how To Update The DataGridview Data In DataBase In Winforms Using C#..?

Here Is My Code..With this In Datagridview Only The First Modified Record Only Updating..Remaining Records are not updating. But I need All The Modified Records Should Be Update pls help me. 

private void btnUpdate(object sender, EventArgs e)
{
using (OleDbConnection connect = new OleDbConnection(connectionString))
            {
                using (OleDbCommand command = new OleDbCommand())
                {
                    command.Connection = connect;
                    command.CommandText = "update customer set Name1=@name,Address=@address where Name1=@name";


                    command.Parameters.Add(new OleDbParameter("name", OleDbType.VarChar));
                    command.Parameters.Add(new OleDbParameter("address", OleDbType.VarChar));
                    connect.Open();
                    foreach (DataGridViewRow row in dataGridView1.Rows)
                    {
                        if (!row.IsNewRow)
                        {
                            command.Parameters["name"].Value = row.Cells[0].Value;
                            command.Parameters["address"].Value = row.Cells[1].Value;
                            command.ExecuteNonQuery();
                        }
                    }


                }
            }
}