Ошибка изменения коллекции во время databind

Question

Получение ошибки сервера в приложении «/».

The control collection cannot be modified during Databind, Init, Load, PreRender or Unload phases. 
    Line 113: if (cbShowDiscontinued.Checked) 
    Line 114: { 
    Line 115:  gvProducts.DataSourceID=dsDiscountinuedProducts.ID); 
    Line 116: } 
    Line 117: else 

говорит, что ошибка указана в строке 115, но я не понимаю, почему. Я попытался пройти все мои строки SQL-соединения и удостоверился, что все необходимое

Я попытался изменить несколько вещей, но безрезультатно.
Ниже приведен мой код и код. Мы работаем с локальной базой данных.

<%@ Page Title="WGProductsCRUD" Language="C#"  

    MasterPageFile="~/WF2Master.master" AutoEventWireup="true"  

    CodeFile="WGProductsCRUD.aspx.cs" Inherits="WGProductsCRUD" %> 

    <asp:Content ID="Content1" ContentPlaceHolderID="cphHead" runat="Server"> 
    </asp:Content> 
    <asp:Content ID="Content2" ContentPlaceHolderID="cphMain" runat="Server"> 
    <h2>WG Products CRUD</h2> 


    <asp:MultiView ID="mvProducts" runat="server" ActiveViewIndex="0"> 
     <asp:View ID="vwMaster" runat="server"> 
    <asp:GridView ID="gvProducts" runat="server" AllowPaging="True" 

    AllowSorting="True" AutoGenerateColumns="False" 

    DataSourceID="dsActiveProducts" DataKeyNames="ProdId"> 
     <Columns> 
      <asp:CommandField ShowSelectButton="True" /> 
      <asp:BoundField DataField="ProdName" HeaderText="Products" 

    SortExpression="ProdName" /> 
      <asp:BoundField DataField="Price" DataFormatString="{0:c}" 

    HeaderText="Price" SortExpression="Price" /> 
      <asp:BoundField DataField="ProductStatusName" HeaderText="Status" 

    SortExpression="ProductStatusName" /> 
      <asp:BoundField DataField="CategoryName" HeaderText="Category"  

    SortExpression="CategoryName" /> 
      <asp:TemplateField ShowHeader="False"> 
       <ItemTemplate> 
        <asp:LinkButton ID="LinkButton1" runat="server"  

    CausesValidation="False" CommandName="Delete" OnClientClick="return 

    confirm('Are you sure?')" OnPreRender="cbShowDiscontinued_CheckedChanged" 

    Text='<%# Eval("ButtonText") %>'></asp:LinkButton> 
       </ItemTemplate> 
      </asp:TemplateField> 
     </Columns> 
    </asp:GridView> 

    <asp:SqlDataSource ID="dsActiveProducts" runat="server" 
     ConnectionString="<%$ ConnectionStrings:WGConString %>" 
     DeleteCommand="UPDATE [WGProducts] SET ProdStatusId=4 WHERE [ProdId] 

    = 

    @ProdId" 
     InsertCommand="INSERT INTO [WGProducts] ([ProdName], [Price]) VALUES 

    (@ProdName, @Price)" 
     SelectCommand="SELECT WGProducts.ProdId, WGProducts.ProdName, 

    WGProducts.Price, WGCategories.CategoryId, 

    WGProductStatuses.ProductStatusName, WGCategories.CategoryName, 

'Deactivate' 

    AS ButtonText FROM WGProducts LEFT OUTER JOIN WGCategories ON 

    WGProducts.ProdCategoryId = WGCategories.CategoryId LEFT OUTER JOIN 

    WGProductStatuses ON WGProducts.ProdStatusId = 

    WGProductStatuses.ProductStatusId WHERE (WGProducts.ProdStatusId &lt; 

    @ProdStatusId) ORDER BY WGProducts.ProdName" 
     UpdateCommand="UPDATE [WGProducts] SET [ProdName] = @ProdName, 


[Price] = 

    @Price WHERE [ProdId] = @ProdId"> 
     <DeleteParameters> 
      <asp:Parameter Name="ProdId" Type="Int32" /> 
     </DeleteParameters> 
     <InsertParameters> 
      <asp:Parameter Name="ProdName" Type="String" /> 
      <asp:Parameter Name="Price" Type="Decimal" /> 
     </InsertParameters> 
     <SelectParameters> 
      <asp:Parameter DefaultValue="4" Name="ProdStatusId" Type="Int32" 

/> 
     </SelectParameters> 
     <UpdateParameters> 
      <asp:Parameter Name="ProdName" Type="String" /> 
      <asp:Parameter Name="Price" Type="Decimal" /> 
      <asp:Parameter Name="ProdId" Type="Int32" /> 
     </UpdateParameters> 
    </asp:SqlDataSource> 

    <asp:SqlDataSource ID="dsDiscontinuedProducts" runat="server" 

    ConnectionString="<%$ ConnectionStrings:WGConString %>" 

DeleteCommand="Update 

    [WGProducts] set ProdStatusId=1 WHERE [ProdId] = @ProdId"  

    InsertCommand="INSERT 

    INTO [WGProducts] ([ProdName], [Price]) VALUES (@ProdName, @Price)" 

    SelectCommand="SELECT WGProducts.ProdId, WGProducts.ProdName,  

    WGProducts.Price, 

    WGCategories.CategoryName, WGProductStatuses.ProductStatusName, 

'Reactivate' 

    AS 

    ButtonText FROM WGProducts LEFT OUTER JOIN WGProductStatuses ON 

    WGProducts.ProdStatusId = WGProductStatuses.ProductStatusId LEFT OUTER 

JOIN 

    WGCategories ON WGProducts.ProdCategoryId = WGCategories.CategoryId WHERE 

    (WGProducts.ProdStatusId = @ProdStatusId) ORDER BY WGProducts.ProdName" 

    UpdateCommand="UPDATE [WGProducts] SET [ProdName] = @ProdName, [Price] =  

    @Price 

    WHERE [ProdId] = @ProdId"> 
     <DeleteParameters> 
      <asp:Parameter Name="ProdId" Type="Int32" /> 
     </DeleteParameters> 
     <InsertParameters> 
      <asp:Parameter Name="ProdName" Type="String" /> 
      <asp:Parameter Name="Price" Type="Decimal" /> 
     </InsertParameters> 
     <SelectParameters> 
      <asp:Parameter DefaultValue="4" Name="ProdStatusId" Type="Int32" 

/> 
     </SelectParameters> 
     <UpdateParameters> 
      <asp:Parameter Name="ProdName" Type="String" /> 
      <asp:Parameter Name="Price" Type="Decimal" /> 
      <asp:Parameter Name="ProdId" Type="Int32" /> 
     </UpdateParameters> 
    </asp:SqlDataSource> 

    <asp:LinkButton ID="btnAddProduct" runat="server" 

    OnClick="btnAddProduct_Click">Add A Product</asp:LinkButton> 

     </asp:View> 

     <asp:View ID="vwDetails" runat="server" EnableViewState="False"> 
    <asp:DetailsView ID="dvSelectedProduct" runat="server" Height="50px" 

    Width="494px" AutoGenerateRows="False" DataKeyNames="ProdId" 

    DataSourceID="dsSelectedProduct"> 
     <Fields> 
      <asp:BoundField DataField="ProdId" HeaderText="Prod Id" 

    InsertVisible="False" ReadOnly="True" SortExpression="ProdId" /> 
      <asp:TemplateField HeaderText="Prod Name" 

SortExpression="ProdName"> 
       <EditItemTemplate> 
        <asp:TextBox ID="tbProductName" runat="server" Text='<%# 

    Bind("ProdName") %>'></asp:TextBox> 
        <asp:RequiredFieldValidator ID="rfvProduct" 

runat="server" 
         ControlToValidate="tbProductName" 
         ErrorMessage="*Required" 
         Font-Italic="True" 
         ForeColor="Red"></asp:RequiredFieldValidator> 
        &nbsp; 
       </EditItemTemplate> 
       <InsertItemTemplate> 
        <asp:TextBox ID="tbProductName" runat="server" Text='<%# 

    Bind("ProdName") %>'></asp:TextBox> 
        <asp:RequiredFieldValidator ID="rfvProduct" 

runat="server" 
         ControlToValidate="tbProductName" 
         ErrorMessage="*Required" 
         Font-Italic="True" 
         ForeColor="Red"></asp:RequiredFieldValidator> 
        &nbsp; 
       </InsertItemTemplate> 

       <ItemTemplate> 
        <asp:Label ID="Label2" runat="server" Text='<%# 

    Bind("ProdName") %>'></asp:Label> 
       </ItemTemplate> 
      </asp:TemplateField> 

      <asp:TemplateField HeaderText="Description" 

    SortExpression="Description"> 
       <EditItemTemplate> 
        <asp:TextBox ID="tbDescription" runat="server" 
         Text='<%# Bind("Description") %>' 
         Height="88px" 
         TextMode="MultiLine" 
         Width="183px"></asp:TextBox> 
       </EditItemTemplate> 

       <InsertItemTemplate> 
        <asp:TextBox ID="tbDescription" runat="server" 
         Text='<%# Bind("Description") %>' 
         Height="88px" 
         TextMode="MultiLine" 
         Width="183px"></asp:TextBox> 
       </InsertItemTemplate> 

       <ItemTemplate> 
        <asp:Label ID="Label1" runat="server" 
         Text='<%# Bind("Description") %>'></asp:Label> 
       </ItemTemplate> 

      </asp:TemplateField> 
      <asp:BoundField DataField="Price" DataFormatString="{0:c}" 

    HeaderText="Price" SortExpression="Price" /> 
      <asp:BoundField DataField="ModelNumber" HeaderText="Model Number" 

    SortExpression="ModelNumber" /> 
      <asp:TemplateField HeaderText="Prod Image" 

    SortExpression="ImageFileName"> 
       <EditItemTemplate> 
        <asp:FileUpload ID="fupProdImage" runat="server" /> 
        <%--The hidden field will help us reset the original  

image 

    being used if the user doesn't change the image--%> 
        <asp:HiddenField ID="hfOriginalImageName" runat="server" 

    Value='<%# Bind("ImageFileName") %>' /> 
       </EditItemTemplate> 

       <InsertItemTemplate> 
        <asp:FileUpload ID="fupProdImage" runat="server" /> 
        <%--No hidden field needed here--%> 
       </InsertItemTemplate> 
       <ItemTemplate> 

        <%--Replaced this with custom-databound image control--%> 
        <%--     <asp:Label ID="Label3" 

runat="server" 

    Text='<%# Bind("ImageFileName") %>'></asp:Label>--%> 
        <asp:Image ID="imgProductImage" runat="server" 
         Height="200px" 
         ImageUrl='<%# Eval("ImageFileName", 

    "~/Images/Products/{0}") %>' /> 
       </ItemTemplate> 
      </asp:TemplateField> 

      <asp:BoundField DataField="LastUpdate" 
       DataFormatString="{0:f}" 
       HeaderText="Last Update" 
       SortExpression="LastUpdate" /> 
      <asp:TemplateField HeaderText="Category Name" 
       SortExpression="CategoryName"> 
       <EditItemTemplate> 
        <asp:DropDownList ID="ddlCategoryName" runat="server" 
         AppendDataBoundItems="True" 
         DataSourceID="dsCategories" 
         DataTextField="CategoryName" 
         DataValueField="CategoryId" 
         SelectedValue='<%# Bind("ProdCategoryId") %>'> 
         <asp:ListItem 
          Value="">[--Make a Selection--]</asp:ListItem> 
        </asp:DropDownList> 
        <asp:SqlDataSource ID="dsCategories" runat="server" 
         ConnectionString="<%$ ConnectionStrings:WGConString  

%>" 
         SelectCommand="SELECT [CategoryId], [CategoryName] 

FROM 

    [WGCategories]"></asp:SqlDataSource> 
       </EditItemTemplate> 
       <InsertItemTemplate> 
        <asp:DropDownList ID="ddlCategoryName" runat="server" 
         AppendDataBoundItems="True" 
         DataSourceID="dsSelectedProduct" 
         DataTextField="CategoryName" 
         DataValueField="CategoryId" 
         SelectedValue='<%# Bind("ProdCategoryId") %>'> 
         <asp:ListItem 
          Value="">[--Make a Selection--]</asp:ListItem> 
        </asp:DropDownList> 
        <asp:SqlDataSource ID="dsCategories" runat="server" 
         ConnectionString="<%$ ConnectionStrings:WGConString 

%>" 
         SelectCommand="SELECT [CategoryId], [CategoryName] 

FROM 

    [WGCategories]"></asp:SqlDataSource> 

       </InsertItemTemplate> 
       <ItemTemplate> 
        <asp:Label ID="Label4" runat="server" Text='<%# 

    Bind("CategoryName") %>'></asp:Label> 
       </ItemTemplate> 
      </asp:TemplateField> 
      <asp:TemplateField HeaderText="Product Status Name" 
       SortExpression="ProductStatusName"> 
       <EditItemTemplate> 
        <asp:DropDownList ID="ddlProductStatusName" 

runat="server" 
         AppendDataBoundItems="True" 
         DataSourceID="dsProductStatus" 
         DataTextField="ProductStatusName" 
         DataValueField="ProductStatusId" 
         SelectedValue='<%# Bind("ProdStatusId") %>'> 
         <asp:ListItem Value="">[--Make a Selection--] 

    </asp:ListItem> 
        </asp:DropDownList> 
        <asp:RequiredFieldValidator ID="rfvProductStatusName" 

    runat="server" 
         ControlToValidate="ddlProductStatusName" 
         ErrorMessage="*Required" 
         Font-Italic="True" 
         ForeColor="Red"></asp:RequiredFieldValidator> 

        <asp:SqlDataSource ID="dsProductStatus" runat="server" 
         ConnectionString="<%$ ConnectionStrings:WGConString 

%>" 
         SelectCommand="SELECT [ProductStatusId], 

    [ProductStatusName] FROM [WGProductStatuses]"></asp:SqlDataSource> 
       </EditItemTemplate> 
       <InsertItemTemplate> 
        <asp:DropDownList ID="ddlProductStatusName" 

runat="server" 
         AppendDataBoundItems="True" 
         DataSourceID="dsProductStatus" 
         DataTextField="ProductStatusName" 
         DataValueField="ProductStatusId" 
         SelectedValue='<%# Bind("ProdStatusId") %>'> 
         <asp:ListItem Value="">[--Make a Selection--] 

    </asp:ListItem> 
        </asp:DropDownList> 
        <asp:SqlDataSource ID="dsProductStatus" runat="server" 
         ConnectionString="<%$ ConnectionStrings:WGConString 

%>" 
         SelectCommand="SELECT [ProductStatusId], 

    [ProductStatusName] FROM [WGProductStatuses]"></asp:SqlDataSource> 

        <asp:RequiredFieldValidator ID="rfvProductStatusName" 

    runat="server" 
         ControlToValidate="ddlProductStatusName" 
         ErrorMessage="*Required" 
         Font-Italic="True" 
         ForeColor="Red"></asp:RequiredFieldValidator> 
       </InsertItemTemplate> 
       <ItemTemplate> 
        <asp:Label ID="Label5" runat="server" Text='<%# 

    Bind("ProductStatusName") %>'></asp:Label> 
       </ItemTemplate> 
      </asp:TemplateField> 
      <asp:TemplateField HeaderText="Vendor Name" 

    SortExpression="VendorName"> 
       <EditItemTemplate> 
        <asp:DropDownList ID="ddlVendors" runat="server" 
         DataSourceID="dsVendors" 
         DataTextField="VendorName" 
         DataValueField="VendorId" AppendDataBoundItems="True" 

    SelectedValue='<%# Bind("ProdVendorId") %>'> 
         <asp:ListItem 
          Value="">[--Make a Selection--]</asp:ListItem> 
        </asp:DropDownList> 
        <asp:RequiredFieldValidator ID="rfvVendorName" 

runat="server" 
         ControlToValidate="ddlVendors" 
         ErrorMessage="*Required" 
         Font-Italic="True" 
         ForeColor="Red"></asp:RequiredFieldValidator> 
        <asp:SqlDataSource ID="dsVendors" runat="server" 
         ConnectionString="<%$ ConnectionStrings:WGConString 

%>" 
         SelectCommand="SELECT [VendorId], [VendorName] FROM 

    [WGVendors]"></asp:SqlDataSource> 
       </EditItemTemplate> 
       <InsertItemTemplate> 
        <asp:DropDownList ID="ddlVendors" runat="server" 
         DataSourceID="dsVendors" 
         DataTextField="VendorName" 
         DataValueField="VendorId" AppendDataBoundItems="True" 

    SelectedValue='<%# Bind("ProdVendorId") %>'> 
         <asp:ListItem Value="">[--Make a Selection--] 

    </asp:ListItem> 
        </asp:DropDownList> 
        <asp:RequiredFieldValidator ID="rfvVendorName" 

runat="server" 
         ControlToValidate="ddlVendors" 
         ErrorMessage="*Required" 
         Font-Italic="True" 
         ForeColor="Red"></asp:RequiredFieldValidator> 
        <asp:SqlDataSource ID="dsVendors" runat="server" 
         ConnectionString="<%$ ConnectionStrings:WGConString 

%>" 
         SelectCommand="SELECT [VendorId], [VendorName] FROM 

    [WGVendors]"></asp:SqlDataSource> 

       </InsertItemTemplate> 
       <ItemTemplate> 
        <asp:Label ID="Label6" runat="server" Text='<%# 

    Bind("VendorName") %>'></asp:Label> 
       </ItemTemplate> 
      </asp:TemplateField> 
      <asp:CommandField ShowEditButton="True" ShowInsertButton="True" 

/> 
     </Fields> 
    </asp:DetailsView> 

    <asp:SqlDataSource ID="dsSelectedProduct" runat="server" 

ConnectionString=" 

    <%$ ConnectionStrings:WGConString %>" DeleteCommand="DELETE FROM 

[WGProducts] 

    WHERE [ProdId] = @ProdId" InsertCommand="INSERT INTO [WGProducts] 

    ([ProdName], 

    [Description], [Price], [ModelNumber], [ImageFileName], [LastUpdate], 

    [ProdCategoryId], [ProdStatusId], [ProdVendorId]) VALUES (@ProdName, 

    @Description, @Price, @ModelNumber, @ImageFileName, @LastUpdate, 

    @ProdCategoryId, 

    @ProdStatusId, @ProdVendorId)" SelectCommand="SELECT WGProducts.ProdId, 

    WGProducts.ProdName, WGProducts.Description, WGProducts.Price, 

    WGProducts.ModelNumber, WGProducts.ImageFileName, WGProducts.LastUpdate, 

    WGProducts.ProdCategoryId, WGProducts.ProdStatusId, 

WGProducts.ProdVendorId, 

    WGCategories.CategoryName, WGVendors.VendorName, 

    WGProductStatuses.ProductStatusName FROM WGProducts LEFT OUTER JOIN  

    WGCategories 

    ON WGProducts.ProdCategoryId = WGCategories.CategoryId LEFT OUTER JOIN  

    WGVendors 

    ON WGProducts.ProdVendorId = WGVendors.VendorId LEFT OUTER JOIN 

    WGProductStatuses 

    ON WGProducts.ProdStatusId = WGProductStatuses.ProductStatusId WHERE 

    (WGProducts.ProdId = @ProdId)" UpdateCommand="UPDATE [WGProducts] SET 

    [ProdName] 

    = @ProdName, [Description] = @Description, [Price] = @Price, 

[ModelNumber] = 

    @ModelNumber, [ImageFileName] = @ImageFileName, [LastUpdate] = 

@LastUpdate, 

    [ProdCategoryId] = @ProdCategoryId, [ProdStatusId] = @ProdStatusId, 

    [ProdVendorId] = @ProdVendorId WHERE [ProdId] = @ProdId" 

    OnInserted="dsSelectedProduct_Inserted" 

    OnInserting="dsSelectedProduct_Inserting" 

    OnUpdated="dsSelectedProduct_Updated"  

    OnUpdating="dsSelectedProduct_Updating"> 
     <DeleteParameters> 
      <asp:Parameter Name="ProdId" Type="Int32" /> 
     </DeleteParameters> 
     <InsertParameters> 
      <asp:Parameter Name="ProdName" Type="String" /> 
      <asp:Parameter Name="Description" Type="String" /> 
      <asp:Parameter Name="Price" Type="Decimal" /> 
      <asp:Parameter Name="ModelNumber" Type="String" /> 
      <asp:Parameter Name="ImageFileName" Type="String" /> 
      <asp:Parameter Name="LastUpdate" Type="DateTime" /> 
      <asp:Parameter Name="ProdCategoryId" Type="Int32" /> 
      <asp:Parameter Name="ProdStatusId" Type="Int32" /> 
      <asp:Parameter Name="ProdVendorId" Type="Int32" /> 
     </InsertParameters> 
     <SelectParameters> 
      <asp:ControlParameter ControlID="gvProducts" Name="ProdId" 

    PropertyName="SelectedValue" Type="Int32" /> 
     </SelectParameters> 
     <UpdateParameters> 
      <asp:Parameter Name="ProdName" Type="String" /> 
      <asp:Parameter Name="Description" Type="String" /> 
      <asp:Parameter Name="Price" Type="Decimal" /> 
      <asp:Parameter Name="ModelNumber" Type="String" /> 
      <asp:Parameter Name="ImageFileName" Type="String" /> 
      <asp:Parameter Name="LastUpdate" Type="DateTime" /> 
      <asp:Parameter Name="ProdCategoryId" Type="Int32" /> 
      <asp:Parameter Name="ProdStatusId" Type="Int32" /> 
      <asp:Parameter Name="ProdVendorId" Type="Int32" /> 
      <asp:Parameter Name="ProdId" Type="Int32" /> 
     </UpdateParameters> 
    </asp:SqlDataSource> 

    <asp:LinkButton ID="btnBack" runat="server" OnClick="btnBack_Click">Go 

    Back</asp:LinkButton> 

     </asp:View> 

    </asp:MultiView> 
    <asp:CheckBox ID="cbShowDiscontinued" Text="Show discontinued products" 

    runat="server" AutoPostBack="True" Checked="True" 

    OnCheckedChanged="cbShowDiscontinued_CheckedChanged" /> 





    </asp:Content> 

    <%--<asp:Content ID="Content3" ContentPlaceHolderID="cphSidebar"  

    Runat="Server"> 

    </asp:Content>--%> 


**Below is the Code Behind:** 



    using System; 
    using System.Collections.Generic; 
    using System.Linq; 
    using System.Web; 
    using System.Web.UI; 
    using System.Web.UI.WebControls; 

    public partial class WGProductsCRUD : System.Web.UI.Page 
    { 
     protected void Page_Load(object sender, EventArgs e) 
    { 

    } 

    protected void btnSoftDelete_PreRender(object sender, EventArgs e) 
    { 
     #region ToDo: non-working prerender code to fix for dynamic button 

text 
     //Button btn=(Button)gvProducts.FindControl("btnSoftDelete"); 
     //btn.Text = "foo"; 
     #endregion 
    } 
    protected void dsSelectedProduct_Inserted(object sender,     
    SqlDataSourceStatusEventArgs e) 
    { 
     //re databind gridview 
     gvProducts.DataBind(); 
     //switch views 
     mvProducts.SetActiveView(vwMaster);//or mvProducts.ActiveViewIndex=0; 
    } 
    protected void dsSelectedProduct_Inserting(object sender,       
    SqlDataSourceCommandEventArgs e) 
    { 
     //handle file upload logic for an insert (new record) 
     FileUpload fupload = 
    (FileUpload)dvSelectedProduct.FindControl("fupProdImage"); 

     //locate the file that is needed inside the details view 
     string imageName = "NoImage.jpg"; 
     //if an image is provided, handle it and send filename to db 
     if (fupload.HasFile) 
     { 
      //get the image name from the fup 
      imageName = fupload.FileName; 
      //randomly generate the image file name to avoid overwriting 

files 
    with common file names from different users. Assign randomly generated 
    (GUID) unique names with correct extension (.jpg, .bmp, etc.) 

      //get extension of orig file 
      string ext = imageName.Substring(imageName.LastIndexOf(".")); 
      //this will find the . and grab everything after that- the 

extension 
    of the file. 

      //Guid it up! 
      imageName = Guid.NewGuid() + ext; 

      //save the file to the server 
      fupload.SaveAs(Server.MapPath("~/Images/Products/" + imageName)); 
     } 

     //after the if statement is done, save the file name string to the 
    database record in the correct column 
     e.Command.Parameters["@ImageFileName"].Value = imageName; 

    } 
    protected void dsSelectedProduct_Updated(object sender, 
    SqlDataSourceStatusEventArgs e) 
    { 
     //re databind grid view 
     gvProducts.DataBind(); 
     //switch views 
     mvProducts.SetActiveView(vwMaster); 
    } 

    protected void dsSelectedProduct_Updating(object sender, 
    SqlDataSourceCommandEventArgs e) 
    { 
     //handle file upload logic for updating an existing record 
     FileUpload fupload = 
    (FileUpload)dvSelectedProduct.FindControl("fupProdImage"); 

     //if an image is provided, handle it and send filename to db 
     if (fupload.HasFile) 
     { 
      //get the image name from the fup 
      string imageName = fupload.FileName; 
      //randomly generate the image file name to avoid overwriting 

files 
    with common file names from different users. Assign randomly generated 
    (GUID) unique names with correct extension (.jpg, .bmp, etc.) 

      //get extension of orig file 
      string ext = imageName.Substring(imageName.LastIndexOf(".")); 
      //this will find the . and grab everything after that- the 

extension 
    of the file. 

      //Guid it up! 
      imageName = Guid.NewGuid() + ext; 

      //save the file to the server 
      fupload.SaveAs(Server.MapPath("~/Images/Products/" + imageName)); 
      //save the file name string to the database record in the correct 
    column 

      e.Command.Parameters["@ImageFileName"].Value = imageName; 

     } 
     //hidden field is two-way bound and will send the existing filename 

back 
    with record being updated 
    } 
    protected void btnAddProduct_Click(object sender, EventArgs e) 
    { 
     //switch views 
     mvProducts.SetActiveView(vwDetails); 
     //set details view in insert mode 
     dvSelectedProduct.ChangeMode(DetailsViewMode.Insert); 
    } 
    protected void btnBack_Click(object sender, EventArgs e) 
    { 
     //switch views 
     mvProducts.SetActiveView(vwMaster); 
     //redatabind the gridview 
     gvProducts.DataBind(); 
     //just to be safe : set details view to read only mode 
     dvSelectedProduct.ChangeMode(DetailsViewMode.ReadOnly); 
    } 
    protected void cbShowDiscontinued_CheckedChanged(object sender, EventArgs 

e) 
    { 
     if (cbShowDiscontinued.Checked) 
     { 
      gvProducts.DataSourceID = dsDiscontinuedProducts.ID; 
     } 
     else 
     { 
      gvProducts.DataSourceID = dsActiveProducts.ID; 
     } 
     gvProducts.DataBind();//go get the data of either discontinued or 

active 
    products 
    } 

    } 

Answer 1

Снимите .id

if (cbShowDiscontinued.Checked) 
     { 
      gvProducts.DataSourceID = dsDiscontinuedProducts; 
     } 
     else 
     { 
      gvProducts.DataSourceID = dsActiveProducts; 
     }