请教大家怎样使用datatable中已有的事件?C# 中怎么没反应?

C# code

namespace WindowsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // Put the next line into the Declarations section.
        private System.Data.DataSet dataSet;

        private void MakeDataTables()
        {
            MakeParentTable();
            BindToDataGrid();
        }

        private void MakeParentTable()
        {
            // Create a new DataTable.
            System.Data.DataTable table = new DataTable("ParentTable");


            table.TableNewRow += new DataTableNewRowEventHandler(table_TableNewRow);
            // Declare variables for DataColumn and DataRow objects.
            DataColumn column;
            DataRow row;

            // Create new DataColumn, set DataType, 
            // ColumnName and add to DataTable.    
            column = new DataColumn();
            column.DataType = System.Type.GetType("System.Int32");
            column.ColumnName = "id";
            column.ReadOnly = false;
            column.Unique = true;
            // Add the Column to the DataColumnCollection.
            table.Columns.Add(column);

            // Create second column.
            column = new DataColumn();
            column.DataType = System.Type.GetType("System.String");
            column.ColumnName = "ParentItem";
            column.AutoIncrement = false;
            column.Caption = "ParentItem";
            column.ReadOnly = false;
            column.Unique = false;
            // Add the column to the table.
            table.Columns.Add(column);

            // Make the ID column the primary key column.
            DataColumn[] PrimaryKeyColumns = new DataColumn[1];
            PrimaryKeyColumns[0] = table.Columns["id"];
            table.PrimaryKey = PrimaryKeyColumns;

            // Instantiate the DataSet variable.
            dataSet = new DataSet();
            // Add the new DataTable to the DataSet.
            dataSet.Tables.Add(table);

            // Create three new DataRow objects and add 
            // them to the DataTable
            for (int i = 0; i <= 2; i++)
            {
                row = table.NewRow();
                row["id"] = i;
                row["ParentItem"] = "ParentItem " + i;
                table.Rows.Add(row);
            }
        }
        private void BindToDataGrid()
        {
            // Instruct the DataGrid to bind to the DataSet, with the 
            dataGridView1.DataSource = this.dataSet.Tables[0];
 
        }
        void table_TableNewRow(object sender, DataTableNewRowEventArgs e)
        {
            MessageBox.Show("hello");
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            this.MakeDataTables();
        }




    }
}

C# code

{
            DataTable dt = new DataTable();
            dt.Columns.Add(new DataColumn("id"));
            dt.Columns.Add(new DataColumn("name"));

            DataRow dr = null;
            dr = dt.NewRow();
            dr["id"] = "001";
            dr["name"] = "Name1";
            dt.Rows.Add(dr);
            dr = dt.NewRow();
            dr["id"] = "002";
            dr["name"] = "Name2";
            dt.Rows.Add(dr);

            dt.TableNewRow += new DataTableNewRowEventHandler(dt_NewTableRow);

            dataGridView1.DataSource = dt;
}

protected void dt_NewTableRow(Object sender, DataTableNewRowEventArgs e)
        {
            MessageBox.Show("hello");
        }