The file is in use by another process, or an I/O error occurs (xref:System.IO.IOException). The path is not valid because it is Nothing (xref:System.ArgumentNullException).įile points to a path that does not exist (xref:System.IO.FileNotFoundException or xref:System.IO.DirectoryNotFoundException). The path is not valid for one of the following reasons: it is a zero-length string it contains only white space or it contains invalid characters. The following conditions may create an exception: This example appends the data array CustomerData to the file named CollectedData.dat. Use the WriteAllBytes method, supplying the file path and name and the bytes to be written. If the path is valid but the file does not exist, the file will be created. If the specified path excluding the file name is not valid, a xref:System.IO.DirectoryNotFoundException exception will be thrown. If the append parameter is True, it will append the data to the file otherwise data in the file is overwritten. The xref.WriteAllBytes%2A method writes data to a binary file. How to: Write to Binary Files in Visual Basic
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