Unable to read excel sheet data on server to database - asp.net

Question

In my web based project I need to upload an excel sheet and store the data in database. The code works fine on my local machine.
However when I try to execute same code on server the data of the
excel sheet doesn't get stored in my database.
I have given relevant folder permission on server.
foreach (string s in Request.Files)
{
HttpPostedFile file = Request.Files[s];
int fileSizeInBytes = file.ContentLength;
string fileName = file.FileName;
string fileExtension = "";
if (!string.IsNullOrEmpty(fileName))
fileExtension = Path.GetExtension(fileName);
savedFileName = Guid.NewGuid().ToString() + fileExtension;
filename = Server.MapPath("~/Stockfiles/") + savedFileName;
// Place your code here to save information in database.
// Save the stream to disk
file.SaveAs(filename);
string conString = string.Empty;
switch (fileExtension)
{
case ".xls": //Excel 97-03
conString = ConfigurationManager.ConnectionStrings["Excel03ConnStringDb1"].ConnectionString;
break;
case ".xlsx": //Excel 07 or higher
conString = ConfigurationManager.ConnectionStrings["Excel07+ConnStringDb1"].ConnectionString;
break;
}
conString = string.Format(conString, filename);
using (OleDbConnection excel_con = new OleDbConnection(conString))
{
OleDbCommand cmd = null;
excel_con.Open();
string sheet1 = excel_con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null).Rows[0]["TABLE_NAME"].ToString();
DataTable dtExcelData = new DataTable();
//[OPTIONAL]: It is recommended as otherwise the data will be considered as String by default.
dtExcelData.Columns.AddRange(new DataColumn[3] { new DataColumn("PhoneIMEI", typeof(string)),
new DataColumn("PhonePrice",typeof(string)),new DataColumn("barcode",typeof(string))});
using (OleDbDataAdapter oda = new OleDbDataAdapter("SELECT * FROM [" + sheet1 + "]", excel_con))
{
oda.Fill(dtExcelData);
}
excel_con.Close();
string consString = ConfigurationManager.ConnectionStrings["ConnStringDb1"].ConnectionString;
using (SqlConnection con = new SqlConnection(consString))
{
con.Open();
using (SqlTransaction sqlTransaction = con.BeginTransaction())
{
using (SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(con, SqlBulkCopyOptions.Default, sqlTransaction))
{
//Set the database table name
sqlBulkCopy.DestinationTableName = "dbo.Stock ";
//[OPTIONAL]: Map the Excel columns with that of the database table
//sqlBulkCopy.ColumnMappings.Add("Id", "PersonId");
sqlBulkCopy.ColumnMappings.Add("PhoneIMEI", "PhoneIMEI");
sqlBulkCopy.ColumnMappings.Add("PhonePrice", "PhonePrice");
sqlBulkCopy.ColumnMappings.Add("barcode", "barcode");
try
{
sqlBulkCopy.WriteToServer(dtExcelData);
//SqlCommand getcount = new SqlCommand("select count(*) from dbo.Stock ", con);
sqlTransaction.Commit();
con.Close();
//file.SaveAs(filename);
}
Web.Config Code
<connectionStrings>
<add name="Excel03ConnStringDb1" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=YES'" />
<add name="Excel07+ConnStringDb1" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR=YES'" />
</connectionStrings>