TextBox.LostFocus : TextBox « System.Windows.Forms « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Windows.Forms
3. TextBox

TextBox.LostFocus

 


using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

    public class FocusForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.TextBox txtFocusForm;
        private System.Windows.Forms.Button btFocusForm;
        public FocusForm()
        {
            this.txtFocusForm = new System.Windows.Forms.TextBox();
            this.btFocusForm = new System.Windows.Forms.Button();
            this.SuspendLayout();
            this.txtFocusForm.Location = new System.Drawing.Point(8, 8);
            this.txtFocusForm.Size = new System.Drawing.Size(336, 20);
            this.txtFocusForm.LostFocus += new System.EventHandler(this.txtFocusForm_LostFocus);
            this.txtFocusForm.GotFocus += new System.EventHandler(this.txtFocusForm_GotFocus);

            this.btFocusForm.Location = new System.Drawing.Point(8, 40);
            this.btFocusForm.Size = new System.Drawing.Size(336, 23);
            this.btFocusForm.Text = "This button does nothing";
            this.btFocusForm.Click += new System.EventHandler(this.btFocusForm_Click);

            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(352, 70);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.btFocusForm,
                                                                          this.txtFocusForm});
            this.MaximizeBox = false;
            this.Name = "FocusForm";
            this.Text = "FocusForm";
            this.ResumeLayout(false);

        }
        static void Main() 
        {
            Application.Run(new FocusForm());
        }

        protected void txtFocusForm_LostFocus(object sender, EventArgs e)
        {
            // MessageBox.Show("Goodbye!");
        }

        protected void txtFocusForm_GotFocus(object sender, EventArgs e)
        {
            // MessageBox.Show("Hello!");
        }

        private void btFocusForm_Click(object sender, System.EventArgs e)
        {
            bool canFocus = txtFocusForm.CanFocus;
            bool containsFocus = this.ContainsFocus;
            bool focused = txtFocusForm.Focused;

            MessageBox.Show("Textbox can focus: " + canFocus +
                         "\nForm children contain focus: " + containsFocus +
                         "\nTextbox has focus: " + focused);

            txtFocusForm.Focus();
        }

        
    }


   
  

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