Csharp/CSharp Tutorial/ADO.Net/Excel

Connecting to a Microsoft Excel Workbook

using System;
using System.Data;
using System.Data.OleDb;
    class Program
    {
        static void Main(string[] args)
        {
            string[] oledbConnectString = new string[]
            {
                "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Category.xlsx;" +
                "Extended Properties=\"Excel 12.0;HDR=YES\";",
                "Provider=Microsoft.ACE.OLEDB.12.0;" +
                @"Data Source=Category.xls;" +
                "Extended Properties=\"Excel 8.0;HDR=YES\";"
             };
            foreach (string connectString in oledbConnectString)
            {
                OleDbConnection connection =new OleDbConnection(connectString);
                connection.Open(  );
                Console.WriteLine("Connection.String = {0}\n",connectString);
                Console.WriteLine("Connection.State = {0}",connection.State);
                Console.WriteLine("Connection.Provider = {0}",connection.Provider);
                Console.WriteLine("Connection.ServerVersion = {0}",connection.ServerVersion);
                connection.Close(  );
                
            }
        }
    }

Retrieving Data from a Microsoft Excel Workbook

using System;
using System.Data;
using System.Data.OleDb;
    class Program
    {
        static void Main(string[] args)
        {
            string oledbConnectString = "Provider=Microsoft.ACE.OLEDB.12.0;" +
                @"Data Source=..\Category.xlsx;" +
                "Extended Properties=\"Excel 12.0;HDR=YES\";";
            string commandText = "SELECT CategoryID, CategoryName, " +
                "Description FROM [Sheet1$]";
            OleDbConnection connection = new OleDbConnection(oledbConnectString);
            OleDbCommand command = new OleDbCommand(commandText, connection);
            connection.Open();
            OleDbDataReader dr = command.ExecuteReader( );
            while (dr.Read()){
                Console.WriteLine(dr["CategoryID"]);
                Console.WriteLine(dr["CategoryName"]);
                Console.WriteLine(dr["Description"]);
            }
            connection.Close( );
        }
    }