C# TextBox Control

A TextBox control is used to display, or accept as input, a single line of text. This control has additional functionality that is not found in the standard Windows text box control, including multiline editing and password character masking.

A text box object is used to display text on a form or to get user input while a C# program is running. In a text box, a user can type data or paste it into the control from the clipboard.

For displaying a text in a TextBox control , you can code like this

  textBox1.Text = "http://csharp.net-informations.com";

You can also collect the input value from a TextBox control to a variable like this way

  string var;
  var = textBox1.Text;

When a program wants to prevent a user from changing the text that appears in a text box, the program can set the controls Read-only property is to True.

  textBox1.ReadOnly = true;

You can use the Multiline and ScrollBars properties to enable multiple lines of text to be displayed or entered.

  textBox1.Multiline = true;

TextBox controls can also be used to accept passwords and other sensitive information. You can use the PasswordChar property to mask characters entered in a single line version of the control

  textBox1.PasswordChar = '*';

The above code set the PasswordChar to * , so when the user enter password then it display only * instead of typed characters.

From the following C# source code you can see some important property settings to a TextBox control.

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Width = 250;
            textBox1.Height = 50;
            textBox1.Multiline = true;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string var;
            var = textBox1.Text;
            MessageBox.Show(var);
        }
    }
}