Tracing invalid postback or callback argument

Question

In my unhandled exception logging I see this error sporadically through the day on a given page. I don't have any controls that I create programmatically on the page or databind any buttons onto the page.

In my logging I grab the current handler which is where I know the page from and the stacktrace however the stacktrace doesn't give anything meaningful since it just says it boils down to Page.ProcessPostData.

Is there a way that I can log more meaningful data? Like perhaps what it got posted and what it expected to be posted?

I can never reproduce this anywhere.

Answer 1

you can see all of the request's form parameters like this:

if (System.Web.HttpContext.Current != null && System.Web.HttpContext.Current.Request != null) {
    foreach (string key in System.Web.HttpContext.Current.Request.Form.Keys) {
        if (key.IndexOf("__VIEWSTATE") == -1) {
            //key:   key
            //value: System.Web.HttpContext.Current.Request.Form[key]
        }
    }
}