How to Write to a Text File C Programming GuideThese examples show various ways to write text to a file. The first two examples use static convenience methods on the System. IO. File class to write each element of any IEnumerablelt string and a string to a text file. Example 3 shows how to add text to a file when you have to process each line individually as you write to the file. Examples 1 3 overwrite all existing content in the file, but example 4 shows you how to append text to an existing file. These examples all write string literals to files, but more likely you will want to use the Format method, which has many controls for writing different types of values right or left justified in a field, with or without padding, and so on. You can also use the C string interpolation feature. F%2F+get+user-specified+file+or+directory+string+fileName+%3D.jpg' alt='Read File To String C#' title='Read File To String C#' />Exampleclass Write. Text. File. static void Main. These examples assume a C UsersPublicTest. Folder folder on your machine. You can modify the path if necessary. Example 1 Write an array of strings to a file. Create a string array that consists of three lines. First line, Second line, Third line. Write. All. Lines creates a file, writes a collection of strings to the file. You do NOT need to call Flush or Close. System. IO. File. Write. All. LinesC UsersPublicTest. Kerkythea Material Pack. FolderWrite. Lines. Example 2 Write one string to a text file. A class is the most powerful data type in C. Like a structure,. Write. All. Text creates a file, writes the specified string to the file. You do NOT need to call Flush or Close. System. IO. File. When Do Tafs Get Updated Flash here. Write. All. TextC UsersPublicTest. FolderWrite. Text. Example 3 Write only some strings in an array to a file. The using statement automatically flushes AND CLOSES the stream and calls. Read Text File C These examples show how to read whole text file into string, how to read all lines into string array or how to read text file line by line to. IDisposable. Dispose on the stream object. NOTE do not use File. Stream for text files because it writes bytes, but Stream. Writer. encodes the output as text. KB/files/570682/TestPdfFileWriter.png' alt='Read File To String C#' title='Read File To String C#' />In this article, we will try to read from an existing XML file using the XmlReader class. System. IO. Stream. Writer file. new System. IO. Stream. WriterC UsersPublicTest. FolderWrite. Lines. If the line doesnt contain the word Second, write the line to the file. ContainsSecond. Write. Lineline. Example 4 Append new text to an existing file. The using statement automatically flushes AND CLOSES the stream and calls. IDisposable. Dispose on the stream object. System. IO. Stream. Writer file. new System. IO. Stream. WriterC UsersPublicTest. FolderWrite. Lines. Write. LineFourth line. Output to Write. Lines. First line. Second line. Third line. Output to Write. Text. txt. A class is the most powerful data type in C. Like a structure, a class defines the data and behavior of the data type. Output to Write. Lines. Read File To String C#' title='Read File To String C#' />Here is the code to read a text file from disk one line at a time into a string. This code ensures the file exists and properly closes the file if an exception occurs. How to read and write a binary file in C and some of its applications. Writing files in. NET is useful in many scenarios. Are you sure that your configuration file web. If you publish your file. Example 3. First line. Third line. Output to Write. Lines. 2. txt after Example 4. First line. Third line. Fourth line. These examples all write string literals to files, but more likely you will want to use the Format method, which has many controls for writing different types of values right or left justified in a field, with or without padding, and so on. You can also use the C string interpolation feature. Robust Programming The following conditions may cause an exception The file exists and is read only. The path name may be too long. The disk may be full. See Also. C Programming Guide. File System and the Registry C Programming GuideSample Save a collection to Application Storage. How to write connection string in web. Each month, over 5. Stack Overflow to learn, share their knowledge, and build their careers. Join the worlds largest developer community.