How to Convert the Excel File to DataGrid?

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C#

database

Hi to everybody.

I am using C#.net to convert Excel file to DataGrid for Client Request.

When I use the page to convert the excel to datagrid at localhost it works properly, but it will not work when I publish the site.

The error is
System.Data.OleDb.OleDbException: The Microsoft Jet database engine cannot open the file ''. It is already opened exclusively by another user, or you need permission to view its data.

The code is

protected void Upload_Click(object sender, EventArgs e)
        {
            try
            {
                strFileName = fleupForQuotation.PostedFile.FileName;
                if (strFileName.Trim() != "")
                {
                    string folderpath = "F://Upload//";
                    string attachedFile = fleupForQuotation.PostedFile.FileName;
                    if (Request.Browser.Browser == "IE")
                    {
                        fleupForQuotation.SaveAs(folderpath + fleupForQuotation.FileName);
                        strFileName = folderpath + fleupForQuotation.FileName;
                    }
                    else
                    {
                        fleupForQuotation.SaveAs(folderpath + attachedFile);
                        strFileName = folderpath + attachedFile;
                    }
                    hdnFileName.Value = strFileName;
                    

                }
                else
                {
                }
            }
            catch (Exception ex)
            {
                SRCMError.ErrorLog(ex.ToString());
                SRCMError.ExceptionToEventLog(ex);
            }


            
            string ConnectionString = "provider=Microsoft.Jet.OLEDB.4.0;" + @"data source=" + strFileName + ";" + "Extended Properties=Excel 8.0;";

            OleDbConnection conn = new OleDbConnection(ConnectionString);

            conn.Open();

            try
            {


                OleDbDataAdapter oda = new OleDbDataAdapter("select * from [Sheet1$]", conn);

                DataSet ds = new DataSet();

                oda.Fill(ds, "Details");

                grdExceltoGrid.DataSource = ds;

                grdExceltoGrid.DataBind();

            }

            catch (Exception ex)
            {

                Response.Write(ex.Message);

            }

            finally
            {

                conn.Close();

            }

        }

Please help me to solve this problem..

Thanks a lot