conn.Open(); OleDbCommand cmd = new OleDbCommand("SELECT [Region], SUM([Amount]) FROM [Sheet1$] GROUP BY [Region]", conn); OleDbDataReader reader = cmd.ExecuteReader(); while (reader.Read())
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Data\CSVFiles\;Extended Properties="text;HDR=Yes;FMT=Delimited"; using System.Data.OleDb; string connString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Data\Sales.xlsx;Extended Properties='Excel 12.0 Xml;HDR=YES;'"; microsoft access database engine
Understand its quirks, respect its bitness, and the Access Database Engine will serve you faithfully as the silent bridge between your data islands. OleDbCommand cmd = new OleDbCommand("SELECT [Region]
In the sprawling ecosystem of Microsoft data technologies, certain components work so effectively behind the scenes that they often go unnoticed until something breaks. The Microsoft Access Database Engine (formerly known as the Jet Red engine, and later the Access Connectivity Engine or ACE) is precisely such a component. SUM([Amount]) FROM [Sheet1$] GROUP BY [Region]"
using (OleDbConnection conn = new OleDbConnection(connString))
Legacy systems, Windows-only automation, and rapid internal tools that need to query Excel or Access without overhead.
Console.WriteLine($"reader[0]: reader[1]");