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I have code to read excel file and save them into dataset.
Now I need to read 3 excel files like this and I need to compare the message ID in the 3 excel files,for the common message ID.

I am attaching a image to show how my data in dataset looks like

Is it better to convert the table of message ID to list<t> before doing it?

using System;

using System.Data;
using System.Data.OleDb;
using System.Collections.Generic;
using System.Text;

namespace Excelcalling1
	class Program
		static void Main(string[] args)
			string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;
					Data Source=E:\SheetForTest.xls;Integrated Security=SSPI;
					Extended Properties=Microsoft Excel 11.0 Object Library";

			//Create the connection

			System.Data.OleDb.OleDbConnection ExcelConnection =
			new System.Data.OleDb.OleDbConnection

			//create a string for the query

			string ExcelQuery;

			//Sheet1 is the sheet name
			//create the query:
			//read column with heading A from the Excel file

			ExcelQuery = "Select A from [Sheet1$]"; // from Sheet1";

			//use "Select * ... " to select the entire sheet
			//create the command

			System.Data.OleDb.OleDbCommand ExcelCommand = new System.Data.OleDb.OleDbCommand(ExcelQuery, ExcelConnection);

			//Open the connection

			catch (OleDbException e)
				string errorMessages = "";

				for (int i = 0; i < e.Errors.Count; i++)
					errorMessages += "Index #" + i + "\n" +
									 "Message: " + e.Errors[i].Message + "\n" +
									 "NativeError: " + e.Errors[i].NativeError + "\n" +
									 "Source: " + e.Errors[i].Source + "\n" +
									 "SQLState: " + e.Errors[i].SQLState + "\n";

				System.Diagnostics.EventLog log = new System.Diagnostics.EventLog();
				log.Source = "My Application";
				Console.WriteLine("An exception occurred. Please contact your system administrator.");

			//Create a reader

			System.Data.OleDb.OleDbDataReader ExcelReader;
			ExcelReader = ExcelCommand.ExecuteReader();

			//For each row after the first
			//Message box the values in the first column i.e. column 0

			while (ExcelReader.Read())
				Console.WriteLine("value retrieved!!");


ZurdoDev 26-Nov-13 7:44am    
Where are you stuck?
Member 10408451 26-Nov-13 7:48am    
This is the code to read a excel file and save the data of one excel file into data table.
I need to read multiple excel files and compare particular data in the excel files.
How can I do that?
Richard MacCutchan 26-Nov-13 9:02am    
Read each sheet in turn, extract the value(s) you are interested in and then compare the different sets.

1 solution

Steps to do:

  1. define the collection of files
  2. loop through the collection of files
  3. create destination DataTable[^] object

    • inside a loop create temporary DataTable and use Load[^] method to fullfill DataTable object with data
    • finally, use Merge[^] method to merge temporary DataTable with the destination DataTable

  4. compare data

That's all ;)
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