.NET Framework Write to and read from StdErr stream Write to standard error output using Console
Example
var sourceFileName = "NonExistingFile";
try
{
System.IO.File.Copy(sourceFileName, "DestinationFile");
}
catch (Exception e)
{
var stdErr = Console.Error;
stdErr.WriteLine($"Failed to copy '{sourceFileName}': {e.Message}");
}
