protected void Page_Load(object sender, EventArgs e) 
{ 
DataClassesDataContext dc = new DataClassesDataContext(双引号server=Charlie;database=DataClasses双引号); 
myGridView.DataSource = from c in dc.产品资料 where c.本期销售==5000 select new { 名称 = c.名称, 价格 = c.价格, 质量 = c.质量 }; 
myGridView.DataBind(); 
}

------解决方案--------------------

假设你的类名是 YourClass:

var list= gridview.DataSource as List<YourClass)();
var query=list.Where(x=>x.本期销售==5000).ToList();

------解决方案--------------------

那在回发前，你不会将datasource内的数据存储一下么