Are both buttons posting back? Unfortunately, the browser will upload the entire page in one chunk when you post. You

The only thing you can do is to use the AutoUploadOnPostBack property to disable automatic form submission, and call the SlickUpload_Submit() function in the onclick of your upload button. But that means that if a user selects a file, then clicks the other button instead of the upload button, they will loose the file they selected and have to choose it again. Will that work for your scenario?

Note: if you're using a asp:Button server control, with the OnClientClick property, it should read:

OnClientClick="SlickUpload_Submit();return false;"

so as to escape out of the ASP.NET submit code.