Read from a file in vb.net

ReadLines does not. However, for large files, using a Function like File. ReadLines becomes superior. The memory pressure is reduced.

Fewer garbage collections occur. For small files, though, the overhead of the enumerator may be more expensive. Also: Some programs require a String array for further processing. In these cases, using ReadAllLines is better. NET File. When a file is opened for reading or writing, it becomes a stream.

The stream is basically the sequence of bytes passing through the communication path. There are two main streams: the input stream and the output stream. The input stream is used for reading data from file read operation and the output stream is used for writing into the file write operation.

The System. IO namespace has various classes that are used for performing various operations with files, like creating and deleting files, reading from or writing to a file, closing a file, etc. The following table shows some commonly used non-abstract classes in the System. The FileStream class in the System. IO namespace helps in reading from, writing to and closing files. This class derives from the abstract class Stream. Lyndon R. Submitted by donbermoy on Thursday, February 6, - Net in how to read and write a file.

In this tutorial, we will learn how to manage data that is stored as a text file. Using text file is an easy way to manage data, although it is not as sophisticated as full fledged database management software such as SQL, Microsoft Access, and Oracle.

NET allows the user to create a text file, save the text file as well as read the text file. Reading and writing to a text file in VB. Net required the use of the StreamReader class and the StreamWriter class respectively. StreamReader is a tool that enables the streaming of data by moving it from one location to another so that it can be read by the user. There is not enough memory to write the string to buffer OutOfMemoryException.

The user lacks necessary permissions to view the path SecurityException. Do not make decisions about the contents of the file based on the name of the file. For example, the file Form1. Verify all inputs before using the data in your application. The contents of the file may not be what is expected, and methods to read from the file may fail. Skip to main content. This browser is no longer supported.