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basetarget="_blank"
<asp:Button ID="Button2" runat="server" Text="Button" onclick="Button2_Click" />
Response.Clear();
Response.Charset = "utf-8";
Response.Buffer = true;
this.EnableViewState = false;
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("1.rar", System.Text.Encoding.UTF8));
Response.ContentType = "application/octet-stream";
Response.WriteFile(@"E:\1.rar");
Response.Flush();
Response.Close();
Response.End();
<a href="Test/temp.rar">TTTTT</a>