Multiple Excel Files to Upload

Question

Hi

  I have below code & i want to upload multiple Excel Files

<div class="col-lg-12">
                                                <asp:FileUpload ID="FileUpload1" runat="server" class="file-input" multiple="multiple" data-show-caption="true" data-show-preview="true" accept=".xlsx,.xls,.csv" />
                                                <asp:RegularExpressionValidator ID="regexValidator" runat="server" ForeColor="Red" ControlToValidate="FileUpload1" ErrorMessage="Only Excel files are allowed" ValidationExpression="^.*\.(xls|xlsx|csv)$"></asp:RegularExpressionValidator>
                                            </div>

protected void btnUploadSave_Click(object sender, EventArgs e)
        {
            try
            {

                if (FileUpload1.HasFile)
                {
                    string FileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
                    string RandomName = Utility.CurrentDateTime().ToFileTime().ToString();
                    string Extension = Path.GetExtension(FileUpload1.PostedFile.FileName);
                    string FolderPath = "~/Upload/ExcelUpload/";
                    string FilePath = Server.MapPath(FolderPath + RandomName + FileName);

                    FileUpload1.SaveAs(FilePath);

                    if (Extension.ToLower() == ".csv")
                    {
                        UploadSave(Utility.ReadCSVFileNew(FilePath));
                    }
                    else
                    {
                        UploadSave(Utility.ReadExcelFile(FilePath));
                    }

                    divUpload.Style.Add("display", "none");
                    btnUploadSave.Style.Add("display", "none");

                    if (myDataTable0.Rows.Count == 0)
                    {
                        ShowMessageWithRedirect(recno.ToString(), " Leads Uploaded Successfully", "success", "ViewOpenLeads");
                    }
                    else
                    {
                        ShowMessage(recno.ToString() + " Leads Uploaded Successfully", myDataTable0.Rows.Count + " Duplicate Leads Found", "info");
                    }
                }
            }
            catch (Exception ex)
            {
                Utility.SaveErrorLog(ex.Message, System.IO.Path.GetFileName(Request.Path), System.Reflection.MethodBase.GetCurrentMethod().Name, Convert.ToInt32(hdfBDOID.Value));
                ShowMessage("Oops...", ex.Message, "error");
            }
        }

Thanks