Работа с DataGridView

namespace Task1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'northwindDataSet.Products' table. You can move, or remove it, as needed.
            this.productsTableAdapter.Fill(this.northwindDataSet.Products);
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            DataRowView newProd = (DataRowView)this.productsBindingSource.AddNew();
            this.dataGridView1.Rows.Add();
            Form2 frm = new Form2();
            frm.Edit_Product(productsBindingSource);
            frm.ShowDialog();
        }
 
        private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            Form2 f1edit = new Form2();
            f1edit.Edit_Product(productsBindingSource);
            f1edit.ShowDialog();
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            productsTableAdapter.Update(this.northwindDataSet.Products);
        }
 
        private void button3_Click(object sender, EventArgs e)
        {
            int index = dataGridView1.CurrentRow.Index;
 
            if (index != -1)
            {
                try
                {
                    dataGridView1.Rows.RemoveAt(index);
                }
                catch
                {
                    MessageBox.Show("База ПУСТА!!!", "Сообщение о базе", MessageBoxButtons.OK, MessageBoxIcon.Hand);
                }
            }
        }
    }
}

namespace Task1
{
    public partial class Form2 : Form
    {
        BindingSource productsBindingSource;
 
        public Form2()
        {
            InitializeComponent();
        }
 
        public void Edit_Product(BindingSource productsBindingSource)
        {
            this.productsBindingSource = productsBindingSource;
            this.textBox1.DataBindings.Add("Text", productsBindingSource, "ProductName");
            this.checkBox1.DataBindings.Add("Checked", productsBindingSource, "Discontinued");
            this.textBox2.DataBindings.Add("Text", productsBindingSource,"SupplierID" );
            this.textBox3.DataBindings.Add("Text", productsBindingSource, "CategoryID");
            this.textBox4.DataBindings.Add("Text", productsBindingSource, "QuantityPerUnit");
            this.textBox5.DataBindings.Add("Text", productsBindingSource, "UnitPrice");
            this.textBox6.DataBindings.Add("Text", productsBindingSource, "UnitsInStock");
            this.textBox7.DataBindings.Add("Text", productsBindingSource, "UnitsOnOrder");
      
        }
 
 
        private void button1_Click_1(object sender, EventArgs e)
        {
            productsBindingSource.CancelEdit();
            Close();
        }
    }
}

 private void button1_Click(object sender, EventArgs e)
        {
            DataRowView newProd = (DataRowView)this.productsBindingSource.AddNew();
            DataRow newRow = northwindDataSet.Tables["Products"].NewRow();
            newRow["ProductName"] = "Наименование";
            newRow["Discontinued"] = false;
            northwindDataSet.Tables["Products"].Rows.Add(newRow);
            Form2 f1edit = new Form2();
            f1edit.Edit_Product(productsBindingSource);
            f1edit.ShowDialog();
        }

 private void button1_Click(object sender, EventArgs e)
        {
            DataRowView newProd = (DataRowView)this.productsBindingSource.AddNew();
            DataRow newRow = northwindDataSet.Tables["Products"].NewRow();
            newRow["ProductName"] = "Наименование";
            newRow["Discontinued"] = false;
            northwindDataSet.Tables["Products"].Rows.Add(newRow);
        }