public void IsReversestyleThemeGridRange()
{           
    Layer layerTheme = mapControl1.Map.Layers.Add(m_targetDataset, true);   
    DialogResult isReversestyle = MessageBox.Show("是否对分段专题图中分段的风格进行反序显示！", "是否对分段专题图中分段的风格进行反序显示！", MessageBoxButtons.YesNo);
    if (isReversestyle == DialogResult.Yes)
    {
        ThemeGridRange themeGridRangeForReverse = layerTheme.Theme as ThemeGridRange;
        themeGridRangeForReverse.ReverseColor();
    }
}