c#中数据视图的行数

我有一个表在我的datagridview和我在相同的形式动态创建的文本框。我想知道我的列数和行数但它的值总是显示0

        int j = dmrc.dataGridView2.Rows.Count;
        int k = dmrc.dataGridView2.ColumnCount; 
        for (int i = 0; i<=j+2; i++)
        {
            TextBox txtRun = new TextBox();
            txtRun.Name = "tb"+i;
            txtRun.Location = new System.Drawing.Point(20 , 18 +(25*i));
            txtRun.Size = new System.Drawing.Size(100, 25);
            this.Controls.Add(txtRun);
        }
        for (int i = 0; i <= j+2; i++)
        {
            TextBox txtRun = new TextBox();
            txtRun.Name = "tb" +i;
            txtRun.Location = new System.Drawing.Point(150, 18 + (25* i));
            txtRun.Size = new System.Drawing.Size(100, 25);
            txtRun.Text = Convert.ToString(j); 
            this.Controls.Add(txtRun);
        }

在此之前，我已经创建了一个OleDB连接来导入EXCEL文件

试{

            DataGridView dataGridview2 = new DataGridView();
            dmrc dmrc = new dmrc();
            string pathconn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path.Text + "; Extended Properties='"Excel 8.0;HDR=Yes;'";";
            OleDbConnection conn = new OleDbConnection(pathconn);
            OleDbDataAdapter mydata = new OleDbDataAdapter("Select * from [" + sheet.Text + "$]", conn);
            DataTable dt = new DataTable();
            mydata.Fill(dt);


            dmrc.dataGridView2.DataSource = dt;
            dmrc.Show();

            int j = dmrc.dataGridView2.Rows.Count;
                for (int i = 0; i < j ; i++)
                {

                    string StrQuery = "INSERT INTO " + textBox1.Text + " VALUES ('" + dmrc.dataGridView2.Rows[i].Cells[0].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[1].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[2].Value + "' , '" + dmrc.dataGridView2.Rows[i].Cells[3].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[4].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[5].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[6].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[7].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[8].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[9].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[10].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[11].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[12].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[13].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[14].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[15].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[16].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[17].Value + "','" + dmrc.dataGridView2.Rows[i].Cells[18].Value + "');";
                    try
                    {
                        string myConne = "datasource=localhost;database=dmrc;port=3306;username=root;password=root";
                        MySqlConnection conne = new MySqlConnection(myConne);
                        conne.Open();
                        using (MySqlCommand comm = new MySqlCommand(StrQuery, conne))
                        {
                            comm.ExecuteNonQuery();
                        }
                        conne.Close();
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }

在这个按钮中显示行。COUNT工作正常，但不是在前一个