Visual Basic . NET programming for Beginners. The ability to open up a text file and read its contents can be very useful. You might have a text file containing quiz. You could read the questions and answers. Or you might want to save some data associated with your programme, and. Well see how to open up a text. VB . NET right now. In a later section, you'll learn how to save data. Reading Text files with proper encoding and byte order marks can be a bit of a pain when using a StreamReader as there's no detection. Rick Strahl's Web Log. This article demonstrates different ways to create a text file in C#. How to read file and dispose streamReader object. Or in C#: var objReader = new StreamReader. Not sure how this will behave with an already open file. Input and Output: File System Information, Reading, Writing. I want to read a text file which is already open with another program. FileStream theFile = File.Open(@'c. FileStream Open File . To open file create instance of FileStream class with FileMode and FileAccess. To open up a text file, you need to create something called a . The Stream. Reader is an object. System. IO. This applies for all the code in this text files section.) You create. Stream. Reader like this: Dim FILE. Does StreamReader need exclusive access to the file? C# / C Sharp Forums on Bytes. I haven't found any info about how to set a flag to tell StreamReader to open the file in shared mode and read mode. Gets the string representing the extension part of the file. FullName (inherited from System.IO.FileSystemInfo). The file is already open. How to close a Text File which is already OPEN in Windows from VB Program. Archived Forums V > Visual Basic Language. We store the. path and name of our text file inside of the string variable: = . But we're setting up this variable differently: Dim obj. Reader As New System. IO. Stream. Reader(. FILE. IO is an object within System. And. Stream. Reader is an object within IO. Stream. Reader needs the name of a file to Read. This goes between a pair of. System. IO. Stream. Reader( FILE. So. Integer variable, you are assigning a Stream. Reader. to a variable. Read To End. But this won't do you any good. We haven't actually opened the text file yet. You. do the opening like this: Text. Box. 1. Text = obj. Reader. Read. To. End. Now that obj. Reader is an object variable, it has its own properties and methods. Text property). One of the Methods available to our new Stream. Reader variable is the Read. To. End. method. This will read the whole of your text, right to the end. We're then. popping this in a textbox. Let's test all this theory out. Do the following: Start a new project Add a textbox to your new form, and just leave it on the default Name of. Textbox. 1Set its Multi. Line property to True Add a Button to your form. Double click the button and add the following code for it: Dim FILE. You have to close your stream. When you’re done, run your programme and click your Button. Unless you already have a file called test. You may see this error message. Visual Studio you have.)The last line spells it out clearly: Could not find file . If it does, you can open it. Amend your code to this (the new lines. Dim FILE. The first line of the If. Statement is this: If System. IO. File. Exists( FILE. Again, you start with System. IO. This has. a method called Exists. In between the round brackets, you type the name. The value returned will either. True (if it does exists), or False (if it doesn't). If the file exist then we can go ahead and create our Stream. Reader; If it doesn't. So that your programme will work, there is a file below called . Click the button once more.
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