private void ExportStuInfo(HttpContext context, string id)
{
var exXls = new ExportXls();
var fieldsNames = new List<string>();
fieldsNames.Add("学员姓名");
fieldsNames.Add("登录名");
fieldsNames.Add("密码");
fieldsNames.Add("所属学校");
var quesBll = new BLL.Questionnaire();
var dt = quesBll.GetStuInfoofCourse(id);
var courseBll = new BLL.Course();
var courseModel = courseBll.GetModel(new Guid(id));
var filename = courseModel.CourseName + "--学员信息.xls";
exXls.ExportToXls(context.Response, fieldsNames, dt, filename);
}