private string[,] LoadCsv(string filename)
    {

        string whole_file = File.ReadAllText(filename);

        whole_file = whole_file.Replace('n', 'r');
        string[] lines = whole_file.Split(new char[] { 'r' },
            StringSplitOptions.RemoveEmptyEntries);

        int num_rows = lines.Length;
        int num_cols = lines[0].Split(',').Length;

        string[,] values = new string[num_rows, num_cols];

        for (int r = 0; r < num_rows; r++)
        {
            string[] line_r = lines[r].Split(',');
            for (int c = 0; c < num_cols; c++)
            {
                values[r, c] = line_r[c];
            }
        }

        return values;

            string[,] values = LoadCsv(textBox2.Text);
            int num_rows = values.GetUpperBound(0) + 1;
            int num_cols = values.GetUpperBound(1) + 1;

            dgvValues.Columns.Clear();
            for (int c = 0; c < num_cols; c++)
                dgvValues.Columns.Add(values[0, c], values[0, c]);

            for (int r = 1; r < num_rows; r++)
            {
                dgvValues.Rows.Add();
                for (int c = 0; c < num_cols; c++)
                {
                    dgvValues.Rows[r - 1].Cells[c].Value = values[r, c];
                }
            }