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Fix A table control was not found in the template for data list

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        #form1
        {
            width: 162px;
            height: 384px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
   <asp:DataList ID="DataList1" runat="server" DataKeyField="Sno" 
        DataSourceID="SqlDataSource1" CellPadding="0" ExtractTemplateRows="True">
        <ItemTemplate>
            Sno:
            <asp:Label ID="SnoLabel" runat="server" Text='<%# Eval("Sno") %>' />
            <br />
            name:
            <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
            <br />
            address:
            <asp:Label ID="addressLabel" runat="server" Text='<%# Eval("address") %>' />
            <br />
<br />
        </ItemTemplate>
    </asp:DataList>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
        DeleteCommand="DELETE FROM [User] WHERE [Sno] = @Sno" 
        InsertCommand="INSERT INTO [User] ([name], [address]) VALUES (@name, @address)" 
         SelectCommand="SELECT * FROM [User]" 
        UpdateCommand="UPDATE [User] SET [name] = @name, [address] = @address WHERE [Sno] = @Sno">
        <DeleteParameters>
            <asp:Parameter Name="Sno" Type="Int32" />
        </DeleteParameters>
        <InsertParameters>
            <asp:Parameter Name="name" Type="String" />
            <asp:Parameter Name="address" Type="String" />
        </InsertParameters>
        <UpdateParameters>
            <asp:Parameter Name="name" Type="String" />
            <asp:Parameter Name="address" Type="String" />
            <asp:Parameter Name="Sno" Type="Int32" />
        </UpdateParameters>
    </asp:SqlDataSource>
    <div>
    
    </div>
    </form>
</body>
</html>


solved code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        #form1
        {
            width: 162px;
            height: 384px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
  <asp:DataList ID="DataList1" runat="server" DataKeyField="Sno" 
        DataSourceID="SqlDataSource1" CellPadding="0" ExtractTemplateRows="False">
        <ItemTemplate>
            Sno:
            <asp:Label ID="SnoLabel" runat="server" Text='<%# Eval("Sno") %>' />
            <br />
            name:
            <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
            <br />
            address:
            <asp:Label ID="addressLabel" runat="server" Text='<%# Eval("address") %>' />
            <br />
<br />
        </ItemTemplate>
    </asp:DataList>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
        DeleteCommand="DELETE FROM [User] WHERE [Sno] = @Sno" 
        InsertCommand="INSERT INTO [User] ([name], [address]) VALUES (@name, @address)" 
         SelectCommand="SELECT * FROM [User]" 
        UpdateCommand="UPDATE [User] SET [name] = @name, [address] = @address WHERE [Sno] = @Sno">
        <DeleteParameters>
            <asp:Parameter Name="Sno" Type="Int32" />
        </DeleteParameters>
        <InsertParameters>
            <asp:Parameter Name="name" Type="String" />
            <asp:Parameter Name="address" Type="String" />
        </InsertParameters>
        <UpdateParameters>
            <asp:Parameter Name="name" Type="String" />
            <asp:Parameter Name="address" Type="String" />
            <asp:Parameter Name="Sno" Type="Int32" />
        </UpdateParameters>
    </asp:SqlDataSource>
    <div>
    
    </div>
    </form>
</body>
</html>

Solution of the problem

set ExtractTemplateRows="False" in data list, like
<asp:DataList ID="DataList1" runat="server" DataKeyField="Sno" 
        DataSourceID="SqlDataSource1" CellPadding="0" ExtractTemplateRows="False">


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