using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using static System.Windows.Forms.VisualStyles.VisualStyleElement; namespace WindowsFormsApp1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { textBox1.Text = "*****"; } private void textBox1_TextChanged(object sender, EventArgs e) { } private void button2_Click(object sender, EventArgs e) { textBox1.Text = "+++++"; } private void button3_Click(object sender, EventArgs e) { textBox1.Text = "00000"; } } }