Why cant opened downloaded docx files ,in asp.net?
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I try to download a docx file from serverside.
What is my wrong ?

this is code :

     FileInfo file = new FileInfo(filepath);
            Response.Clear();
            Response.ClearHeaders();
            Response.ClearContent();
            Response.AppendHeader("Content-Disposition", "attachment; filename = " + ((Button)sender).CommandName + ".docx");
            Response.AppendHeader("Content-Length", file.Length.ToString());
            Response.ContentType = "application/octet-stream";
            Response.WriteFile(file.FullName);
            Response.Flush();
            Response.Close();
            Response.End();