C# Convert MS Excel column to utf-8 and then to base64 - excel

Question

I have a situation where I have to convert excel single column to utf-8 and then to base64. I have gone through several post which suggests how to read excel file.
Reading Excel files from C#
But I am not sure that in my situation which is the best approach.
I have big files of 2MB.
Kindly suggest me.

Answer 1

I got the solution
using System;
using System.Drawing;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
bgw.RunWorkerAsync();
var myConnection = new OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source='c:\\Language_Batch1_OneClick.xls';Extended Properties=Excel 8.0;"); ;
var myCommand = new OleDbCommand();
var upCommand = new OleDbCommand();
int i = 0;
try
{
string sql = null;
myConnection.Open();
myCommand.Connection = myConnection;
sql = "select ANSWER_CODE,Punjabi from [Batch_Lang_1$]";
myCommand.CommandText = sql;
var dataReader = myCommand.ExecuteReader();
while (dataReader.Read())
{
var langText = Convert.ToBase64String(Encoding.UTF8.GetBytes(dataReader["Punjabi"].ToString()));
if (langText.Length >= 1000)
{
continue;
}
var ansCode = dataReader["ANSWER_CODE"].ToString();
sql = "update [Batch_Lang_1$] set Punjabi= '" + langText + "' where ANSWER_CODE='" + ansCode + "'";
upCommand.Connection = myConnection;
upCommand.CommandText = sql;
upCommand.ExecuteNonQuery();
i++;
}
}
}
}