помогите

COP_7/DropDownList.cs

@@ -19,18 +19,11 @@ namespace Components
 
         public string SelectedItem
         {
-            get
+            get 
             {
-                if (ComboBox.Items.Count == 0)
-                {
-                    return " ";
-                }
-                if (ComboBox.SelectedItem == null)
-                {
-                    return " ";
-                }
-                return ComboBox.SelectedItem.ToString()!;
+                return ComboBox.SelectedItem?.ToString() ?? string.Empty;
             }
+
             set
             {
                 if (ComboBox.Items.Contains(value))
@@ -41,7 +34,6 @@ namespace Components
             }
         }
 
-
         public ComboBox.ObjectCollection ComboBoxItems
         {
             get { return ComboBox.Items; }
@@ -63,7 +55,7 @@ namespace Components
             }
         }
 
-        private void CustomComboBox_SelectedValueChanged(object sender, EventArgs e)
+        private void ComboBox_SelectedValueChanged(object sender, EventArgs e)
         {
             _onValueChangedEvent?.Invoke(sender, e);
         }

COP_7/ListBoxMany.cs

@@ -13,32 +13,14 @@ namespace Components
 {
     public partial class ListBoxMany : UserControl
     {
-        /// <summary>
-        /// Конструктор по умолчанию
-        /// </summary>
         public ListBoxMany()
         {
             InitializeComponent();
         }
-
-        /// <summary>
-        /// Макет
-        /// </summary>
         private string _templateString;
-
-        /// <summary>
-        /// Символ начала
-        /// </summary>
         private string _startSymbol;
-
-        /// <summary>
-        /// Символ конца
-        /// </summary>
         private string _endSymbol;
 
-        /// <summary>
-        /// Шаблон строки
-        /// </summary>
         public void SetTemplateString(string templateString, string startSymbol, string endSymbol)
         {
             if (templateString != "" && startSymbol != "" && endSymbol != "")
@@ -53,9 +35,6 @@ namespace Components
             }
         }
 
-        /// <summary>
-        /// Выбранная строка
-        /// </summary>
         public int SelectedIndex
         {
             get { return listBox.SelectedIndex; }
@@ -67,10 +46,6 @@ namespace Components
                 }
             }
         }
-
-        /// <summary>
-        /// Получение обхекта
-        /// </summary>
         public T GetObjectFromStr<T>() where T : class, new()
         {
             if (listBox.SelectedIndex == -1)
@@ -105,10 +80,6 @@ namespace Components
             }
             return curObject;
         }
-
-        /// <summary>
-        /// Заполнение
-        /// </summary>
         public void FillProperty<T>(T dataObject, int rowIndex, string propertyName)
         {
 

COP_7/TextBoxPhone.cs

@@ -14,31 +14,19 @@ namespace Components
 {
     public partial class TextBoxPhone : UserControl
     {
-        /// <summary>
-        /// Конструктор
-        /// </summary>
         public TextBoxPhone()
         {
             InitializeComponent();
         }
 
-        /// <summary>
-        /// Шаблон вводимого значения
-        /// </summary>
         private string? _phonePattern;
 
-        /// <summary>
-        /// Шаблон вводимого значения
-        /// </summary>
         public string? PhonePattern
         {
             get { return _phonePattern; }
             set { _phonePattern = value; }
         }
 
-        /// <summary>
-        /// Введенное значение
-        /// </summary>
         public string? PhoneTextBox
         {
             get
@@ -70,14 +58,8 @@ namespace Components
             }
         }
 
-        /// <summary>
-        /// Событие, вызываемое при смене значения
-        /// </summary>
         private EventHandler _onValueChangedEvent;
 
-        /// <summary>
-        /// Событие, вызываемое при смене значения
-        /// </summary>
         public event EventHandler ValueChanged
         {
             add
@@ -90,17 +72,12 @@ namespace Components
                 _onValueChangedEvent -= value;
             }
         }
-        /// <summary>
-        /// Смена значения
-        /// </summary>
-        private void CustomPhoneBox_PhoneChanged(object sender, EventArgs e)
+
+        private void PhoneBox_PhoneChanged(object sender, EventArgs e)
         {
             _onValueChangedEvent?.Invoke(sender, e);
         }
 
-        /// <summary>
-        /// Выведение подсказки на экран
-        /// </summary>
         private void textBox_Enter(object sender, EventArgs e)
         {
             int visibleTime = 2000;