Gets the content length of the files selected for upload.
An integer value specifying the total content length of the selected files.
Use the totalContentLength property to obtain the content length of all files selected for upload. To get the content length of the currently uploaded file, use the ASPxClientUploadControlUploadingProgressChangedEventArgs.currentFileContentLength property. The content length of the files that have already been uploaded can be obtained by using the ASPxClientUploadControlUploadingProgressChangedEventArgs.uploadedContentLength property.