错误：方法“ToString”没有重载需要 1 arguments

Question

I want to insert all DataGridView rows to Database. I faced this error

No overload for method "ToString" takes 1 arguments.

 for (int i = 0; i < TimesDgv.Rows.Count - 1; i++)
 {
      OleDbCommand cmd = new OleDbCommand("Insert into TimesTBL(PeriodName,TimeFrom,TimeTo,Duration) values (@PeriodName,@TimeFrom,@TimeTo,@Duration)", con);
      cmd.Parameters.AddWithValue("PeriodName", TimesDgv.Rows[i].Cells[0].Value);
      cmd.Parameters.AddWithValue("TimeFrom", TimesDgv.Rows[i].Cells[1].Value.ToString("hh:mm"));
      cmd.Parameters.AddWithValue("TimeTo", TimesDgv.Rows[i].Cells[2].Value.ToString("hh:mm"));
      cmd.Parameters.AddWithValue("Duration", TimesDgv.Rows[i].Cells[3].Value);
      con.Open();
      cmd.ExecuteNonQuery();
      con.Close();
      cmd = null;
  }

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Answer 1

You seem to think that TimesDgv.Rows[i].Cells[1].Value is a DateTime or TimeSpan . But it's not. Not as far as your compiler is concerned.

Maybe you meant to Parse or Cast it into one?