes.Add(childRoot);
                    childRoot.ImageIndex = 1;
                    childRoot.SelectedImageIndex = 1;
                    childRoot.Parent.Expand();

                    DataSet dsTracks = LoadData("SELECT Title, Artist, Nr FROM Tracks WHERE FK_CDs_ID = " + cdID + " ORDER BY Nr");
                    foreach (DataRow rowTrack in dsTracks.Tables[0].Rows)
                    {
                        TreeNode childCD = new TreeNode("#" + rowTrack["Nr"].ToString() + " " + rowTrack["Artist"].ToString() + " - " + rowTrack["Title"].ToString());
                        childRoot.Nodes.Add(childCD);
                        childCD.ImageIndex = 2;
                        childCD.SelectedImageIndex = 2;
                    }
                    dsTracks.Dispose();
                }
                dsCDs.Dispose();
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }
        }