Добавьте файлы проекта.

demo26052026/UserControl1.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;
+
+namespace demo26052026
+{
+    public partial class UserControl1 : UserControl
+    {
+        Form form { get; set; }
+        public UserControl1(Form s)
+        {
+            form = s;
+            InitializeComponent();
+            foreach(Control control in this.Controls)
+            {
+                control.Click += pictureBox1_Click;
+            }
+        }
+
+        private void textBox4_TextChanged(object sender, EventArgs e)
+        {
+            
+        }
+
+        private void pictureBox1_Click(object sender, EventArgs e)
+        {
+            form.Hide();
+            Form2 form2 = new Form2(int.Parse(this.Name));
+            form2.ShowDialog();
+        }
+    }
+}