Upload excel file content to SQl server using SQL bulk copy method

  protected void btnImport_Click(object sender, EventArgs e)
    {
        lblError.Visible = false;

        string xlsFile = fileImport.FileName;  //fileImport is the file upload control

        if (xlsFile == "" || xlsFile.EndsWith(".xls") != true)
        {
            lblError.Text = "Please select an Excel File";

            lblError.Visible = true;

            return;
        }
        
        string targetFileName = MapPath("~/_OrgData/Excel/" + xlsFile);

        fileImport.PostedFile.SaveAs(targetFileName);
                  
        string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + targetFileName + ";Extended Properties='Excel 4.0;HDR=YES;'";

        OleDbConnection xlsConn = new OleDbConnection(excelConnectionString);

        xlsConn.Open();

            try
            {
                OleDbCommand command = new OleDbCommand("Select * FROM [Sheet1$] WHERE Username <> NULL", xlsConn);

                DbDataReader dr = command.ExecuteReader();

                string sqlConnectionString = TAData.Common.GetConnectionString();

                using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString))
                {
                    bulkCopy.DestinationTableName = "tblPeopleTemp";

                    bulkCopy.ColumnMappings.Add("Username", "UserName");
                    bulkCopy.ColumnMappings.Add("Password", "Password");
                    bulkCopy.ColumnMappings.Add("Surname", "LName");
                    bulkCopy.ColumnMappings.Add("First Name", "FName");
                   
                    bulkCopy.WriteToServer(dr);
                }
            }
                
        catch (Exception ex)
        {
            lblError.Text = "The Excel content is not valid";
            
            lblError.Visible = true;
        }

        xlsConn.Close();

        File.Delete(targetFileName);
    }