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Asked: 2026-05-10T21:41:37+00:00

I’m trying out Linq for the first time and having a bit of difficult

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I’m trying out Linq for the first time and having a bit of difficult retrieving the child objects of an entity. I have a course table which has a one to many relationship with the department table (ie. one department can have one or many courses).

When I select the a particular department I want to bind the courses relating to that particular department to a gridview however the coursecount variable always returns a zero even when there are many courses related to that particular department. The dept object seems to be populated correctly apart from the courses objects.

Am I missing something obvious?

int deptid = Convert.ToInt32(cboDepartmentList.SelectedValue); Department dept = schoolcontext.Department.First(p=> p.DepartmentID  == deptid); int coursecourse = dept.Course.Count; gvCourse.DataSource = dept.Course; gvCourse.AutoGenerateColumns = true; gvCourse.DataBind();
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1 Answer

  1. schoolcontext.Department.Include(‘Course’).First…

    EDIT: the above is the quick answer… more details are here if you want them.

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