Entity Framework DbContext How to Eager Load Records Into Memory

I'm using Entity Framework 6 and DbContext. I want to eager load records from the database for the purpose of using these records in the loop. I would like to explain with example (it's just example, please don't say me it is unrealistic in real world).

I have a DataGridView which shows students list. In the Student table, every record has a column favorite_subject_id.

While showing each student record in DataGridView, I want to find and display the subject name from the Subject table with the student's favorite_subject_id (let's say there is no database relationship between them. I know it should be in real world project. But it's just an example to clear my question.)

As first, I developed this concept as the following code:

foreach (DataGridViewRow row in gridView.Rows)  
{    
    if (!row.IsNewRow)    
    {      
        var student = (Student)(row.DataBoundItem);
        var favorite_subject = dbContext.Subjects.find(student.favorite_subject_id);
        row.Cells[colFs.Index].Value = favorite_subject.subject_name.ToString();
    }  
}

But this code implementation will touch the database for every student records. It will damage the performance.

So I want to eager load the subjects records into the memory before loop. In the loop, I just want to search from these eager loaded records from the memory. The problem is that I don't know which is the right(best) way to eager load the records into the memory.

I wrote some code for this purpose. But I'm not sure whether it is right way to do.

var lstSubjects = dbContext.Subjects.ToList<Subject>();

foreach (DataGridViewRow row in gridView.Rows)  
{    
    if (!row.IsNewRow)    
    {      
        var student = (Student)(row.DataBoundItem);
        var favorite_subject= lstSubjects .Find(x => x.subject_id == student.favorite_subject_id);
        row.Cells[colFs.Index].Value = favorite_subject.subject_name.ToString();
    }  
}

So the question is which is the best way to eager load the records from the database into the memory (by using DbContext)?