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    <p>My situation:</p> <p>I had a long running excel file loaded from sql data and I wanted update progress panel to display the spinner gif while the file was created and then download the file from within the update panel. It was trickier than I thought.</p> <p>This link came up high on searches and after trying to avoid it, it turned out that an iframe was useful to me.</p> <p><a href="http://encosia.com/ajax-file-downloads-and-iframes/" rel="nofollow">iframe async download</a></p> <p>Here is what ended up working.. (this exact code has not been tested)</p> <p>MyPage.aspx...(inside update panel, no triggers)</p> <pre><code>&lt;asp:Button runat="server" ID="btnExcelExport" Text="Export to Excel" OnClick="btnExcelExport_Click" /&gt; &lt;iframe runat="server" id="ifmExcel" width="0" height="0" marginheight="0" marginwidth="0" frameborder="0" /&gt; </code></pre> <p>MyPage.aspx.cs</p> <pre><code> protected void btnExcelExport_Click(object sender, EventArgs e) { //long running process here, taking advantage of the update progress panel var bytes = GetExcelFile(); //generate a key to pass to the download page to access the file bytes var cacheKey = Guid.NewGuid().ToString("N");//N means no hyphens //placing the result in cache for a few seconds so the download page can grab it Context.Cache.Insert(key: cacheKey, value: bytes, dependencies: null, absoluteExpiration: DateTime.Now.AddSeconds(30), slidingExpiration: System.Web.Caching.Cache.NoSlidingExpiration); ifmExcel.Attributes.Add("src", String.Format("MyDownloadPage.aspx?cacheKey={0}", cacheKey)); } </code></pre> <p>MyDownloadPage.aspx.cs...</p> <pre><code> protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { var bytes = Context.Cache.Get(Request.QueryString.Get("cacheKey")) as byte[]; Response.Clear(); Response.AddHeader( "content-disposition", string.Format("attachment; filename={0}.xlsx", "Invoice")); Response.ContentType = "application/xlsx"; Response.BinaryWrite(bytes); Response.End(); } } </code></pre> <p>It seems to work as expected like any other async post back would.</p>
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