Template2

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using ChatworkBulkSender.UserControls;

namespace ChatworkBulkSender.Forms
{
    public partial class T_SendHistory : Form
    {
        private HistorySearchBoxControl _historySearchBox = null;

        private SendHistoryDgvControl _sendHistoryDgv = null;

        private BtnReturnControl _btnControl = null;

        public T_SendHistory()
        {
            InitializeComponent();

            // 初期のウィンドウサイズ
            this.ClientSize = new Size(1600, 900);
            this.MinimumSize = new Size(1000, 600);

            // 初期の表示位置
            this.StartPosition = FormStartPosition.CenterScreen;

            _historySearchBox = new HistorySearchBoxControl();
            _sendHistoryDgv = new SendHistoryDgvControl();
            _btnControl = new BtnReturnControl();

            _historySearchBox.Dock = DockStyle.Fill;
            _sendHistoryDgv.Dock = DockStyle.Fill;

            panelSearch.Controls.Add(_historySearchBox);
            panelDgv.Controls.Add(_sendHistoryDgv);
            panelBtn.Controls.Add(_btnControl);

        }

        private void T_SendHistory_Load(object sender, EventArgs e)
        {
            this.ActiveControl = panelSearch;

            _btnControl.BtnReturnClicked += BtnReturn_Click;

            // 検索イベントの登録
            _historySearchBox.SearchRequested += HistorySearchBox_SearchRequested;
        }

        private void DisposeViewControls()
        {
            panelSearch.Controls.Clear();
            panelDgv.Controls.Clear();
            panelBtn.Controls.Clear();

            _historySearchBox.Dispose();
            _sendHistoryDgv.Dispose();
            _btnControl.Dispose();
        }

        /// <summary>
        /// 戻るボタンクリックで画面を閉じる
        /// </summary>
        private void BtnReturn_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        /// <summary>
        /// 検索イベントハンドラ
        /// </summary>
        private void HistorySearchBox_SearchRequested(object sender, Dictionary<string, object> criteria)
        {
            _sendHistoryDgv.Search(criteria);
        }

        private void T_SendHistory_FormClosing(object sender, FormClosingEventArgs e)
        {
            // 確認メッセージは表示しない（戻るボタンからの終了時）

            // イベント登録の解除
            _btnControl.BtnReturnClicked -= BtnReturn_Click;
            _historySearchBox.SearchRequested -= HistorySearchBox_SearchRequested;

            // 明示的に解放する
            this.DisposeViewControls();

            // 設定メニューを表示する
            this.Owner.Show();

            // 再描写を行う
            this.Owner.Refresh();

        }
    }
}