![]() The path is not valid because it is Nothing ( ArgumentNullException).įile points to a path that does not exist ( FileNotFoundException or DirectoryNotFoundException). The path is not valid for one of the following reasons: it is a zero-length string, it contains only white space, it contains invalid characters, or it is a device path (starts with \\.\) ( ArgumentException). ![]() The following conditions may cause an exception: Dim inputString As String = "This is a test string." This example writes the string "This is a test string." to the file named Testfile.txt. ![]() Use the WriteAllText method, specifying the target file and string to be appended and setting the append parameter to True. The WriteAllText method can be used to append to a text file by specifying that the append parameter is set to True.
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