To abort the file uploading on the client-side, use the C1Upload.Abort client-side method, like the following:
1. Add a button named CancelButton to click to abort the uploading.
<asp:Button ID="CancelButton" runat="server" Text="Cancel" CssClass="C1ProgressButton" OnClientClick="CancelClicked();"/>
2. Create a function that calls the C1Upload.Abort method to abort the uploading once the cancel button has been clicked.
function CancelClicked() {
var uploadID = "<%= C1Upload1.ClientID %>";
var upload = $find(uploadID);
upload.abort();
}
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