C#通过子窗体刷新父窗体的实现方法_开发_开发者

1、实现方法

实现通过子窗体刷新父窗体时，主要通过在自定义事件中执行数据绑定来对主窗体进行刷新，即当子窗体产生更新操作时，通过子窗体的一个方法触发主窗体中对应的事件，这个过程主要用到了EventHandler事件。

EventHandler事件主要是通过EventHandler委托来实现的，该委托表示处理不包含事件数据的事件的方法。语法格式如下：

public delegate void EventHandler(Object sender,EventArgs e)
参数说明
Sender：事件源。
e：不包含任何事件数据的EventArgs事件数据。

例如，通过使用EventHandler事件为子窗体添加一个事件处理程序，以便能够刷新父窗体中的数据。

在子窗体里：

/// <summary>
/// 某一个事件，比如，添加
/// </summary>
private void Button1_Click(object? sender, EventArgs e)
{
    GlobalFlag = true;                          //设定标识的值为true
    if (!(comboBox1.Items.Equals(idContent)))   //当Combobox控件中不存在将添加的信息时
    {
        comboBox1.Items.Add(idContent!);        //在Combobox控件中添加一条记录
    }
    UpdateData();
}
 
// 其它
 
/// <summary>
/// 更新DataGridView控件中的内容
/// </summary>
protected void UpdateData()
{
    UpdateDataGridView?.Invoke(this, EventArgs.Empty);
}

在主窗体里：

// 添加子窗体的事件
public void CreateFrmChild()
{
    Frm_Child BabyWindow = new()
    {
        MdiParent = this,
    };
    dataGridView1.Controls.Add(BabyWindow);
    BabyWindow.UpdateDataGridView += new EventHandler(BabyWindow_UpdateDataGridView!);
    BabyWindow.Show();
}
 
// 其它
 
/// <summary>
/// 实现事件委托
/// </summary>
void BabyWindow_UpdateDataGridView(object sender, EventArgs e)
{
    // 其它
}

2.SqlCommand类

本实例中使用了SQL，主窗体的数据读取自SQL，在子窗体里更新，然后回写SQL，其结果再次更新到主窗体。

在C#中执行SQL语句时，可以使用SqlCommand类，该类主要用于向SQL Server数据库发送SQL语句。

本实例的数据库连接字符串：

//数据库连接字符串
readonly string? ConnString = "Data Source=DESKTOP-3LV13FS;DataBase=db_TomeOne;integrated security=SSPI;TrustServerCertificate=true;";

还有，在.NET 8.0中，要使用命名空间：using Microsoft.Data.SqlClient;因为 using System.Data.SqlClient; 已经废弃。

3.实例的主窗体Frm_Main：

（1）Frm_Main.Designer.cs

namespace _197
{
    partial class Frm_Main
    {
        /// <summary>
        ///  Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
 
        /// <summary>
        ///  Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
 
        #region Windows Form Designer generated code
 
        /// <summary>
        ///  Required method for Designer support - do not modify
        ///  the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            menuStrip1 = new MenuStrip();
            toolStripMenuItem1 = new ToolStripMenuItem();
            toolStripMenuItem2 = new ToolStripMenuItem();
            toolStripMenuItem3 = new ToolStripMenuItem();
            dataGridView1 = new DataGridView();
            menuStrip1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
            SuspendLayout();
            // 
            // menuStrip1
            // 
            menuStrip1.BackColor = SystemColors.ControlDark;
            menuStrip1.Items.AddRange(new ToolStripItem[] { toolStripMenuItem1 });
            menuStrip1.Location = new Point(0, 0);
            menuStrip1.Name = "menuStrip1";
            menuStrip1.Size = new Size(335, 25);
            menuStrip1.TabIndex = 0;
            menuStrip1.Text = "menuStrip1";
            // 
            // toolStripMenuItem1
            // 
            toolStripMenuItem1.DropDownItems.AddRange(new ToolStripItem[] { toolStripMenuItem2, toolStripMenuItem3 });
            toolStripMenuItem1.Name = "toolStripMenuItem1";
            toolStripMenuItem1.Size = new Size(44, 21);
            toolStripMenuItem1.Text = "操作";
            // 
            // toolStripMenuItem2
            // 
            toolStripMenuItem2.Name = "toolStripMenuItem2";
            toolStripMenuItem2.Size = new Size(136, 22);
            toolStripMenuItem2.Text = "添加或删除";
            toolStripMenuItem2.Click += ToolStripMenuItem2_Click;
            // 
            // toolStripMenuItem3
            // 
            toolStripMenuItem3.Name = "toolStripMenuItem3";
            toolStripMenuItem3.Size = new Size(136, 22);
            toolStripMenuItem3.Text = "退出";
            toolStripMenuItem3.Click += ToolStripMenuItem3_Click;
            // 
            // dataGridView1
            // 
            dataGridView1.AllowUserToAddRows = false;
            dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            dataGridView1.Dock = DockStyle.Fill;
            dataGridView1.Location = new Point(0, 25);
            dataGridView1.Name = "dataGridView1";
            dataGridView1.Size = new Size(335, 178);
            dataGridView1.TabIndex = 1;
            // 
            // Frm_Main
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(335, 203);
            Controls.Add(dataGridView1);
            Controls.Add(menuStrip1);
            IsMdiContainer = true;
            MainMenuStrip = menuStrip1;
            Name = "Frm_Main";
            Text = "主窗体";
            Load += Frm_Main_Load;
            menuStrip1.ResumeLayout(false);
            menuStrip1.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit();
            ResumeLayout(false);
            PerformLayout();
        }
 
        #endregion
 
        private MenuStrip menuStrip1;
        private ToolStripMenuItem toolStripMenuItem1;
        private ToolStripMenuItem toolStripMenuItem2;
        private ToolStripMenuItem toolStripMenuItem3;
        private DataGridView dataGridView1;
    }
}

（2）Frm_Main.cs

// 通过子窗体刷新父窗体
// 设置主窗体的IsMdiContainer=true;
using System.Data;
using Microsoft.Data.SqlClient;
 
namespace _197
{
    public partial class Frm_Main : Form
    {   
        public Frm_Main()
        {
            InitializeComponent();
        }
 
        #region 声明的变量
        private static bool flag = false;   //标识是否创建新的子窗体
        readonly Frm_Child BabyWindow = new();//实例化一个子窗体
        readonly DataSet PubsSet = new();   //定义一个数据集对象
        private static string[]? iDArray;   //声明一个一维字符串数组
        public DataTable? IDTable;          //声明一个数据表对象
        SqlDataAdapter? IDAdapter;          //声明一个数据读取器对象
        SqlDataAdapter? PubsAdapter;        //声明一个数据读取器对象
        SqlConnection? ConnPubs;            //声明一个数据库连接对象
        SqlCommand? PersonalInformation;    //声明一个执行SQL语句的对象
 
        public static string[]? IDArray { get => iDArray; set => iDArray = value; }
        public static bool Flag { get => flag; set => flag = value; }
        
        readonly string? ConnString         //数据库连接字符串
            = "Data Source=DESKTOP-3LV13FS;DataBase=db_TomeOne;integrated security=SSPI;TrustServerCertificate=true;";
        #endregion
 
        private void Frm_Main_Load(object? sender, EventArgs e)
        {
            string AdapterString = "select userID as 编号,userName as 姓名 ,phone as 电话,address as 住址 from tb_User";//用于查询的字符串
            string IDString = "select userID from tb_User";//读取数据库中用户的ID编号字符串
            ConnPubs = new SqlConnection(ConnString);//建立数据库连接
            PubsAdapter = new SqlDataAdapter(AdapterString, ConnPubs);//创建PubsAdapter数据读取器
            IDAdapter = new SqlDataAdapter(IDString, ConnPubs);       //用于读取用户编号的读取器
            PubsAdapter.Fill(PubsSet, "tb_User");            //填充PubsSet数据集
            IDAdapter.Fill(PubsSet, "ID");                   //填充PubsSet数据集
            DataTable PubsTable = PubsSet.Tables["tb_User"]!;//将数据写入PubsTable表
            IDTable = PubsSet.Tables["ID"]!;                 //将数据写入ID表
            IDArray = new string[IDTable.Rows.Count];        //为数组定义最大长度
            dataGridView1.DataSource = PubsTable.DefaultView;//设置dataGridView1的数据源
            for (int i = 0; i < IDTable.Rows.Count; i++)     //循环遍历数据表中的每一行数据
            {
                for (int j = 0; j < IDTable.Columns.Count; j++)//循环遍历数据表中的每一列数据
                {
                    IDArray[i] = IDTable.Rows[i][j].ToString()!;//将数据表中的数据添加至一个一维数组
                }
            }
        }
 
        #region 创建子窗体的CreateFrmChild方法
        /// <summary>
        /// 设置子窗体的父窗体为当前窗体;
        /// 实例化一个子窗体;
        /// 在DataGridView控件中添加子窗体;
        /// 显示子窗体;
        /// </summary>
        public void CreateFrmChild()
        {
            Frm_Child BabyWindow = new()
            {
                MdiParent = this,
            };
            dataGridView1.Controls.Add(BabyWindow);
            BabyWindow.UpdateDataGridView += new EventHandler(BabyWindow_UpdateDataGridView!);
            BabyWindow.Show();
        }
        /// <summary>
        /// 事件委托
        /// </summary>
        void BabyWindow_UpdateDataGridView(object sender, EventArgs e)
        {
            if (Frm_Child.GlobalFlag == false)   编程客栈 //当单击删除按钮时
            {
                if (ConnPubs!.State == ConnectionState.Closed) //当数据库处于断开状态时
                {
                    ConnPubs.Open();              //打开数据库的连接
                }
                string AfreshString = "delete tb_User where userID=" + Frm_Child.DeleteID!.Trim();//定义一个删除数据的字符串
                PersonalInformation = new SqlCommand(AfreshString, ConnPubs); //执行删除数据库字段
                PersonalInformation.ExecuteNonQuery(); //执行SQL语句并返回受影响的行数
                ConnPubs.Close();                      //关闭数据库
                DisplayData();                         //显示数据库更新后的内容
                MessageBox.Show("数据删除成功！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
                if (ConnPubs!.State == ConnectionState.Closed) //当数据库处于关闭状态时
                {
                    ConnPubs.Open();    //打开数据库
                }
                string InsertString = "insert into tb_User values('" + Frm_Child.IdContent + "','" + Frm_Child.NameContent + "','" + Frm_Child.PhoneContent + "','" 编程+ Frm_Child.AddressContent + "')";//定义一个插入数据的字符串变量
                PersonalInformation = new SqlCommand(InsertString, ConnPubs);//执行插入数据库字段
                PersonalInformation.ExecuteNonQuery();          //执行SQL语句并返回受影响的行数
                ConnPubs.Close();        //关闭数据库
                DisplayData();           //显示更新后的数据
                MessageBox.Show("数据添加成功！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
        }
        #endregion
 
        #region 用于读取数据库的DisplayData方法
        public void DisplayData()
        {
            PubsSet.Clear();
            ConnPubs = new SqlConnection(ConnString); 
            string DisplayString = "select userId as 编号,userName as 姓名 ,phone as 电话,address as 住址 from tb_User";//定义读取数据库的字段
            SqlDataAdapter PersonalAdapter = new(DisplayString, ConnPubs);    //定义一个读取数据库数据的读取器
            PersonalAdapter.Fill(PubsSet, "tb_User");                                            //向表DisplayTable中填充数据
            dataGridView1.DataSource = PubsSet.Tables["tb_User"]!.DefaultView; //设定DataGridView控件的数据源
        }
        #endregion
        /// <summary>
        /// 添加或删除记录
        /// 创建子窗体的CreateFrmChild方法
        /// </summary>
        private void ToolStripMenuItem2_Click(object sender, EventArgs e)
        {
            if (flag == false)   //判断标识的值决定是否创建窗体
            {
                CreateFrmChild();//创建子窗体
            }
            for (int i = 0; i < dataGridView1.Controls.Count; i++)                      //循环遍历DataGridView控件上的控件集
            {
                if (dataGridView1.Controls[i].Name.Equals(BabyWindow.Name)) //当存在子窗体时
                {
                    flag = true; //改变标识Flag的值
                    break;       //退出循环体
                }
            }
        }
        /// <summary>
        /// 退出
        /// </summary>
        private void ToolStripMenuItem3_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
    }
}

4.实例的子窗体Frm_Child：

（1） Frm_Child.Designer.cs

namespace _197
{
    partial class Frm_Child
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
 
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
 
        #region Windows Form Designer generated code
 
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            groupBox1 = new GroupBox();
            button2 = new Button();
            button1 = new Button();
            Record_Address = new TextBox();
            Record_Phone = new TextBox();
            Record_Name = new TextBox();
            Record_ID = new TextBox();
            label4 = new Label();
            label3 = new Label();
            label2 = new Label();
            label1 = new Label();
            groupBox2 = new GroupBox();
            button3 = new Button();
            comboBox1 = new ComboBox();
            label5 = new Label();
            groupBox1.SuspendLayout();
            groupBox2.SuspendLayout();
            SuspendLayout();
            // 
            // groupBox1
            // 
            groupBox1.Controls.Add(button2);
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(Record_Address);
            groupBox1.Controls.Add(Record_Phone);
            groupBox1.Controls.Add(Record_Name);
            groupBox1.Controls.Add(Record_ID);
            groupBox1.Controls.Add(label4);
            groupBox1.Controls.Add(label3);
            groupBox1.Controls.Add(label2);
            groupBox1.Controls.Add(label1);
            groupBox1.Location = new Point(12, 12);
            groupBox1.Name = "groupBox1";
            groupBox1.Size = new Size(270, 157);
            groupBox1.TabIndex = 0;
            groupBox1.TabStop = false;
            groupBox1.Text = "添加信息";
            // 
            // button2
            // 
            button2.Location = new Point(187, 56);
            button2.Name = "button2";
            button2.Size = new Size(75, 23);
            button2.TabIndex = 9;
            button2.Text = "清空";
            button2.UseVisualStyleBackColor = true;
            button2.Click += Button2_Click;
            // 
            // button1
            // 
            button1.Location = new Point(187, 25);
            button1.Name = "button1";
            button1.Size = new Size(77, 23);
            button1.TabIndex = 8;
            button1.Text = "提交";
            button1.UseVisualStyleBackColor = true;
            button1.Click += Button1_Click;
            // 
            // Record_Address
            // 
            Record_Address.Location = new Point(72, 118);
            Record_Address.Name = "Record_Address";
            Record_Address.Size = new Size(100, 23);
            Record_Address.TabIndex = 7;
            Record_Address.TextChanged += Record_Address_TextChanged;
            // 
            // Record_Phone
            // 
            Record_Phone.Location = new Point(72, 87);
            Record_Phone.Name = "Record_Phone";
            Record_Phone.Size = new Size(100, 23);
            Record_Phone.TabIndex = 6;
            Record_Phone.TextChanged += Record_Phone_TextChanged;
            // 
            // Record_Name
            // 
            Record_Name.Location = new Point(72, 56);
            Record_Name.Name = "Record_Name";
            Record_Name.Size = new Size(100, 23);
            Record_Name.TabIndex = 5;
            Record_Name.TextChanged += Record_Name_TextChanged;
            // 
            // Record_ID
            // 
            Record_ID.Location = new Point(72, 25);
            Record_ID.Name = "Record_ID";
            Record_ID.Size = new Size(100, 23);
            Record_ID.TabIndex = 4;
            Record_ID.TextChanged += Record_ID_TextChanged;
            // 
            // label4
            // 
            label4.AutoSize = true;
            label4.Location = new Point(11, 118);
            label4.Name = "label4";
            label4.Size = new Size(44, 17);
            label4.TabIndex = 3;
            label4.Text = "地址：";
            // 
            // label3
            // 
            label3.AutoSize = true;
            label3.Location = new Point(11, 87);
            label3.Name = "label3";
            label3.Size = new Size(44, 17);
            label3.TabIndex = 2;
            label3.Text = "电话：";
            // 
            // label2
            // 
            label2.AutoSize = true;
            label2.Location = new Point(11, 56);
            label2.Name = "label2";
            label2.Size = new Size(44, 17);
            label2.TabIndex = 1;
            label2.Text = "姓名：";
            // 
            // label1
            // 
            label1.AutoSize = true;
            label1.Location = new Point(11, 25);
            label1.Name = "label1";
            label1.Size = new Size(44, 17);
            label1.TabIndex = 0;
            label1.Text = "编号：";
            // 
            // groupBox2
            // 
            groupBox2.Controls.Add(button3);
            groupBox2.Controls.Add(comboBox1);
            groupBox2.Controls.Add(label5);
            groupBox2.Location = new Point(12, 175);
            groupBox2.Name = "groupBox2";
            groupBox2.Size = new Size(270, 54);
            groupBox2.TabIndex = 1;
            groupBox2.TabStop = false;
            groupBox2.Text = "删除信息";
            // 
            // button3
            // 
            button3.Location = new Point(187, 24);
            button3.Name = "button3";
            button3.Size = new Size(75, 23);
            button3.TabIndex = 2;
            button3.Text = "删除";
            button3.UseVisualStyleBackColor = true;
            button3.Click += Button3_Click;
            // 
            // comboBox1
         www.devze.com   // 
            comboBox1.FormattingEnabled = true;
            comboBox1.Location = new Point(72, 24);
            comboBox1.Name = "comboBox1";
            comboBox1.Size = new Size(100, 25);
            comboBox1.TabIndex = 1;
            // 
            // label5
            // 
            label5.AutoSize = true;
            label5.Location = new Point(11, 30);
            label5.Name = "label5";
            label5.Size = new Size(44, 17);
            label5.TabIndex = 0;
            label5.Text = "编号：";
            // 
            // Frm_Child
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(294, 241);
            Controls.Add(groupBox2);
            Controls.Add(groupBox1);
            MaximizeBox = false;    //最大化按钮没有意义
            Name = "Frm_Child";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "子窗体";
            FormClosing += Frm_Child_FormClosing;
            Load += Frm_Child_Load;
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
            groupBox2.ResumeLayout(false);
            groupBox2.PerformLayout();
            ResumeLayout(false);
        }
 
        #endregion
 
        private GroupBox groupBox1;
        private TextBox Record_Address;
        private TextBox Record_Phone;
        private TextBox Record_Name;
        private TextBox Record_ID;
        private Label label4;
        private Label label3;
        private Label label2;
        private Label label1;
        private GroupBox groupBox2;
        private Button button2;
        private Button button1;
        private Button button3;
        private ComboBox comboBox1;
        private Label label5;
    }
}

（2）Frm_Child.cs

// 本实例仅可创建一个窗口:
// 最大化后没有实际意义，因此关闭MaximizeBox属性值为False
namespace _197
{
    public partial class Frm_Child : Form
    {
        #region 变量的声明
        public event EventHandler? UpdateDataGridView = null;//定义一个处理更新DataGridView控件内容的方法
        private static string? deleteID;       编程 //定义一个表示删除数据编号的字符串
        private static string? idContent;       //该变量用来存储数据编号
        private static string? nameContent;     //该变量用来存储姓名
        private static string? phoneContent;    //该变量用来存储电话
        private static string? addressContent;  //该变量用来存储住址
        private static bool globalFlag;         //该变量用来标识是否创建新的子窗体
 
        public static string? DeleteID { get => deleteID; set => deleteID = value; }
        public static string? IdContent { get => idContent; set => idContent = value; }
        public static string? NameContent { get => nameContent; set => nameContent = value; }
        public static string? PhoneContent { get => phoneContent; set => phoneContent = value; }
        public static string? AddressContent { get => addressContent; set => addressContent = value; }
        public static bool GlobalFlag { get => globalFlag; set => globalFlag = value; }
        #endregion
 
        public Frm_Child()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 添加
        /// </summary>
        private void Button1_Click(object? sender, EventArgs e)
        {
            GlobalFlag = true;                          //设定标识的值为true
            if (!(comboBox1.Items.Equals(idContent)))   //当Combobox控件中不存在将添加的信息时
            {
                comboBox1.Items.Add(idContent!);        //在Combobox控件中添加一条记录
            }
            UpdateData();
        }
        /// <summary>
        /// 清空
        /// </summary>
        private void Button2_Click(object? sender, EventArgs e)
        {
            Record_ID.Clear();      //清空编号文本框中的内容
            Record_Name.Clear();    //清空姓名文本框中的内容
            Record_Phone.Clear();   //清空电话号码文本框中的内容
            Record_Address.Clear(); //清空居住地址文本框中的内容
            Record_ID.Focus();      //设定当前鼠标的焦点在编号文本框中
        }
        /// <summary>
        /// 删除
        /// </summary>
        private void Button3_Click(object? sender, EventArgs e)
        {
            GlobalFlag = false;             //设定全局变量表示为false
            if (comboBox1.Items.Count > 1)  //当ComboBox中剩不小于2条内容时
            {
                DeleteID = comboBox1.SelectedItem!.ToString();  //将选中项转化为int型
                if (comboBox1.Items.Count != 0)                 //当ComboBox中剩1条内容时
                {
                    comboBox1.Items.Remove(comboBox1.SelectedItem);
                    comboBox1.SelectedIndex = 0;
                }
            }
            UpdateData(); 
        }
        /// <summary>
        /// 保存新添加记录的编号
        /// </summary>
        private void Record_ID_TextChanged(object? sender, EventArgs e)
        {
            idContent = Record_ID.Text;
        }
        /// <summary>
        /// 保存填入的姓名
        /// </summary>
        private void Record_Name_TextChanged(object? sender, EventArgs e)
        {
            nameContent = Record_Name.Text;
        }
        /// <summary>
        /// 保存填入的电话号码
        /// </summary>
        private void Record_Phone_TextChanged(object? sender, EventArgs e)
        {
            phoneContent = Record_Phone.Text;
        }
        /// <summary>
        /// 保存填入的地址信息
        /// </summary>
        private void Record_Address_TextChanged(object? sender, EventArgs e)
        {
            addressContent = Record_Address.Text;
        }
        /// <summary>
        /// 循环遍历数组中的每一个元素,向Combobox控件中添加内容
        /// 默认设定当前选中项的索引为0
        /// </summary>
        private void Frm_Child_Load(object? sender, EventArgs e)
        {
            for (int i = 0; i < Frm_Main.IDArray!.Length; i++)
            {
                comboBox1.Items.Add(Frm_Main.IDArray[i].ToString());
                comboBox1.SelectedIndex = 0;
            }
        }
        /// <summary>
        /// 设定该值为false表示可以创建新窗体
        /// </summary>
        private void Frm_Child_FormClosing(object? sender, FormClosingEventArgs e)
        {
            Frm_Main.Flag = false; 
        }
       
        /// <summary>
        /// 更新DataGridView控件中的内容
        /// </summary>
        protected void UpdateData()
        {
            UpdateDataGridView?.Invoke(this, EventArgs.Empty);
   javascript     }
    }
}