要怎么实现datagrid一列自动相加
											 就是比如说有一列"数量",每增加一行后实现自动相加显示在TEXT控件上.
 2007-09-08 17:14
	    2007-09-08 17:14
   2007-09-08 17:17
	    2007-09-08 17:17
  LZ巴不得datagrid有这个自动相加的功能……
 2007-09-08 17:18
	    2007-09-08 17:18
   2007-09-08 17:35
	    2007-09-08 17:35
  
 2007-09-08 17:39
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 2007-09-08 17:42
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 2007-09-08 17:53
	    2007-09-08 17:53
  
select sum(数量) from table where 类型='书'
这个查询出来的数量要怎么才能赋给text控件呢
 2007-09-08 19:06
	    2007-09-08 19:06
   2007-09-08 19:07
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   2007-09-08 19:18
	    2007-09-08 19:18