how to Export/Import Excel data into SQL Server Database in asp.net using C#

In this web programming tutorial we will learn that how we can import export excel data in to sql server database in asp.net using c#. In certain occasions we may need to export / import large excel spreadsheet to SQL server database.
Step 1:
I am assuming you have created a folder and uploaded your Microsoft Excel worksheet in that folder.
Step 2:
You can create class for creating an export function:
code for .cs file

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.OleDb;
///

/// Class for Exporting Excel Data to SQL server
///

public class clsExcelToSqlServer
{
public clsExcelToSqlServer()
{
//
// TODO: Add constructor logic here
//
}
private string _FilePath;
public String FilePath
{
get { return _FilePath; }
set { _FilePath = value; }
}
public DataTable getDataFromExcelSheet()
{
try
{
//File path of Excel Spread sheet
FilePath = HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath) +
"/ExcelFolder/ExcelAppliance.xls";
//Connection string to connect Excel data
string strConnectionString = string.Empty; strConnectionString =
@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
+ FilePath + @";Extended Properties=""Excel 8.0;HDR=Yes;IMEX=1""";
OleDbConnection cnCSV = new OleDbConnection(strConnectionString);
cnCSV.Open();
//Selecting all rows from excel sheet
OleDbCommand cmdSelect = new OleDbCommand(@"SELECT * FROM [Sheet1$]", cnCSV);
OleDbDataAdapter daCSV = new OleDbDataAdapter();
daCSV.SelectCommand = cmdSelect;
DataTable dtCSV = new DataTable();
//Filling excel data into data table
daCSV.Fill(dtCSV);
cnCSV.Close();
daCSV = null;
return dtCSV;
}
catch (Exception ex)
{
return null;
}
finally { }
}
}

getDataFromExcelSheet() function returns a Data Table and you can use this Data table to export data into to SQL Server.