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copy

using System;
using System.Collections.Generic;
using System.IO;
using System.Drawing;
using System.Windows.Forms;
 
namespace TextRoll
{
static class Program
{
[STAThread]
static void Main()
{
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
}
}
public class Form1 : Form
{
RichTextBox log = new RichTextBox();
List<string> roll = new List<string>();
public Form1()
{
    log.Location = new Point(0, 0);
    this.AutoScaleDimensions = new SizeF(6F, 12F);
    this.AutoScaleMode = AutoScaleMode.Font;
    this.ClientSize = new System.Drawing.Size(800, 400);
    this.Controls.Add(log);
    log.Anchor = (AnchorStyles)(AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right);
    log.AllowDrop = true;
    log.DragEnter += _DragEnter;
    log.DragDrop += _DragDrop;
    log.Size = this.ClientSize;
}
private void _DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.None;
    if (!e.Data.GetDataPresent(DataFormats.FileDrop)) return;
    string[] fn = (string[])e.Data.GetData(DataFormats.FileDrop, false);
    if (fn.Length < 1) return;
    e.Effect = DragDropEffects.Copy;
}
private void _DragDrop(object sender, DragEventArgs e)
{
    string[] fn = (string[])e.Data.GetData(DataFormats.FileDrop, false);
    if (fn.Length < 1) return;
    using (StreamReader fs = new StreamReader(fn[0]))
    { while (fs.Peek() > -1) texroll(fs.ReadLine()); }
}
private void texroll(string st)
{
    roll.Add(st);
    if (roll.Count > 80) roll.RemoveAt(0);
    log.Text = string.Join("\n", roll.ToArray());
    Application.DoEvents();
}
}
}

prog.cs(5,22): error CS0234: The type or namespace name `Forms' does not exist in the namespace `System.Windows'. Are you missing `System.Windows.Forms' assembly reference?
prog.cs(19,22): error CS0246: The type or namespace name `Form' could not be found. Are you missing an assembly reference?
prog.cs(21,1): error CS0246: The type or namespace name `RichTextBox' could not be found. Are you missing an assembly reference?
prog.cs(36,40): error CS0246: The type or namespace name `DragEventArgs' could not be found. Are you missing an assembly reference?
prog.cs(44,39): error CS0246: The type or namespace name `DragEventArgs' could not be found. Are you missing an assembly reference?
Compilation failed: 5 error(s), 0 warnings

Standard output is empty