DataTable importRow() into empty table

Question

I've been trying to merge an excel document with many sheets into a Datatable so that I can display said sheet in my winform app.

From reading around, I figured that Datatable.import(DataRow row) is my best bet. Thus my code looks as follows:

DataTable returnSet = new DataTable();
foreach (DataTable datTab in ds.Tables) // ds is extracted excel sheets in a dataset
{
  foreach (DataRow datRow in datTab.Rows) 
  {
    if (datRow.IsNull(0)) //if empty first col go on to next sheet
    {
      break;
    }
    else
    {
      returnSet.ImportRow(datRow);
    }
  }
}

When debugging, it shows that datRow/datTab is what I expected it to be, however after each ImportRow, returnSet is still an empty 1x1 cell. Any insight as to what I am doing wrong / missing would be greatly appreciated.

Solution

I assume the reason is because your DataTable currently has no schema. You can try to clone the original DataTable to create the same schema(DataColumns etc).

foreach (DataTable datTab in ds.Tables) // ds is extracted excel sheets in a dataset
{
    DataTable tblClone = datTab.Clone();
    foreach (DataRow datRow in datTab.Rows) 
    {

        if (datRow.IsNull(0)) //if empty first col go on to next sheet
        {
            break;
        }
        else
        {
            tblClone.ImportRow(datRow);
        }
    }
}