C# - Create A Server Control On Another ASPX File?

I am developing a C#/SQL ASP.NET web application in VS 2008. Currently, I am transferring control from one ASPX file to another:

if (uploadFile.PostedFile.ContentLength > 0)
{
inputfile = System.IO.File.ReadAllText(path);
Context.Items["Message"] = inputfile; //Page1
Server.Transfer("DataMatch.aspx"); //Page1
}

However, it fails on this Server.Transfer line after inserting runat="server"

in the DataMatch.aspx file to the Table element like so:

<table width="50%" id="tMain" runat="server">

But after making this a server control, I rebuilt it and now when I run this app it gives me exception:

Error executing child request for DataMatch.aspx

But I need this table to be a server control so I can make it invisible programmatically if a certain condition occurs. How else can I programmatically make this table invisible?