users name their sheets all sorts of crazy things, but sometimes, I want to be able to get the sheet names regardless of what they are named

Considering that I already have my ConnectionString strC set up to access my Excel file, I can just use the GetOleDbSchemaTable method like this:

DataTable dtS;
using (OleDbConnection c = new OleDbConnection(strC))
{
  c.Open();
  dtS = c.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, 
    new object[] { null, null, null, "TABLE" });
  c.Close();
}

Now dtSchema holds the sheet names (in alphabetical order). To get them out:

foreach(DataRow row in dtS.Rows)
  Console.WriteLine(row.Field<string>("TABLE_NAME"));