Let's make a new project from scratch. Go to File | New | Web Site...; then, go to Solution Explorer and click on Default.aspx.
We can now see a basic HTML. Let's place a FileUpload control into it. To do this, go to Toolbox, grab a FileUpload control, and drag and drop it below the line that begins with <form id=..., and add a <br/> tag to it, as follows:
<asp:FileUploadID ="FileUpload1" runat="server" /><br/>
Next, let's put in a button underneath this line, as follows:
<asp:Button ID="Button1" runat="server" Text="Upload" /><br />
Change the text on the button so that it says something more meaningful, such as Upload.
Delete the two <div> lines—you won't need them.
When you go to the Design view, you have this simple interface...
