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Showing content from https://www.geeksforgeeks.org/c-sharp/console-seterror-method-in-c-sharp/ below:

Console.SetError() Method in C# - GeeksforGeeks

Last Updated : 11 Jul, 2025

The

sets the Error property of the specified StreamWriter i.e., it redirects the standard error stream to a file. As the console is set with this StreamWriter object, the WriteLine() method can be called to write the error into the file.

Syntax: public static void SetError (System.IO.StreamWriter newError); Parameter: newError: It is a stream which is the new standard error output.

This method will throw the

if the parameter passed is null. Also, since it uses the StreamWriter object, it's exceptions should also be taken care of.

In this example, the

is used to set the StreamWriter object to the console, and the error messages will be written into a log file from the Console.

// C# program to demonstrate 
// the SetError() method
using System;
using System.IO;

class GFG {

    // Main Method
    static void Main()
    {
        // Define file to receive error stream.
        string fn = "F:\\gfg_error.log";

        // Define the new error StreamWriter object
        StreamWriter errStream = new StreamWriter(fn);

        // Redirect standard error stream to file.
        Console.SetError(errStream);

        // Write the error message into the Log file
        Console.Error.WriteLine("Error line is written into the log file.");
        Console.Error.WriteLine("Keep coding geeks!");

        // Close redirected error stream.
        Console.Error.Close();
    }
}

The gfg_error.log file will now have the error messages in it.

• https://learn.microsoft.com/en-us/dotnet/api/system.console.seterror?view=netframework-4.7.2#System_Console_SetError_System_IO_TextWriter_

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