Question

my command is something like this:

string command = "SELECT * FROM [SheetName1$]; SELECT * FROM [SheetName2$]; ...."

When I do

  DataSet set = new DataSet();
  using(OleDbDataAdapter adapter = new OleDbDataAdapter(command, connection))
  {
     adapter.Fill(ds)
  }

I end up with an empty DataSet (more specifically I end up with an exception that says Characters found after end of SQL statement). However, if I use only one SELECT query this works fine.

Answer 1

Excel cannot execute more than in one statement. Try making this in two commands.

DataSet set1 = new DataSet();
using(OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [SheetName1$];", connection))
{
   adapter.Fill(set1 );
}

DataSet set2 = new DataSet();
using(OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [SheetName2$];", connection))
{
   adapter.Fill(set2);
}