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using System;
using System.Drawing;
using System.Windows.Forms;
namespace textboxact
{
static class Program
{
[STAThread]
static void Main()
{
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
}
}
public class Form1 : Form
{
TextBox Atex = new TextBox(), Btex=new TextBox();
public Form1()
{
    Atex.Location = new Point(15, 15);
    Atex.Multiline = true;
    Atex.Size = new Size(270, 110);
    Atex.WordWrap = false;
    //Atex.KeyDown += Atex_KeyDown;
    Atex.KeyPress += _KeyPress;
    Btex.Location = new System.Drawing.Point(15, 140);
    Btex.Multiline = true;
    Btex.Size = new Size(270, 110);
    Btex.WordWrap = false;
    this.AutoScaleDimensions = new SizeF(6F, 12F);
    this.ClientSize = new Size(300, 300);
    this.Controls.Add(Btex); this.Controls.Add(Atex);
    Atex.GotFocus += text_gotfocus;
    Atex.LostFocus += text_lostfocus;
    Btex.GotFocus += text_gotfocus;
    Btex.LostFocus += text_lostfocus;
}
private void text_gotfocus(object sender, EventArgs e)
{
    TextBox tb = sender as TextBox;
    if (null == tb) return;
    tb.BackColor = SystemColors.Window;
}
private void text_lostfocus(object sender, EventArgs e)
{
    TextBox tb = sender as TextBox;
    if (null == tb) return;
    tb.BackColor = Color.Red;
}
//private void Atex_KeyDown(object sender, KeyEventArgs e)
//{ e.SuppressKeyPress = true; Btex.Select(); }
private void _KeyPress(object sender, KeyPressEventArgs e)
{ e.Handled = true; Btex.Select(); }
}
}
 

prog.cs(3,22): 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(16,22): error CS0246: The type or namespace name `Form' could not be found. Are you missing an assembly reference?
prog.cs(18,1): error CS0246: The type or namespace name `TextBox' could not be found. Are you missing an assembly reference?
prog.cs(53,39): error CS0246: The type or namespace name `KeyPressEventArgs' could not be found. Are you missing an assembly reference?
Compilation failed: 4 error(s), 0 warnings

Standard output is empty