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private void Form1_Load(object sender, EventArgs e)
        {
            DataGridViewRow row1 = new DataGridViewRow();
            row1.CreateCells(dataGridView1);
            row1.Cells[0].Value = "Hallo1";
            dataGridView1.Rows.Add(row1);
            DataGridViewRow row2 = new DataGridViewRow();
            row2.CreateCells(dataGridView1);
            row2.Cells[0].Value = "Hallo2";
            dataGridView1.Rows.Add(row2);
            DataGridViewRow row3 = new DataGridViewRow();
            row3.CreateCells(dataGridView1);
            row3.Cells[0].Value = "Hallo3";
            dataGridView1.Rows.Add(row3);
        }					

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private void button1_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                MessageBox.Show(row.Cells[0].Value.ToString()); // Objektinstanz bei editierter Zelle ist leider weg
            }
        }