How to insert data using SqlBulCopy.

protected void btnsave_Click(object sender, EventArgs e)
        {
            if (FileUpload.HasFile)
            {                
                importDataFromExcel(FileUpload.PostedFile.FileName);
            }
        }

        public void importDataFromExcel(string excelFilePath)
        {
            //Declare Variables - Edit these based on your particular situation
            string sSQLTable = "dbo.Import_SFS";
            // make sure your sheet name is correct, here sheet name is Data, so you can change your sheet name if have different
            string myExcelDataQuery = "Select Brand,Region_ID,Account_Name from [Data$]";
            try
            {
                //Create our connection strings
                string sExcelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excelFilePath + ";Extended Properties=" + "\"Excel 8.0;HDR=YES;\"";

                string sSqlConnectionString = "Data Source=localhost;Initial Catalog=MDFW;Integrated Security=True";
                //Execute a query to erase any previous data from our destination table
                string sClearSQL = "DELETE FROM " + sSQLTable;
                SqlConnection SqlConn = new SqlConnection(sSqlConnectionString);
                SqlCommand SqlCmd = new SqlCommand(sClearSQL, SqlConn);
                SqlConn.Open();
                SqlCmd.ExecuteNonQuery();
                SqlConn.Close();
                //Series of commands to bulk copy data from the excel file into our SQL table
                OleDbConnection OleDbConn = new OleDbConnection(sExcelConnectionString);
                OleDbCommand OleDbCmd = new OleDbCommand(myExcelDataQuery, OleDbConn);
                OleDbConn.Open();
                OleDbDataReader dr = OleDbCmd.ExecuteReader();
                SqlBulkCopy bulkCopy = new SqlBulkCopy(sSqlConnectionString);
                bulkCopy.DestinationTableName = sSQLTable;
                while (dr.Read())
                {
                    bulkCopy.WriteToServer(dr);
                }
                OleDbConn.Close();
            }
            catch (Exception ex)
            {
                //handle exception
            }
        }