Get data from DataGridView

Question

Hello everyone.I have a problem with reading data from DataGridView to array. Use code: int[,] n = new int[3,19]; for (int i = 1; i <= StartDataView.Rows.Count; i++) { for (int j = 1; j <= StartDataView.Columns.Count; j++) { n[i - 1, j - 1] = (int)StartDataView.Rows[i].Cells[j].Value; } } but all values results is "null",I tried Value.ToString(),but also no result.What I do wrong?