public void ClearRowColumnBlockCandidates(int v)
{
SudokuRow row = Sudoku.Rows[j];
row.ClearCandidate(v);
SudokuColumn col = Sudoku.Columns[i];
col.ClearCandidate(v);
SudokuBlock block = Sudoku.GetBlock(i, j);
block.ClearCandidate(v);
}