Получение значений из элементов управления .NET в список SharePoint

Пример демонстрации для сохранения данных в SharePoint с помощью CSOM.

<div>
            <asp:TextBox ID = "Field1" runat = "server"></asp:TextBox>
            <asp:DropDownList ID = "Field2" runat = "server">
                <asp:ListItem Text = "A" Value = "A"></asp:ListItem>
                <asp:ListItem Text = "B" Value = "B"></asp:ListItem>
                <asp:ListItem Text = "C" Value = "C"></asp:ListItem>
            </asp:DropDownList>
            <asp:CheckBox ID = "Field3" runat = "server"></asp:CheckBox>
        </div>
        <asp:Button ID = "Button1" OnClick = "btn_Save" runat = "server" Text = "Button" />


using (ClientContext clientContext = new ClientContext("http://sp:12001/"))
            {
                clientContext.Credentials = new NetworkCredential("lee","pw","domain");
                Web web = clientContext.Web;
                List oList = clientContext.Web.Lists.GetByTitle("MyList3");
                ListItemCreationInformation itemCreateInfo = new ListItemCreationInformation();
                Microsoft.SharePoint.Client.ListItem oListItem = oList.AddItem(itemCreateInfo);
                oListItem["Title"] = Field1.Text;
                oListItem["Field2"] = Field2.SelectedItem.Value;
                oListItem["Field3"] = Field3.Checked;
                oListItem.Update();

                clientContext.ExecuteQuery();
            }