how to hide print button when pdf is opened in browser using asp.net

Question

protected void lnkView_Click(object sender, EventArgs e)

{

LinkButton lbkFile = (LinkButton)sender;

string FilePath = Server.MapPath("~/Uploads/Improvementdata/" + lbkFile.CommandArgument);

WebClient User = new WebClient();

Byte[] FileBuffer = User.DownloadData(FilePath);

if (FileBuffer != null)

{

string extn = Path.GetExtension(lbkFile.CommandArgument);

if (extn == ".jpg" || extn == ".png" || extn == ".JPG" || extn == ".jpg")

{

Response.ContentType = "image/jpeg";

Response.AddHeader("content-length", FileBuffer.Length.ToString());

Response.BinaryWrite(FileBuffer);

}

else

{

Response.ContentType = "application/pdf";

Response.AddHeader("content-length", FileBuffer.Length.ToString());

Response.BinaryWrite(FileBuffer);

}

}

}