Test.txt contains two lines of text: Hello World!!

Open Test.txt in a text editor such as Notepad. This code creates a file that is named Test.txt on drive C. On the Debug menu, select Start to compile and to run the application. Sw.WriteLine('From the StreamWriter class') StreamWriter sw = new StreamWriter('C:\Test.txt') Pass the filepath and filename to the StreamWriter Constructor The WriteLine method writes a complete line of text to the text file.Īdd the following code to the Main method: try In a similar way to the StreamReader class, you can pass the path of a text file to the StreamWriter constructor to open the file automatically. The following code uses the StreamWriter class to open, to write, and to close the text file. The Console window displays the contents of the Sample.txt file： Hello world Continue to read until you reach end of fileĬonsole.WriteLine('Exception: ' + e.Message) Ĭonsole.WriteLine('Executing finally block.') StreamReader sr = new StreamReader('C:\Sample.txt')

Pass the file path and file name to the StreamReader constructor Select Visual C# Projects under Project Types, and then select Console Application under Templates.Īdd the following code at the beginning of the Class1.cs file: using System.IO Īdd the following code to the Main method: String line On the File menu, point to New, and then select Project. For more information, see StreamReader Class.Ĭreate a sample text file in Notepad. When the ReadLine method reaches the end of the file, it returns a null reference. The ReadLine method reads each line of text, and increments the file pointer to the next line as it reads. You can pass the path of a text file to the StreamReader constructor to open the file automatically. The following code uses the StreamReader class to open, to read, and to close the text file. The Write a text file (example 1) and the Write a text file (example 2) sections describe how to use the StreamWriter class to write text to a file. The Read a text file section of this article describes how to use the StreamReader class to read a text file. Original product version: Visual Studio Original KB number: 816149 Summary This article helps you read from and write to a text file by using Visual C#.

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