KOZ60

DataGridView のヘッダ列が他の行と文字の位置が違うので、DataGridViewTextBoxCell を参考にカスタマイズしました。

Public Class FitHeaderCell
	Inherits DataGridViewColumnHeaderCell

	Private Const DATAGRIDVIEWTEXTBOXCELL_ignoreNextMouseClick As Byte = 1
	Private Const DATAGRIDVIEWTEXTBOXCELL_horizontalTextOffsetLeft As Byte = 3
	Private Const DATAGRIDVIEWTEXTBOXCELL_horizontalTextOffsetRight As Byte = 4
	Private Const DATAGRIDVIEWTEXTBOXCELL_horizontalTextMarginLeft As Byte = 0

KOZ60

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Threading;
using Microsoft.Win32.SafeHandles;

[DesignerCategory("code")]
public class WaitableTimer : Component
{
    private static object eventElapsed = new object();

KOZ60

using System;
using System.Windows.Forms;

public class NativeWindowBase : NativeWindow, IDisposable
{
    private bool isDisposed;
    private readonly Control owner;

    public NativeWindowBase(Control owner) {
        this.owner = owner;

KOZ60

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using Mono.Cecil;
using Mono.Cecil.Pdb;

class Program
{

KOZ60

#nullable disable
#pragma warning disable 

using System.Diagnostics;
using System.Net.NetworkInformation;
using System.Reflection;
using System.Security.Principal;
using System.Text;
using System.Text.RegularExpressions;
using NAudio.CoreAudioApi;

KOZ60

1. Enable double buffering
2. Commit a value when selected in ComboBox/CheckBox
3. Preventing and canceling drawing with BeginUpdate/EndUpdate
4. When the ReadOnly property is changed to false, all columns from becoming editable
5. Clipboard Operations (Clear/Paste)

using System;
using System.Text;
using System.Collections.Generic;

KOZ60

using System;
using System.Runtime.InteropServices;
using static System.IO.Path;

/// <summary>
/// 32000 character filename
/// </summary>
/// <remarks>
/// When used as an argument to a Windows API, it will convert the filename to one that is 32K characters long.
/// You can also use the Win32FileName property as an argument to System.IO to support up to 32,000 characters.

KOZ60

using System;
using System.Text;

public class XLColumn : IEquatable<XLColumn>
{
    private const string mask = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private readonly int columnIndex;

    public XLColumn(int value) {
        columnIndex = value;

KOZ60

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

[DesignerCategory("code")]
public class FontDialogEx : FontDialog

KOZ60

Imports System.Runtime.InteropServices

Module Module1

    Sub Main()
        AddCustomPaperSize(Nothing, "Custom Paper Sample", FormFlags.Printer, 10000, 10000, 9000, 9000)
    End Sub

    Public Enum FormFlags
        User