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StreamWriter.WriteLineAsync Method (Char)

.NET Framework 4.6 and 4.5

Writes a character followed by a line terminator asynchronously to the stream.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public override Task WriteLineAsync(
	char value


Type: System.Char

The character to write to the stream.

Return Value

Type: System.Threading.Tasks.Task

A task that represents the asynchronous write operation.

Exception Condition

The stream writer is disposed.


The stream writer is currently in use by a previous write operation.

The line terminator is defined by the TextWriter.NewLine property.

The following example shows how to write a single character (the letter "a") to a line in a text file, followed by another line that contains a single character (the letter "b"), by using the WriteLineAsync(Char) method.

using System;
using System.IO;

namespace ConsoleApplication
    class Program
        static void Main(string[] args)

        static async void WriteCharacters()
            using (StreamWriter writer = File.CreateText("newfile.txt"))
                await writer.WriteLineAsync('a');
                await writer.WriteLineAsync('b');

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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