Context  context = new Context();
string esql = "select t.userID,t.userName from tb_user as t where t.sex=false";
ObjectQuery<tb_user> typeRecord = ctx.CreateQuery<tb_user>(esql);
ObjectResult<tb_user> typeResult = typeRecord.Execute(MergeOption.NoTracking);
this.drpdownlist.datasource = typeResult.toList();
this.drpdownList.datatextfield ="userID";
this.drpdownList.datavaluefield ="userName";
this.drpdownList.databind();

using (NorthwindEntities context = new NorthwindEntities())
{
    ObjectQuery<Category> query = context.Categories;
    ObjectResult<Category> result = query.Execute(MergeOption.NoTracking);

    DropDownList1.DataSource = result.ToList<Category>();
    DropDownList1.DataTextField = "CategoryName";
    DropDownList1.DataValueField = "CategoryID";
    DropDownList1.DataBind();
}

------解决方案--------------------
csdn上问个问题确实垃圾，还不如百度知道
楼主用ef为啥还要用sql方式
CreateObjectSet<T>的方式会不会更好呢