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class Program
{
    static void Main(string[] args)
    {
        SaveFile("file.txt");
        Console.ReadLine();
    }
    public static void SaveFile(string fileName)
    {
        try
        {
            FileStream fs = new FileStream(fileName, FileMode.Create);
        }
        catch (Exception ex)
        {
            Console.WriteLine("File open error");
            throw new IOException();
        }
    }
}

[HandleProcessCorruptedStateExceptions]
public static void SaveFile(string fileName)
{
    try
    {
        FileStream fs = new FileStream(fileName, FileMode.Create);
    }
    catch (Exception ex)
    {
        Console.WriteLine("File open error");
        throw new IOException();
    }
}