Question

On an ASP.NET page, if the ASP.NET elements like <asp:Texbox ID="Textbox1"> appears in more than one place, are they the same Textbox object or are they different objects with the same name "Textbox1"? If the same, "why won’t it cause any conflicts?"

E.G.

<asp:DetailsView 
        ID="DetailsView1" runat="server" AutoGenerateRows="False" CellPadding="4" 
        DataKeyNames="CategoryID" DataSourceID="SqlDataSource1" DefaultMode="Insert" 
        ForeColor="#333333" GridLines="None" Height="50px" Width="125px">
        <AlternatingRowStyle BackColor="White" />
        <CommandRowStyle BackColor="#D1DDF1" Font-Bold="True" />
        <EditRowStyle BackColor="#2461BF" />
        <FieldHeaderStyle BackColor="#DEE8F5" Font-Bold="True" />
        <Fields>
            <asp:TemplateField HeaderText="Name" SortExpression="Name">
                <EditItemTemplate>
                    **<asp:TextBox ID="TextBox1"** runat="server" Text='<%# Bind("Name") %>'></asp:TextBox>
                </EditItemTemplate>
                <InsertItemTemplate>
                    **<asp:TextBox ID="TextBox1"** runat="server" Text='<%# Bind("Name") %>'></asp:TextBox>
                    <span class="style6">
                    <br />
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
                        ControlToValidate="TextBox1" Display="Dynamic" 
                        ErrorMessage="RequiredFieldValidator" ValidationGroup="A"></asp:RequiredFieldValidator>
                    </span>
                </InsertItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("Name") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:CommandField CancelText="" ShowInsertButton="True" ValidationGroup="A" />
        </Fields>
        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#EFF3FB" />
    </asp:DetailsView>

Answer 1

Declaring textbox controls inside other controls e.g. gridview control is declaring inside the object of the containning control, ie no longer declaring inside the aspx page object. Therefore the name can be identical.