Read this popular Ebook by Masroor Aurangabadi on Rekhta.
www.rekhta.org
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************** Exception Text **************
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'startIndex')
at System.Globalization.CompareInfo.IndexOf(String source, String value, Int32 startIndex, Int32 count, CompareOptions options)
at System.String.IndexOf(String value, Int32 startIndex, Int32 count, StringComparison comparisonType)
at rekhta_downloader_winform.downloader.Book.DownloadBook(String outputPath) in D:\rekhta-downloader\rekhta-downloader-winform\rekhta-downloader-winform\downloader\Book.cs:line 52
at rekhta_downloader_winform.downloader.BookExporter.DownloadBook(String bookUrl, Int32 taskCount, OutputType output, String outputPath, CancellationToken token) in D:\rekhta-downloader\rekhta-downloader-winform\rekhta-downloader-winform\downloader\BookExporter.cs:line 31
at rekhta_downloader_winform.Form1.downloadBook() in D:\rekhta-downloader\rekhta-downloader-winform\rekhta-downloader-winform\Form1.cs:line 29
at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
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************** JIT Debugging **************