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Form1_Lab1.cs

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+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";
+        }
+
+    }
+}