用select取数据表里的数据值
DataClassesDataContext ctx = new DataClassesDataContext(); //数据源
var xh = from b in ctx.stu_mark
where b.name == Session["name"]
select b.number;

string c = xh.ToString();
this.Label4.Text = c;


运行后label4显示的值是“SELECT [t0].[number] FROM [dbo].[stu_mark] AS [t0] WHERE [t0].[name] = @p0 ”，不是用户的number值。求大神帮忙取number的值

[解决办法]
string c = xh.First().ToString();