how to make insert value checkbox in datagrideview to database sql server

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C#

hi
i have problem to add value checkbox in datagridview to database sql server and type of data filed (bit) in database

for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
               {


 cmd.CommandText = "insert into acountment (done,partial,donot)values (Boolean.Parse(dataGridView1.Rows[i].Cells[11].Value.ToString()) + "', '" + Boolean.Parse(dataGridView1.Rows[i].Cells[12].Value.ToString()) + "', '" + Boolean.Parse(dataGridView1.Rows[i].Cells[13].Value.ToString()) + "')";
                   cnn.Open();
                   cmd.ExecuteNonQuery();

                   cnn.Close();

               }