///   <summary> 
        ///   支持双行表头的的DataGridView 
        ///   
        ///   用法示例： 
        ///   dg.AddSpanHeader(4,   4,   "主标题 "); 
        ///   则将第4列开始的4列设为双行表头，主标题为“主标题”，子标题为原来的   Value   值 
        ///   
        ///   phommy@hotmail.com 
        ///   </summary> 
        public   partial   class   DataGridViewEx1   :   DataGridView 
        { 
                public   DataGridViewEx1() 
                { 
                        InitializeComponent(); 
                } 
                protected   override   void   OnPaint(PaintEventArgs   pe) 
                { 
                        //   TODO:   在此处添加自定义绘制代码 

                        //   调用基类   OnPaint 
                        base.OnPaint(pe); 
                } 
                private   struct   SpanInfo     //表头信息 
                { 
                        public   SpanInfo(string   Text,   int   Position,   int   Left,   int   Right) 
                        { 
                                this.Text   =   Text; 
                                this.Position   =   Position; 
                                this.Left   =   Left; 
                                this.Right   =   Right; 
                        } 

                        public   string   Text;           //列主标题 
                        public   int   Position;         //位置，1:左，2中，3右 
                        public   int   Left;                 //对应左行 
                        public   int   Right;               //对应右行 
                } 

                private   Dictionary <int,   SpanInfo>   SpanRows   =   new   Dictionary <int,   SpanInfo> ();//需要2维表头的列 
                public   void   AddSpanHeader(int   ColIndex,   int   ColCount,   string   Text) 
                { 
                        if   (ColCount   <   2) 
                                throw   new   Exception( "行宽应大于等于2，合并1列无意义。 "); 

                        //检查范围 
                        for   (int   i   =   0;   i   <   ColCount;   i++) 
                        { 
                                if   (SpanRows.ContainsKey(ColIndex   +   i)) 
                                        throw   new   Exception( "单元格范围重叠! "); 
                        } 

                        //将这些列加入列表 
                        int   Right   =   ColIndex   +   ColCount   -   1;         //同一大标题下的最后一列的索引 
                        SpanRows[ColIndex]   =   new   SpanInfo(Text,   1,   ColIndex,   Right);         //添加标题下的最左列 
                        SpanRows[Right]   =   new   SpanInfo(Text,   3,   ColIndex,   Right);       //添加该标题下的最右列 
                        for   (int   i   =   ColIndex   +   1;   i   <   Right;   i++)     //中间的列 
                        { 
                                SpanRows[i]   =   new   SpanInfo(Text,   2,   ColIndex,   Right); 
                        } 
                } 

                public   void   ClearSpanInfo() 
                { 
                        SpanRows.Clear(); 
                        //ReDrawHead(); 
                } 

                private   void   DataGridViewEx_CellPainting(object   sender,   DataGridViewCellPaintingEventArgs   e) 
                { 
                        if   (e.RowIndex   ==   -1) 
                        { 
                                if   (SpanRows.ContainsKey(e.ColumnIndex))     //被合并的列 
                                { 
                                        //画边框 
                                        Graphics   g   =   e.Graphics; 
                                        e.Paint(e.CellBounds,   DataGridViewPaintParts.Background   |   DataGridViewP