I need to upgrade ASP.net 2.0 to 3.5 ----> i have done as instructed to use tool management, but when I run my files I get the following error
Server Error in '/' Application.
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Unknown server tag 'asp:ScriptManager'.
Line 28: AbCon Manufacturing!</h1>
Line 29: <p class="style1">
Line 30: <asp:ScriptManager ID="ScriptManager1" runat="server">
Line 31: </asp:ScriptManager>
Line 32: </p>
Source File: /MasterPage.master Line: 30
Version Information: Microsoft .NET Framework Version:2.0.50727.4016; ASP.NET Version:2.0.50727.4016