Clear FileUpload filename

We can do this using javascript. Please refer below code sample

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<script type="text/javascript">
    function clearFileInputField(divId) {
        document.getElementById(divId).innerHTML = document.getElementById(tagId).innerHTML;
    }
</script>
    <asp:Label ID="Label1" runat="server"></asp:Label>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <div id="divFileUp3">
  <asp:FileUpload ID="fileUpload1" runat="server"   />
</div><asp:Button runat="server" Text="Remove" OnClientClick="clearFileInputField(divFileUp3)"/>
    </ContentTemplate>
    </asp:UpdatePanel>
</asp:Content>
 

Session timeout on shared hosted environments

Please refer this

Saving Changes Is Not Permitted On SQL Server 2008 Management Studio

To allow you to save changes after you alter table, do disable prevent changes:

1. Open Microsoft SQL Server Management Studio 2008
2. Click Tools, then click Options
3. Click Designers
4. Uncheck prevent saving changes that require table re-creation
5. Click OK
6. Try to alter your table