Within your application, you may want to determine whether the C1Uploader control is currently busy. You can determine whether a file is being uploaded or if C1Uploader has finished uploading files. To do so, use the IsBusy property. The code below determines whether the C1Uploader control is currently busy, and if not, uploads a new file.

To determine whether the uploader is busy:

If uploader.IsBusy = False Then
    uploader.AddFile("test.pdf", stream)
    uploader.BeginUploadFiles()
End If

if (uploader.IsBusy == false)
{
    uploader.AddFile("test.pdf", stream);
    uploader.BeginUploadFiles();
}

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