Question

I have a class named Student

public class Student
{
    public string Name { get; set; }
    public List<int> Marks { get; set; }
    public Student()
    {
    }
}

and I need to bind a list of Student to GridView

        List<Student> StudentList = new List<Student>();

        Student stud = new Student();
        stud.Name = "Scott";
        List<int> marks = new List<int>();
        marks.Add(10); 
        marks.Add(20); 
        marks.Add(30);
        stud.Marks = marks;

        StudentList.Add(stud);

        Student stud1 = new Student();
        stud1.Name = "Jon";
        List<int> marks1 = new List<int>();
        marks1.Add(10);
        marks1.Add(20);
        marks1.Add(30);
        stud1.Marks = marks1;

        StudentList.Add(stud1);

        GridView1.DataSource = StudentList;
        GridView1.DataBind();

The gridview shows the name field only. how I can show the list of marks also with name field. (In this all the students have same number of marks, means sometimes 3, or sometimes 5. etc.)

I need show gridview like this

Name    Mark1  Mark2 Mark3 
Scott   10     20    30
Jon     10     20    30

Answer 1

Example:

<asp:GridView ID="grid1" runat="server" AutoGenerateColumns="false" Width="100%">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:GridView ID="grid2" runat="server" AutoGenerateColumns="False" Width="100%">
                <Columns>
                    <asp:BoundField DataField="Mark" HeaderText="Mark" />
                </Columns>
            </asp:GridView>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Code:

protected override void OnInit(EventArgs e)
{
  grid1.RowDataBound += grid1_RowDataBound;
}

void grid1_RowDataBound(object sender, GridViewRowEventArgs e)
{
  var grid2 = (GridView)e.Item.FindControl("grid2");
  grid2.DataSource = StudentList.Where(w => w.Name = (e.Item.DataItem as Student).Name);
  grid2.Bind();
}

I do not test it