Simple Excel 2007 Data Loader to SQL 2008 Server

Introduction

This is a very simple Excel 2007 data loader to SQL 2008 database. I am using SqlBulkCopy class to make data load fast. (10K record loaded in less than 3s).

One catch: You will need existing table in SQL DB with matching columns. I skipped dynamic table creation to keep the code simple.

Using the Code

This is the most basic version, without error checking to make the code clear. Below is the completed code behind the form.

Button 1 - Opens the Excel file.

Button 2 - Uploads data to SQL Server.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Data.SqlClient;

namespace SimpleExcelLoader
{
    public partial class Form1 : Form
    {
        string filename="";
        public Form1()
        {
            InitializeComponent();
        }
      private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.InitialDirectory = "c:\\";
            openFileDialog1.Filter = "Excel 2007 files 
			(*.xlsx)|*.xlsx|All files (*.*)|*.*";
            openFileDialog1.FilterIndex = 2;
            openFileDialog1.RestoreDirectory = true;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
               filename = openFileDialog1.FileName;
               textBox1.Text = filename;
               button2.Enabled = true;
               toolStripStatusLabel1.Text = "File Selected. 
				Enter DB Info and click Upload Data";
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            string server = textBox2.Text;
            string db = textBox3.Text;
            string user = textBox4.Text;
            string pass = textBox5.Text;
            string tableName=textBox6.Text;
            string serverConnectionString="Server="+server+";
			Database="+db+";Uid="+user+";Pwd="+pass+";";
            
            
            //step 1
            // Load Excel data into DataTable
            string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;
            Data Source=" + filename + ";Extended Properties='Excel 12.0;HDR=YES;'";
            string strSQL = "SELECT * FROM [Sheet1$]";
            OleDbConnection excelConnection = new OleDbConnection(connectionString);
            excelConnection.Open(); // This code will open excel file.
            OleDbCommand dbCommand = new OleDbCommand(strSQL, excelConnection);
            OleDbDataAdapter dataAdapter = new OleDbDataAdapter(dbCommand);
            // create data table
            DataTable dTable = new DataTable();
            //fill table with Excel data
            dataAdapter.Fill(dTable);
           
            //step 2 
            //connect to server
            
            using (SqlConnection destinationConnection =
                   new SqlConnection(serverConnectionString))
                {                   
                    destinationConnection.Open();   
             
                    using (SqlBulkCopy bulkCopy =
                            new SqlBulkCopy(destinationConnection))
                    {
                        //Destination Table must match columns in Excel sheet
                        bulkCopy.DestinationTableName = tableName;
                                              
                        try
                        {
                            // Write from the source to the destination.
                            bulkCopy.WriteToServer(dTable);
                            toolStripStatusLabel1.Text="Data Uploaded";
                        }                                                  
                        catch (Exception ex)
                        {                           
                            toolStripStatusLabel1.Text=ex.Message;
                        }
                       
                     destinationConnection.Close(); }}
    
                // dispose used objects
                dTable.Dispose();
                dataAdapter.Dispose();
                dbCommand.Dispose();
                excelConnection.Close();
                excelConnection.Dispose();
            }}}