Datagrid to datatable

public DataTable DataGridView2DataTable(DataGridView dgv, String tblName, int minRow=0)
{
  DataTable dt = new DataTable(tblName);
        
  // 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;
}