Gridview is Not binding properly

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C#

ASP.NET

LINQ

C#4.0

Gridview

i have a linq query in which i am using Group By and i am binding a gridview using this query but gridview is not binding properly in all rows of gridview it shows
"System.Linq.Enumerable+WhereSelectEnumerableIterator2[<>f__AnonymousType6526[System.Nullable`1[System.Int32],System.String,System.String,System.String,System.String,System.Int32],System.String]"
my aspx page is:

<Columns>
                            <asp:TemplateField HeaderText="Sl no." ItemStyle-HorizontalAlign="Center">
                                <ItemTemplate>
                                    <div style="margin: 0px auto; width: auto;">
                                        <asp:Label ID="lblslno" runat="server" Text='<%#Container.DisplayIndex+1 %>'>'></asp:Label>
                                        <asp:HiddenField ID="hf" runat="server" Value='<%#Eval("EmpId") %>' />
                                    </div>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:BoundField HeaderText="Employee Code." DataField="EmpCode" ItemStyle-HorizontalAlign="Center" />
                            <asp:BoundField HeaderText="Employee Name" DataField="Name" />
                            <asp:BoundField HeaderText="Department" DataField="DeptName" />
                            <asp:BoundField HeaderText="Designation" DataField="DesigName" />
                            <asp:TemplateField HeaderText="Total Marks" ItemStyle-HorizontalAlign="Center">
                                <ItemTemplate>
                                    <asp:Label ID="lblTotalMarks" runat="server" CssClass="Label" Text='<%#Eval("Total_Mark") %>'></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="Marks Secured" ItemStyle-HorizontalAlign="Center">
                                <ItemTemplate>
                                    <asp:Label ID="lblMarksSecured" runat="server" CssClass="Label" Text='<%#Eval("Total_Mark") %>'></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>
                        </Columns>

and my code behind is like

var query = (from a in TraningScheduleDetails
                         from b in TraningAnshwerSheet
                         from c in TraningAnshwerSheetDetails
                         from d in EmpProfessionalDetails
                         from e in EmpProfessionalJobDetails
                         from f in Department
                         from g in Designation
                         where a.TrainingScheduleDetailId == int.Parse(ddlExamDate.SelectedValue)
                         && a.TrainingScheduleDetailId == b.TrainingScheduleDetailId
                         && b.TrainingAnswerSheetId == c.TrainingAnswerSheetId
                         && b.EmployeeProfessionalDetailId == d.EmployeeProfessionalDetailId
                         && d.EmployeeProfessionalDetailId == e.EmployeeProfessionalDetailId
                         && e.DepartmentId == f.DepartmentId
                         && e.DesignationId == g.DesignationId
                         select new
                         {
                             b.EmployeeProfessionalDetailId,
                             Name = d.FirstName + " " + d.MiddleName + " " + d.LastName,
                             d.EmployeeCode,
                             f.DepartmentName,
                             g.DesignationName,
                             Total_Mark = total_Mark,
                         }).ToList();
            var query2=(from a in query group a by a.EmployeeProfessionalDetailId into b
                        select new
                        {
                            EmpId=b.Key,                            
                            Name=b.Select(c =>c.Name),
                            EmpCode=b.Select(c=>c.EmployeeCode),
                            DeptName=b.Select(c=>c.DepartmentName),
                            DesigName=b.Select(c=>c.DesignationName),
                            Total_Mark=b.Select(c=>c.Total_Mark),                            
                        }).ToList();           
            grdEmployeeDetails.DataSource = query2;
            grdEmployeeDetails.DataBind();

please help.