aspnet46 modelbinding

aspnet46

<%--
    Web Forms page calling a select method to model bind to a list of students.
    The GridView uses Model Binding to bind to Student type in your app.
    To use Async Model Binding, mark your page with Async=True attribute.
    --%>

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" Async="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication226._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
    <asp:GridView runat="server" ID="studentsGrid"
        ItemType="ContosoUniversityModelBinding.Models.Student" DataKeyNames="StudentID"
        SelectMethod="studentsGrid_GetData"
        UpdateMethod="studentsGrid_UpdateItem"
        DeleteMethod="studentsGrid_DeleteItem"
        AutoGenerateEditButton="true"
        AutoGenerateDeleteButton="true"
        AllowSorting="true" AllowPaging="true" PageSize="4"
        AutoGenerateColumns="false">
        <Columns>
            <asp:DynamicField DataField="StudentID" />
            <asp:DynamicField DataField="LastName" />
            <asp:DynamicField DataField="FirstName" />
            <asp:DynamicField DataField="Year" />
            <asp:TemplateField HeaderText="Total Credits">
                <ItemTemplate>
                    <asp:Label Text="<%# Item.Enrollments.Sum(en => en.Course.Credits) %>"
                        runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <br />
    <br />

</asp:Content>

//Async method for Select
public async Task<SelectResult> studentsGrid_GetData(int startRowIndex, int maximumRows)
{
    SchoolContext db = new SchoolContext();
    var query = db.Students.Include(s => s.Enrollments.Select(e => e.Course));
    SelectResult result = new SelectResult(query.Count(),
        await query
        .SortBy("StudentID")
        .Skip(startRowIndex)
        .Take(maximumRows)
        .ToListAsync());
    return result;
}

Fixed. Thanks!