Foro de elhacker.net

public Form1()
        {
            InitializeComponent();
            textBox2.Enabled = false;
 
        }
 
        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked == true)
            {
                textBox2.Enabled = true;
            }
            else
            {
                textBox2.Enabled = false;
            }
        }

partial class Form1
 
    //...
 
    private void InitializeComponent()
    {
         //...
         this.checkBox1.CheckedChanged += new EventHandler(this.checkBox1_CheckedChanged);
         //...
     }
 
    //...
 
}

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
    textBox2.Enabled = ((CheckBox)sender).Checked;
}

No se puede encontrar el tipo o el nombre de espacio de nombres 'EventHandler' (¿falta una directiva using o una referencia de ensamblado?)

private void InitializeComponent()
        {
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
            this.button1 = new System.Windows.Forms.Button();
            this.folderBrowserDialog1 = new System.Windows.Forms.FolderBrowserDialog();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.button2 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.dataGridView1 = new System.Windows.Forms.DataGridView();
            this.checkBox1 = new System.Windows.Forms.CheckBox();
            this.checkBox1.CheckedChanged += new EventHandler(this.checkBox1_CheckedChanged);
            this.textBox2 = new System.Windows.Forms.TextBox();
            ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
            this.SuspendLayout();

using System;

this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged);