Saya memiliki beberapa lapisan gambar di panel saya

Saya membuat panel dan meletakkan teks di atasnya dengan DrawString dan DrawRectangle. Untuk Melukis panel saya menggunakan acara Paint dan metode Invalidate tetapi ketika Invalidate dipanggil, saya mendapatkan hasil berikut (dengan warna belakang transparan):Panel saya dengan tali serut

Seperti yang Anda lihat, teksnya digambar tetapi apa yang ada di baliknya tidak hilang seolah-olah Invalidate sedang melakukan setengah tugasnya.

Saya telah menyetel DoubleBuffered ke true dan saya mencoba Graphics.Clear tetapi tidak berhasil.

Tolong seseorang dapat membantu saya?

Ada kodenya:

            int x = 0;
        int y = arrowUpHeight;
        int traceIndex = 0;
        lock (_lockDraw)
        {
            while (y < Height)
            {
                rect = new Rectangle(x, y, Width, 20);
                r = new Rectangle(x, y, rect.Width + 1, rect.Height + 1);
                bufferGraphics.SetClip(r);

                if (traceIndex < traceList.Count)
                {
                    if (traceIndex < numberOfTraces)
                    {
                        Line data = traceList[traceIndex];
                        if (traceIndex % 2 == 0)
                        {
                            bufferGraphics.FillRectangle(brushEven, rect);
                        }
                        else
                        {
                            bufferGraphics.FillRectangle(brushOdd, rect);
                        }
                        if (y < mousePositionY && mousePositionY < y + 20)
                        {
                            traceSelected = true;
                            traceList[traceIndex].Selected = true;
                            listLinesVisible[traceIndex].Selected = true;
                            listLines[listLines.IndexOf(traceList[traceIndex])].Selected = true;
                            indexRightClick = traceIndex;
                        }
                        else
                        {
                            if (listLines.IndexOf(traceList[traceIndex]) < listLines.Count && listLines.IndexOf(traceList[traceIndex]) >= 0)
                            {
                                traceList[traceIndex].Selected = false;
                                listLinesVisible[traceIndex].Selected = false;
                                listLines[listLines.IndexOf(traceList[traceIndex])].Selected = false;
                            }
                        }
                        if (traceList[traceIndex].Message.ToUpper().Contains(textBoxRUISearch.MyTextBox.Text.ToUpper()) && textBoxRUISearch.MyTextBox.Text != String.Empty)
                        {
                            bufferGraphics.FillRectangle(searchBrush, rect);
                        }
                        if (traceList[traceIndex].Selected)
                        {
                            //doesn't work correctly for the moment when scrolling
                            bufferGraphics.FillRectangle(selectedBrush, rect);
                            bufferGraphics.DrawString(data.Date, traceFont, selectedStringBrush, xTime, y);
                            bufferGraphics.DrawString(data.LevelString, traceFont, selectedStringBrush, xLevel, y);
                            bufferGraphics.DrawString(data.Source, traceFont, selectedStringBrush, xSource, y);
                            if (data.Attachment != null)
                            {
                                bufferGraphics.DrawString("Attachment : ", traceFont, selectedStringBrush, xMessage, y);
                                bufferGraphics.DrawString(data.Message, traceFont, selectedStringBrush, xMessage + (xMessage / 5), y);
                            }
                            else
                                bufferGraphics.DrawString(data.Message, traceFont, selectedStringBrush, xMessage, y);
                        }
                        else
                        {
                            bufferGraphics.DrawString(data.Date, traceFont, stringBrush, xTime, y);

                            // Info = 1, Warning = 2, Error = 3, Debug = 5, Special = 6
                            switch (data.LevelString)
                            {
                                case "Info":
                                    bufferGraphics.DrawString(data.LevelString, traceFont, brushInfo, xLevel, y);
                                    break;
                                case "Warning":
                                    bufferGraphics.DrawString(data.LevelString, traceFont, brushWarning, xLevel, y);
                                    break;
                                case "Error":
                                    bufferGraphics.DrawString(data.LevelString, traceFont, brushError, xLevel, y);
                                    break;
                                case "Debug":
                                    bufferGraphics.DrawString(data.LevelString, traceFont, brushDebug, xLevel, y);
                                    break;
                                default:
                                    break;
                            }
                            bufferGraphics.DrawString(data.Source, traceFont, stringBrush, xSource, y);

                            if (data.Attachment != null)
                            {
                                bufferGraphics.DrawString("Attachment : ", traceFont, brushAttachment, xMessage, y);
                                bufferGraphics.DrawString(data.Message, traceFont, stringBrush, xMessage + (xMessage / 5), y);
                            }
                            else
                                bufferGraphics.DrawString(data.Message, traceFont, stringBrush, xMessage, y);
                        }
                        bufferGraphics.DrawRectangle(Pens.LightGray, rect);
                        //
                        //                      if (data.selected)
                        //                      {
                        //                          Color color = Color.FromArgb(100, 0, 0, 255);
                        //                          Brush brush = new SolidBrush(color);
                        //                          _bufferGraphics.FillRectangle(brush, rect);
                        //                      }
                    }
                    else
                    {
                        if (listLines.ElementAtOrDefault(listLines.Count - 1) != null)
                            listLines.RemoveAt(listLines.Count - 1);

                        if (listLinesVisible.ElementAtOrDefault(listLinesVisible.Count - 1) != null)
                            listLinesVisible.RemoveAt(listLinesVisible.Count - 1);

                        y -= 20;
                    }
                }
                else
                    bufferGraphics.FillRectangle(brushUnderTraces, rect);

                y += 20;
                traceIndex++;
            }
        }
        this.panelTraces.Invalidate();

Dimana bufferGraphics adalah objek Grafik saya.