Вызов события TextChanged в TextBox по нажатию Enter

        private void Artikl_Filter_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                (sender as TextBox).TextChanged(sender, null);
            }
        }

    class TextBoxEnter : TextBox
    {
        public TextBoxEnter()
        {
            this.KeyDown += new KeyEventHandler((x, e) =>
            {
                 if (e.KeyCode == Keys.Enter) this.OnTextChanged(null);
            });
        }
    }

...
 
textBox1.KeyDown += (sndr, e) => if (e.KeyCode == Keys.Enter) textBox1_FinishEdit(sndr);
textBox1.lostFocus += (sndr, e) => textBox1_FinishEdit(sndr);
textBox1.TextChanged += (sndr, e) => allBox_StartEdit(sndr);
 
...
void allBox_StartEdit(object sender)
{
(sender as TextBox).Tag=false;
(sender as TextBox).BackColor = Color.Green;
}
 
bool allBox_FinishEdit(object sender)
{
if ((sender as TextBox).Tag != null)
if ((sender as TextBox).Tag is bool)
if (((sender as TextBox).Tag as object) == false)
{
(sender as TextBox).Tag = true;
(sender as TextBox).BackColor = Color.Whie;
return true;
}
return false;
}
 
void textBox1_FinishEdit(object  sender)
{
if(!allBox_FinishEdit(sender)) return;
 
//тут что-нибудь вроде:
SetSpecialValue((sender as TextBox).Text);
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.Common;
using System.Data.SqlClient;
 
namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            this.button1.Enabled = false;
 
            this.textBox1.Tag = false;
            this.textBox2.Tag = false;
            this.textBox3.Tag = false;
            this.textBox4.Tag = false;
            this.textBox5.Tag = false;
            this.textBox6.Tag = false;
            this.textBox7.Tag = false;
            this.textBox8.Tag = false;
            this.textBox9.Tag = false;
            this.textBox10.Tag = false;
 
            this.textBox1.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox2.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox3.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox4.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox5.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox6.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox7.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox8.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox9.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
            this.textBox10.Validating += new CancelEventHandler(this.txtBoxEmpty_Validating);
 
            this.textBox1.TextChanged += new EventHandler(txtBox_TextChanged);
            this.textBox2.TextChanged += new EventHandler(txtBox_TextChanged);
            this.textBox3.TextChanged += new
 EventHandler(txtBox_TextChanged);
            this.textBox4.TextChanged += new
            EventHandler(txtBox_TextChanged);
            this.textBox5.TextChanged += new
             EventHandler(txtBox_TextChanged);
            this.textBox6.TextChanged += new
            EventHandler(txtBox_TextChanged);
            this.textBox7.TextChanged += new
            EventHandler(txtBox_TextChanged);
            this.textBox8.TextChanged += new
            EventHandler(txtBox_TextChanged);
            this.textBox9.TextChanged += new
             EventHandler(txtBox_TextChanged);
            this.textBox10.TextChanged += new
            EventHandler(txtBox_TextChanged);
 
        }