Article 3: Create new document sets and upload document using webpart

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using System;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Collections;

using Microsoft.Office.DocumentManagement.DocumentSets;//Add reference

using Microsoft.SharePoint;

using System.IO;

namespace SPTWPNewPurchaseRQ.SPTWPNewPurchaseRQ

{

    public partial class SPTWPNewPurchaseRQUserControl : UserControl

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            txtDateRequest.Text = DateTime.Now.ToShortDateString();

        }

        protected void btnSave_Click(object sender, EventArgs e)

        {

            if (txtTitle.Text != "")

            {

                SPWeb spWeb = SPContext.Current.Web;

                String documentLibraryName = @"PurchaseRequest";//   

                SPList purchaseRequest = spWeb.Lists["PurchaseRequest"];

                SPContentType documentSetContentType = purchaseRequest.ContentTypes["FinanceDoc"];//FinanceDoc name of Content Type

                //Declare to get File Name

                string documentSetName = txtTitle.Text;

                //Declare Hashtable

                Hashtable properties = new Hashtable();

                properties.Add("DocumentSetDescription", txtDescription.Text);//DocumentSetDescription => InternalName

                properties.Add("Date1", txtDateRequest.Text);

                properties.Add("DepartmentRequest", ddlDepartment.SelectedValue.ToString());

                properties.Add("Total", txtTotal.Text);

                SPFolder parentFolder = purchaseRequest.RootFolder;

                //Create new Document sets

                DocumentSet.Create(parentFolder, documentSetName, documentSetContentType.Id, properties, true);

                //Declare to upload file to document set, only run on IE

                String fullPathFileName = fileUpload1.PostedFile.FileName;

                //Check file is exists?

                if (!System.IO.File.Exists(fullPathFileName))

                    throw new FileNotFoundException("File not found.", fullPathFileName);

                //Declare path to document set

                SPFolder myLibraryToUploadDocument = spWeb.Folders[documentLibraryName].SubFolders[txtTitle.Text];

                // Prepare to upload

                Boolean replaceExistingFiles = true;

                String fileName = System.IO.Path.GetFileName(fullPathFileName);

                FileStream fileStream = File.OpenRead(fullPathFileName);

                // Upload document

                SPFile spfile = myLibraryToUploadDocument.Files.Add(fileName, fileStream, replaceExistingFiles);

                // Commit

                myLibraryToUploadDocument.Update();

                //web.GetFile(web.Url + "/" + destinationFolderUrl + file.Name);

            }

        }

    }

}