try2

Library15Gerimovich/DefaultList.Designer.cs

@@ -1,6 +1,6 @@
 namespace Library15Gerimovich
 {
-    partial class DefoltList
+    partial class DefaultList
     {
         /// <summary> 
         /// Обязательная переменная конструктора.

Library15Gerimovich/DefaultList.cs

@@ -10,7 +10,7 @@ using System.Windows.Forms;
 
 namespace Library15Gerimovich
 {
-    public partial class DefoltList : UserControl
+    public partial class DefaultList : UserControl
     {
         public event EventHandler? SelectedValueChanged;
 
@@ -34,7 +34,7 @@ namespace Library15Gerimovich
             }
         }
 
-        public DefoltList()
+        public DefaultList()
         {
             InitializeComponent();
         }

Library15Gerimovich/Exceptions/EmptyValueException.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Library15Gerimovich.Exceptions
+{
+    public class EmptyValueException : ApplicationException
+    {
+        public EmptyValueException()
+            : base("Значение не введено")
+        { }
+    }
+}

Library15Gerimovich/Exceptions/MalformedRealException.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Library15Gerimovich.Exceptions
+{
+    public class MalformedRealException : ApplicationException
+    {
+        public MalformedRealException()
+            : base("Введенное значение не является вещественным")
+        { }
+    }
+}

Library15Gerimovich/InputRealNumber.Designer.cs

@@ -29,25 +29,34 @@
         private void InitializeComponent()
         {
             this.IsNullCheckBox = new System.Windows.Forms.CheckBox();
+            this.MainTextBox = new System.Windows.Forms.TextBox();
             this.SuspendLayout();
             // 
             // IsNullCheckBox
             // 
             this.IsNullCheckBox.AutoSize = true;
-            this.IsNullCheckBox.Location = new System.Drawing.Point(42, 103);
+            this.IsNullCheckBox.Location = new System.Drawing.Point(3, 62);
             this.IsNullCheckBox.Name = "IsNullCheckBox";
-            this.IsNullCheckBox.Size = new System.Drawing.Size(83, 19);
+            this.IsNullCheckBox.Size = new System.Drawing.Size(127, 19);
             this.IsNullCheckBox.TabIndex = 0;
-            this.IsNullCheckBox.Text = "checkBox1";
+            this.IsNullCheckBox.Text = "Нулевое значение";
             this.IsNullCheckBox.UseVisualStyleBackColor = true;
             // 
+            // MainTextBox
+            // 
+            this.MainTextBox.Location = new System.Drawing.Point(3, 20);
+            this.MainTextBox.Name = "MainTextBox";
+            this.MainTextBox.Size = new System.Drawing.Size(127, 23);
+            this.MainTextBox.TabIndex = 1;
+            // 
             // InputRealNumber
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 15F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.Controls.Add(this.MainTextBox);
             this.Controls.Add(this.IsNullCheckBox);
             this.Name = "InputRealNumber";
-            this.Size = new System.Drawing.Size(188, 187);
+            this.Size = new System.Drawing.Size(135, 101);
             this.ResumeLayout(false);
             this.PerformLayout();
 
@@ -56,5 +65,6 @@
         #endregion
 
         private CheckBox IsNullCheckBox;
+        private TextBox MainTextBox;
     }
 }

Library15Gerimovich/InputRealNumber.cs

@@ -7,14 +7,85 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
+using Library15Gerimovich.Exceptions;
 
 namespace Library15Gerimovich
 {
     public partial class InputRealNumber : UserControl
     {
+        private event EventHandler? _valueChanged;
+
         public InputRealNumber()
         {
             InitializeComponent();
         }
+
+        /// <summary>
+        /// Установка и получение введенного значения
+        /// </summary>
+        public int? IntValue
+        {
+            get
+            {
+                if (IsNullCheckBox.Checked)
+                {
+                    return null;
+                }
+
+                if (string.IsNullOrEmpty(MainTextBox.Text))
+                {
+                    throw new EmptyValueException();
+                }
+
+                int ParsedInt;
+                if (Int32.TryParse(MainTextBox.Text, out ParsedInt))
+                {
+                    return ParsedInt;
+                }
+                else
+                {
+                    throw new MalformedRealException();
+                }
+            }
+            set
+            {
+                SetNullState(value is null, true);
+                if (value is not null)
+                {
+                    MainTextBox.Text = value.ToString();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Событие, вызываемое при смене значения (либо при смене CheckBox)
+        /// </summary>
+        public event EventHandler? ValueChanged
+        {
+            add { _valueChanged += value; }
+            remove { _valueChanged -= value; }
+        }
+
+        private void SetNullState(bool IsNull, bool ClearText = false)
+        {
+            IsNullCheckBox.Checked = IsNull;
+            MainTextBox.Enabled = !IsNull;
+
+            if (ClearText)
+            {
+                MainTextBox.Text = string.Empty;
+            }
+        }
+
+        private void IsNullCheckBox_CheckedChanged(object sender, EventArgs e)
+        {
+            SetNullState(IsNullCheckBox.Checked);
+            _valueChanged?.Invoke(this, e);
+        }
+
+        private void MainTextBox_TextChanged(object sender, EventArgs e)
+        {
+            _valueChanged?.Invoke(this, e);
+        }
     }
 }

Library15Gerimovich/Models/CustomDataTableColumnParameter.cs

@@ -0,0 +1,13 @@
+namespace Library15Gerimovich.Models
+{
+    public record CustomDataTableColumnParameter
+    {
+        public string HeaderName { get; init; } = string.Empty;
+
+        public int Width { get; init; } = 0;
+
+        public bool Visible { get; init; } = true;
+
+        public string PropertyName { get; init; } = string.Empty;
+    }
+}

Library15Gerimovich/OutputTableResults.cs

@@ -8,6 +8,7 @@ using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
+using Library15Gerimovich.Models;
 
 namespace Library15Gerimovich
 {