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convert datagridview to datatable in csharp.net

here is the code:

  public DataTable DataGridView2DataTable(DataGridView dgv, int minRow = 0)
        {

            DataTable dt = new DataTable();

            // Header columns
            foreach (DataGridViewColumn column in dgv.Columns)
            {
                DataColumn dc = new DataColumn(column.Name.ToString());
                dt.Columns.Add(dc);
            }

            // Data cells
            for (int i = 0; i < dgv.Rows.Count; i++)
            {
                DataGridViewRow row = dgv.Rows[i];
                DataRow dr = dt.NewRow();
                for (int j = 0; j < dgv.Columns.Count; j++)
                {
                    dr[j] = (row.Cells[j].Value == null) ? "" : row.Cells[j].Value.ToString();
                }
                dt.Rows.Add(dr);
            }

            // Related to the bug arround min size when using ExcelLibrary for export
            for (int i = dgv.Rows.Count; i < minRow; i++)
            {
                DataRow dr = dt.NewRow();
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    dr[j] = "  ";
                }
                dt.Rows.Add(dr);
            }
            return dt;
        }

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