Opening MS Word Document in asp.net

Question

Hi,
My web page contains two button i.e
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<asp:button id="btnOpenword" runat="server" text="OpenFile">
<asp:button id="btnNext" runat="server" text="Next" visible="false">

when i click on the OpenFile Button i need to open the word document and also below the Next button should visible to the user.
so i write some code but it's working to open the word document, but it's not visible the Next button to the user.
Collapse | Copy Code
btnNext.Visible = true;
FileInfo file = new FileInfo("filename.doc");
Response.ClearContent();
Response.AddHeader("Content-Disposition", "inline;filename=" + file.Name);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/msword";
Response.TransmitFile(file.FullName);
Response.End();

Plese give me solution it's urgent.
Thanks ,
Suresh