Reads a single line from an open sequential file and assigns it to a String variable.
Assembly: Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)
The LineInput function is provided for backward compatibility and may affect performance. For non-legacy applications, the My.Computer.FileSystem object provides better performance. For more information, see File Access with Visual Basic.
Data read with LineInput is usually written to a file by using Print.
When reading from files, do not make decisions about the contents of a file based on the file name extension. For example, a file that is named Form1.vb may not be a Visual Basic source file.
The LineInput function reads from a file one character at a time until it encounters a carriage return (Chr(13)) or carriage return/line feed (Chr(13) + Chr(10)) sequence. Carriage return/line feed sequences are skipped instead of appended to the character string.
Reading from a file by using the LineInput function requires Read access from the FileIOPermissionAccess enumeration.
This example uses the LineInput function to read a line from a sequential file and assign it to a variable. This example assumes that TestFile is a text file that has several lines of sample data.