Что-то написал

Components/CustomDataGridView.Designer.cs

@@ -28,10 +28,31 @@
 		/// </summary>
 		private void InitializeComponent()
 		{
-			components = new System.ComponentModel.Container();
+			dataGridView = new DataGridView();
-			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+			((System.ComponentModel.ISupportInitialize)dataGridView).BeginInit();
+			SuspendLayout();
+			// 
+			// dataGridView
+			// 
+			dataGridView.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
+			dataGridView.Location = new Point(3, 3);
+			dataGridView.Name = "dataGridView";
+			dataGridView.Size = new Size(445, 363);
+			dataGridView.TabIndex = 0;
+			// 
+			// ValueTableControl
+			// 
+			AutoScaleDimensions = new SizeF(7F, 15F);
+			AutoScaleMode = AutoScaleMode.Font;
+			Controls.Add(dataGridView);
+			Name = "ValueTableControl";
+			Size = new Size(451, 369);
+			((System.ComponentModel.ISupportInitialize)dataGridView).EndInit();
+			ResumeLayout(false);
 		}
 
 		#endregion
+
+		private DataGridView dataGridView;
 	}
 }

Components/CustomDataGridView.cs

@@ -15,6 +15,89 @@ namespace Components
 		public CustomDataGridView()
 		{
 			InitializeComponent();
+			ConfigureDataGridView();
+		}
+
+		private void ConfigureDataGridView()
+		{
+			dataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
+			dataGridView.MultiSelect = false;
+			dataGridView.RowHeadersVisible = false;
+			dataGridView.AllowUserToAddRows = false;
+
+			dataGridView.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
+		}
+
+		public void ConfigureColumns(List<(string HeaderText, string DataPropertyName, float FillWeight)> columns)
+		{
+			dataGridView.Columns.Clear();
+
+			foreach (var column in columns)
+			{
+				dataGridView.Columns.Add(new DataGridViewTextBoxColumn
+				{
+					HeaderText = column.HeaderText,
+					DataPropertyName = column.DataPropertyName,
+					FillWeight = column.FillWeight
+				});
+			}
+		}
+
+		public void ClearRows()
+		{
+			dataGridView.Rows.Clear();
+		}
+
+		public int SelectedRowIndex
+		{
+			get => dataGridView.SelectedRows[0].Index;
+			set
+			{
+				if (value >= 0 && value < dataGridView.Rows.Count)
+				{
+					dataGridView.ClearSelection();
+					dataGridView.Rows[value].Selected = true;
+				}
+			}
+		}
+
+		public T GetSelectedObject<T>() where T : new()
+		{
+			if (dataGridView.SelectedRows.Count == 0)
+				throw new InvalidOperationException("Нет выбранной строки.");
+
+			var selectedRow = dataGridView.SelectedRows[0];
+			var obj = new T();
+
+			foreach (DataGridViewColumn column in dataGridView.Columns)
+			{
+				var prop = typeof(T).GetProperty(column.DataPropertyName);
+				if (prop != null)
+				{
+					var value = selectedRow.Cells[column.Index].Value;
+					prop.SetValue(obj, Convert.ChangeType(value, prop.PropertyType));
+				}
+			}
+
+			return obj;
+		}
+
+		public void FillData<T>(List<T> objects)
+		{
+			dataGridView.Rows.Clear();
+
+			if (objects == null || !objects.Any())
+			{
+				return;
+			}
+
+			var properties = typeof(T).GetProperties();
+
+			foreach (var obj in objects)
+			{
+				var values = properties.Select(p => p.GetValue(obj, null)).ToArray();
+				dataGridView.Rows.Add(values);
+			}
 		}
 	}
 }

Components/CustomListBox.cs

@@ -32,13 +32,14 @@ namespace Components
 		public string SelectedItem
 		{
 			get { return (string?)listBox.SelectedItem ?? string.Empty; }
-			set { listBox.SelectedItem = value; }
+			set 
-		}
-
-		public event EventHandler? ItemSelected
 			{
-			add { _itemSelected += value; }
+				int index = listBox.Items.IndexOf(value);
-			remove { _itemSelected -= value; }
+				if (index != -1)
+				{
+					listBox.SelectedIndex = index;
+				}
+			}
 		}
 
 		private void MainListBox_SelectedIndexChanged(object sender, EventArgs e)

Components/CustomTextBox.Designer.cs

@@ -28,10 +28,41 @@
 		/// </summary>
 		private void InitializeComponent()
 		{
-			components = new System.ComponentModel.Container();
+			checkBoxNull = new CheckBox();
-			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+			textBoxInteger = new TextBox();
+			SuspendLayout();
+			// 
+			// checkBoxNull
+			// 
+			checkBoxNull.AutoSize = true;
+			checkBoxNull.Location = new Point(13, 17);
+			checkBoxNull.Name = "checkBoxNull";
+			checkBoxNull.Size = new Size(15, 14);
+			checkBoxNull.TabIndex = 0;
+			checkBoxNull.UseVisualStyleBackColor = true;
+			// 
+			// textBoxInteger
+			// 
+			textBoxInteger.Location = new Point(34, 13);
+			textBoxInteger.Name = "textBoxInteger";
+			textBoxInteger.Size = new Size(100, 23);
+			textBoxInteger.TabIndex = 1;
+			// 
+			// IntegerInputControl
+			// 
+			AutoScaleDimensions = new SizeF(7F, 15F);
+			AutoScaleMode = AutoScaleMode.Font;
+			Controls.Add(textBoxInteger);
+			Controls.Add(checkBoxNull);
+			Name = "IntegerInputControl";
+			Size = new Size(146, 49);
+			ResumeLayout(false);
+			PerformLayout();
 		}
 
 		#endregion
+
+		private CheckBox checkBoxNull;
+		private TextBox textBoxInteger;
 	}
 }

Components/CustomTextBox.cs

@@ -1,4 +1,5 @@
-using System;
+using Components.Exceptions;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
@@ -12,9 +13,60 @@ namespace Components
 {
 	public partial class CustomTextBox : UserControl
 	{
+		public event EventHandler ValueChanged;
+
 		public CustomTextBox()
 		{
 			InitializeComponent();
+
+			checkBoxNull.CheckedChanged += CheckBoxNull_CheckedChanged;
+			textBoxInteger.TextChanged += TextBoxInteger_TextChanged;
+		}
+
+		public int? Value
+		{
+			get
+			{
+				if (checkBoxNull.Checked)
+				{
+					return null;
+				}
+				else
+				{
+					if (int.TryParse(textBoxInteger.Text, out int result))
+					{
+						return result;
+					}
+					else
+					{
+						throw new NotIntegerException("Ожидается целое число.");
+					}
+				}
+			}
+			set
+			{
+				if (value.HasValue)
+				{
+					checkBoxNull.Checked = false;
+					textBoxInteger.Text = value.ToString();
+				}
+				else
+				{
+					checkBoxNull.Checked = true;
+					textBoxInteger.Text = string.Empty;
+				}
+			}
+		}
+
+		private void TextBoxInteger_TextChanged(object sender, EventArgs e)
+		{
+			ValueChanged?.Invoke(this, e);
+		}
+
+		private void CheckBoxNull_CheckedChanged(object sender, EventArgs e)
+		{
+			textBoxInteger.Enabled = !checkBoxNull.Checked;
+			ValueChanged?.Invoke(this, e);
 		}
 	}
 }

Components/Exception/NotIntegerException.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Components.Exceptions
+{
+	internal class NotIntegerException: Exception
+	{
+		public NotIntegerException(string message) : base(message) { }
+	}
+}

Components/Person.cs

@@ -4,11 +4,13 @@
 	{
 		public string Name { get; set; }
 		public int Age { get; set; }
+		public string Email { get; set; }
 
-		public Person(string name, int age)
+		public Person(string name, int age, string email)
 		{
 			Name = name;
 			Age = age;
+			Email = email;
 		}
 	}
 }

WinFormsTest/Form1.Designer.cs

@@ -29,6 +29,8 @@
 		private void InitializeComponent()
 		{
 			customListBox = new Components.CustomListBox();
+			customTextBox = new Components.CustomTextBox();
+			customDataGridView1 = new Components.CustomDataGridView();
 			SuspendLayout();
 			// 
 			// customListBox
@@ -39,11 +41,27 @@
 			customListBox.Size = new Size(150, 150);
 			customListBox.TabIndex = 0;
 			// 
+			// customTextBox
+			// 
+			customTextBox.Location = new Point(250, 40);
+			customTextBox.Name = "customTextBox";
+			customTextBox.Size = new Size(150, 150);
+			customTextBox.TabIndex = 1;
+			// 
+			// customDataGridView1
+			// 
+			customDataGridView1.Location = new Point(470, 50);
+			customDataGridView1.Name = "customDataGridView1";
+			customDataGridView1.Size = new Size(449, 150);
+			customDataGridView1.TabIndex = 2;
+			// 
 			// Form1
 			// 
 			AutoScaleDimensions = new SizeF(7F, 15F);
 			AutoScaleMode = AutoScaleMode.Font;
-			ClientSize = new Size(800, 450);
+			ClientSize = new Size(1003, 257);
+			Controls.Add(customDataGridView1);
+			Controls.Add(customTextBox);
 			Controls.Add(customListBox);
 			Name = "Form1";
 			Text = "Form1";
@@ -53,5 +71,7 @@
 		#endregion
 
 		private Components.CustomListBox customListBox;
+		private Components.CustomTextBox customTextBox;
+		private Components.CustomDataGridView customDataGridView1;
 	}
 }

WinFormsTest/Form1.cs

@@ -1,4 +1,5 @@
 using Components;
+using Components.Object;
 
 namespace WinFormsTest
 {
@@ -9,6 +10,7 @@ namespace WinFormsTest
 			InitializeComponent();
 
 			InitializeListBox();
+			InitializeDataGridView();
 		}
 
 		private void InitializeListBox()
@@ -22,5 +24,23 @@ namespace WinFormsTest
 				"Hi 5",
 			});
 		}
+
+		private void InitializeDataGridView()
+		{
+			var columns = new List<(string HeaderText, string DataPropertyName, float FillWeight)>
+			{
+				("Èìÿ", "Name", 1),
+				("Âîçðàñò", "Age", 1),
+				("Email", "Email", 2)
+			};
+			customDataGridView1.ConfigureColumns(columns);
+
+			var data = new List<Person>
+			{
+				new Person ("Èâàí", 30, "ivan@gmail.com" ),
+				new Person ("Ìàðèÿ", 25, "maria@gmail.com")
+			};
+			customDataGridView1.FillData(data);
+		}
 	}
 }