ExportControl

ExportControl.aspx.cs

using System;
using System.IO;
using System.Web;
using Sitecore.IO;
using Sitecore.Form.Core.Utility;

namespace MyProject
{
	public partial class ExportBinary : System.Web.UI.Page
	{
		protected void Page_Load(object sender, EventArgs e)
		{			
			var text = Session["exportcontent"] as byte[]; //may need to change depending on the type of file
			var filename = Session["filename"] as string;
			if (string.IsNullOrEmpty(filename) || text == null || text.Length.Equals(0))
				return;
			Sitecore.Diagnostics.Log.Info(string.Format("Exporting my custom file {0}", filename), this);
			var tempFileName = WebUtil.GetTempFileName();
			File.WriteAllBytes(tempFileName, text); //may need to change depending on the type of file
			var fileSize = FileUtil.GetFileSize(tempFileName);
			WriteCacheHeaders(filename, fileSize);
			Response.TransmitFile(tempFileName, 0L, fileSize);
			Response.End();
		}

		private void WriteCacheHeaders(string filename, long length)
		{
			HttpResponse response = HttpContext.Current.Response;
			response.ClearHeaders();
			response.AddHeader("Content-Type", (string)Session["contentType"] ?? "application/octet-stream");
			response.AddHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
			response.AddHeader("Content-Length", length.ToString());
			response.Cache.SetNoStore();
		}
	}
}