ASP.NET UpdatePanel Time Out
There is a property on the ScriptManager which allows you to set the time-out in seconds. The default value is 90 seconds.
AsyncPostBackTimeout="300"
In my case the ScriptManager object was created in a Master Page file that was then shared with the Content Page files. So to change the ScriptManager.AsyncPostBackTimeout property in the Content Page, I had to access the object in the Content Page's aspx.cs file:
protected void Page_Load(object sender, EventArgs e){ . . . ScriptManager _scriptMan = ScriptManager.GetCurrent(this); _scriptMan.AsyncPostBackTimeout = 36000;}
This did the trick (basically just ignoring all timeouts):
<script type="text/javascript"> Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function (sender, args) { if (args.get_error() && args.get_error().name === 'Sys.WebForms.PageRequestManagerTimeoutException') { args.set_errorHandled(true); } }); </script>