//  
pGeometry = axMapControl1.TrackLine();
                    pRgbColor = new RgbColorClass();
                    pRgbColor.Red = 200;
                    pRgbColor.Green = 100;
                    pRgbColor.Blue = 0;

                    ISimpleLineSymbol pSimpleLineSymbol = new SimpleLineSymbolClass();
                    pSimpleLineSymbol.Color = pRgbColor;
                    pSimpleLineSymbol.Style = esriSimpleLineStyle.esriSLSDash;
                    pSimpleLineSymbol.Width = 1;
                    symbol = pSimpleLineSymbol;
                    axMapControl1.DrawShape(pGeometry,ref symbol);
