Сижу на паре, ща буду сдавать) если коммитов дальлше нет - сдал

Cop_25/Controls/CustomListBox.cs

@@ -1,4 +1,5 @@
-using System;
+using Controls.Exceptions;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
@@ -41,9 +42,16 @@ namespace Controls
         /// </summary>
         public void SetTemplateString(string templateString, string startSymbol, string endSymbol)
         {
-            _templateString = templateString;
-            _startSymbol = startSymbol;
-            _endSymbol = endSymbol;
+            if (templateString != "" && startSymbol != "" && endSymbol != "")
+            {
+                _templateString = templateString;
+                _startSymbol = startSymbol;
+                _endSymbol = endSymbol;
+            }
+            else 
+            {
+                throw new ArgumentNullException("Вы не ввели все значения");
+            }
         }
 
         /// <summary>

Cop_25/Controls/CustomTextBoxNumber.Designer.cs

@@ -40,6 +40,8 @@
             textBoxNumber.Size = new Size(213, 27);
             textBoxNumber.TabIndex = 0;
             toolTipNumber.SetToolTip(textBoxNumber, "+79378811555");
+            textBoxNumber.Click += textBox_Enter;
+            textBoxNumber.Text = "+79991144333";
             // 
             // CustomNumberBox
             // 

Cop_25/Controls/CustomTextBoxNumber.cs

@@ -27,11 +27,6 @@ namespace Controls
         /// </summary>
         private string? _numberPattern;
 
-        /// <summary>
-        /// Шаблон вводимого значения
-        /// </summary>
-        private string? _numberExample = "+79991144333";
-
         /// <summary>
         /// Шаблон вводимого значения
         /// </summary>
@@ -107,13 +102,13 @@ namespace Controls
         }
 
         /// <summary>
-        /// Вывод подсказки с примером правильного ввода
+        /// Выведение подсказки на экран
         /// </summary>
         private void textBox_Enter(object sender, EventArgs e)
         {
             int visibleTime = 2000;
             ToolTip tooltip = new ToolTip();
-            tooltip.Show(_numberExample, textBoxNumber, 30, -20, visibleTime);
+            tooltip.Show("+79991144333", textBoxNumber, 30, -20, visibleTime);
         }
     }
 }

Cop_25/Forms/FormMain.Designer.cs

@@ -39,7 +39,6 @@
             buttonGetBro = new Button();
             toolTip = new ToolTip(components);
             button1 = new Button();
-            button2 = new Button();
             SuspendLayout();
             // 
             // customTextBoxNumber
@@ -54,7 +53,7 @@
             // 
             customComboBox.Location = new Point(2, 19);
             customComboBox.Name = "customComboBox";
-            customComboBox.SelectedItem = "";
+            customComboBox.SelectedItem = " ";
             customComboBox.Size = new Size(301, 188);
             customComboBox.TabIndex = 1;
             // 
@@ -109,7 +108,7 @@
             buttonGetBro.Name = "buttonGetBro";
             buttonGetBro.Size = new Size(273, 29);
             buttonGetBro.TabIndex = 7;
-            buttonGetBro.Text = "получить альтушку";
+            buttonGetBro.Text = "получить друга";
             buttonGetBro.UseVisualStyleBackColor = true;
             buttonGetBro.Click += buttonGetObject_Click;
             // 
@@ -127,22 +126,11 @@
             button1.UseVisualStyleBackColor = true;
             button1.Click += buttonAdd_Click;
             // 
-            // button2
-            // 
-            button2.Location = new Point(143, 119);
-            button2.Name = "button2";
-            button2.Size = new Size(94, 29);
-            button2.TabIndex = 9;
-            button2.Text = "очистить";
-            button2.UseVisualStyleBackColor = true;
-            button2.Click += buttonClear_Click;
-            // 
             // FormMain
             // 
             AutoScaleDimensions = new SizeF(8F, 20F);
             AutoScaleMode = AutoScaleMode.Font;
             ClientSize = new Size(800, 450);
-            Controls.Add(button2);
             Controls.Add(button1);
             Controls.Add(buttonGetBro);
             Controls.Add(buttonValidate);
@@ -170,6 +158,5 @@
         private Button buttonGetBro;
         private ToolTip toolTip;
         private Button button1;
-        private Button button2;
     }
 }

Cop_25/Forms/FormMain.cs

@@ -19,12 +19,13 @@ namespace Forms
             InitializeComponent();
             customComboBox.ComboBoxItems.Add("aboba1");
             customComboBox.ComboBoxItems.Add("aboba2");
+            customComboBox.SelectedItem = "aboba1";
 
             customTextBoxNumber.NumPattern = @"^\+7\d{10}$";
 
             customListBox.SetTemplateString("Имя: {FirstName}, Фамилия: {LastName}, Возраст: {Age}", "{", "}");
             Person person1 = new Person { FirstName = "{Лена}", LastName = "{Пряникова}", Age = "{18}" };
-            Person person2 = new Person { FirstName = "{Ева}", LastName = "{Конфетковна}", Age = "{20}" };
+            Person person2 = new Person { FirstName = "{Сергей}", LastName = "{Конфеткович}", Age = "{20}" };
             customListBox.FillProperty(person1, 0, "FirstName");
             customListBox.FillProperty(person1, 0, "LastName");
             customListBox.FillProperty(person1, 0, "Age");
@@ -51,7 +52,7 @@ namespace Forms
             try
             {
                 Person selectedPerson = customListBox.GetObjectFromStr<Person>();
-                MessageBox.Show($"Имя:  {selectedPerson.FirstName}, Фамилия: {selectedPerson.LastName}, Возраст: {selectedPerson.Age}");
+                MessageBox.Show($"Ваш друг. Имя:  {selectedPerson.FirstName}, Фамилия: {selectedPerson.LastName}, Возраст: {selectedPerson.Age}");
             }
             catch (Exception ex)
             {
@@ -59,11 +60,6 @@ namespace Forms
             }
         }
 
-        private void buttonClear_Click(object sender, EventArgs e) {
-            customComboBox.ComboBoxClear();
-
-        }
-
         private void buttonAdd_Click(object sender, EventArgs e)
         {
             customComboBox.ComboBoxItems.Add("abobaSECRET");