private void SetDefaultDymbol()
{
IColor color = (IColor)ESRI.ArcGIS.ADF.Connection.Local.Converter.ToRGBColor(Color.Black);
ISimpleLineSymbol lineSymbol = new SimpleLineSymbolClass();
lineSymbol.Style = esriSimpleLineStyle.esriSLSSolid;
lineSymbol.Width = 1.0;
lineSymbol.Color = color;
color = (IColor)ESRI.ArcGIS.ADF.Connection.Local.Converter.ToRGBColor(Color.Navy);
if (null == m_fillSymbol)
m_fillSymbol = new SimpleFillSymbolClass();
m_fillSymbol.Color = color;
m_fillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
m_fillSymbol.Outline = (ILineSymbol)lineSymbol;
}