Introduction:

A custom SharePoint list can be configured to collect any type of data and SharePoint automatically generates the forms for adding new items, editing items and viewing items.

Team Web site comes with a built-in List Calendar, Task, which is listed on the Quick Launch bar. A new custom list has to be created for storing the files.

Custom list created

Custom Column Creation

1. While creating custom list Named as FileList default column will create Title.
2. Modify column name Title as Filename.
3. Create one more column as Filedate.
4. Create one more column as FileSize.

Implementation of Web part

The files are added to the custom GridView (list) in web part level using browse file upload button. You can add and delete multiple files in this list. Finally all the files are uploaded in custom share point list Filelist using submit button in webpart.

The steps to create a web part

• Make sure installed VS.net 2005.
• Make sure installed Web part Project Library in your system.
• Start VS.Net 2005 and create a new project.
• Select Project Type as Visual C#-->SharePoint.
• Visual Studio Installed templates as Web Part.
• Change Name as MultipleUploadWebpart.
• Change Location as e:\ MultipleUploadWebpart.
• Change Solution name as FileUploadWebPart.

Using the Render method

The Web part base class seals the Render method of System.Web.UI.Control because the Web Part infrastructure needs to control rendering the contents of a Web Part. For this reason, custom Web Parts must override the Render method of the Web part base class.

#region File Information

///<summary>

/// ------------------------------------------------------------------------------------------------------

/// Namespace : MultipleFileUploadWebPart

///

/// Purpose   : To Create Webpart to programmatically upload MultipleFiles to Custom SharePoint List

///        

/// Change History

/// -------------------------------------------------------------------------------------------------------

/// Date            Edit            Author            Comment             

/// -------------+--------+-------------------------------------------------------------------------------

/// 12-July-2007    [100]          Saravanan_Gajendran     Create Webpart

/// -------------+--------+-------------------------------------------------------------------------------

///</summary>

using System;

using System.Runtime.InteropServices;

using System.Web.UI;

using System.Web;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Serialization;

using System.Data;

using System.IO;

using System.Text;

using System.Web.SessionState;

using Microsoft.SharePoint;

using Microsoft.SharePoint.WebControls;

using Microsoft.SharePoint.WebPartPages;

namespace MultipleUploadWebpart

{

     [Guid("2115a405-ff46-4040-8370-6e4fcb7b9194")]

     public class MultipleUploadWebpart : System.Web.UI.WebControls.WebParts.WebPart

     {

          #region Variables

          private HtmlInputFile inputFile;

          private Button btnUpload;

          private Label lblMessage;

          private GridView dgdUpload;

          private string fileName = "";

          private Button btnSubmit;

          private HyperLinkField hlnkFileName;        

          private BoundField bndFileSize;

          private BoundField bndFileKb;

          private ButtonColumn btnclmDelete;

          private CommandField cmdDelete;

          private double length;

          byte[] contents;

          DataTable dt;//datatable use for multiple file upload

          DataRow dr;//datarow use for multiple file upload

          DataColumn dc;//datacolumn use for multiple file upload

          double count = 0;//count of file size

          #endregion

          #region Create Child Control

          protected override void CreateChildControls()

          {

               #region inputfile

               this.inputFile = new HtmlInputFile();

               this.inputFile.ID = "_fileUpload";

               #endregion           

               #region message label

               this.lblMessage = new Label();

               this.lblMessage.ID = "_lblMessage";

               this.lblMessage.Text = "";
               #endregion
  
               #region  Button

               this.btnUpload = new Button();

               this.btnUpload.ID = "_btnUploadUpload";

               this.btnUpload.Text = "Upload";

               this.btnUpload.Click += new EventHandler(btnUploadUploadClick);

               this.btnSubmit = new Button();

               this.btnSubmit.ID = "_btnSubmit";

               this.btnSubmit.Text = "Submit";

               this.btnSubmit.Click += new EventHandler(btnSubmit_Click);

               #endregion

               #region GridView

               this.dgdUpload = new GridView();

               this.hlnkFileName = new HyperLinkField();

               this.hlnkFileName.DataTextField = "FileName";

               this.hlnkFileName.DataNavigateUrlFormatString = "FilePath";

               this.hlnkFileName.HeaderText = "FileName";

               this.bndFileSize = new BoundField();

               this.bndFileSize.HeaderText = "FileSize";

               this.bndFileSize.DataField = "FileSize";

               this.bndFileKb = new BoundField();

               this.bndFileKb.HeaderText = "";

               this.bndFileKb.DataField = "KB";

               this.cmdDelete = new CommandField();

               this.cmdDelete.HeaderText = "Delete";

               this.cmdDelete.ButtonType = ButtonType.Link;

               this.cmdDelete.InsertImageUrl = "delete.gif";

               this.cmdDelete.DeleteText = "Delete";

               this.cmdDelete.ShowDeleteButton = true;

               this.dgdUpload.ID = "_dgdFileUpload";

               this.dgdUpload.Columns.Add(hlnkFileName);

               this.dgdUpload.Columns.Add(bndFileSize);

               this.dgdUpload.Columns.Add(bndFileKb);

               this.dgdUpload.Columns.Add(cmdDelete);

               this.dgdUpload.AutoGenerateColumns = false;          

               this.dgdUpload.RowDeleting += new GridViewDeleteEventHandler
               (dgdUpload_RowDeleting);

               #endregion

               #region Add Controls

               this.Controls.Add(dgdUpload);

               this.Controls.Add(inputFile);
               this.Controls.Add(lblMessage);

               this.Controls.Add(btnUpload);

               this.Controls.Add(btnSubmit);

               base.CreateChildControls();

               #endregion

          }

          #endregion

          #region RowDeleting

          private void dgdUpload_RowDeleting(object sender, GridViewDeleteEventArgs e)

          {

               int recordToDelete= e.RowIndex;

               dt = (DataTable)Page.Session["Files"];

               int cn = dt.Rows.Count;

               dt.Rows.RemoveAt(recordToDelete);

               dt.AcceptChanges();
               Page.Session["Files"] = dt;
               this.dgdUpload.DataSource = dt
               this.dgdUpload.DataBind();

           }

           #endregion

           #region OnLoad

           protected override void OnLoad(EventArgs e)

           {

                base.OnLoad(e);

           }

           #endregion

           #region File in SharePoint List

           private void btnSubmit_Click(object sender, EventArgs e)

           {

                SPWeb site = SPContext.Current.Web;

                SPList list = site.Lists["FileList"];

                SPListItem myNewItem ;          

                dt = (DataTable)Page.Session["Files"];

                int _dtcnt = dt.Rows.Count;

                string strDate="";

                foreach (DataRow dr in dt.Rows)

            {

                 strDate = System.DateTime.Now.Date.TimeOfDay.ToString();

                 myNewItem = list.Items.Add();

                 fileName = dr["Filename"].ToString();              

                 string strFilepath= dr["FilePath"].ToString()

                 StreamReader sr = new StreamReader(strFilepath);

                 Stream fStream=sr.BaseStream ;               

                 contents = new byte[fStream.Length];

                 fStream.Read(contents, 0, (int)fStream.Length);

                 fStream.Close();

                 myNewItem["Filename"] = dr["Filename"].ToString();

                 myNewItem["FileSize"] = dr["FileSize"].ToString();

                 myNewItem["Filedate"] = strDate;

                 myNewItem.Attachments.Add(fileName, contents);

                 myNewItem.Update();

                 System.IO.File.Delete(strFilepath);

             }

             lblMessage.Text = "Sucessfully Submited";

             }

             #endregion

             #region Upload File Add in List

             protected void btnUploadUploadClick(object sender, EventArgs e)

             {

                  fileName = System.IO.Path.GetFileName(inputFile.PostedFile.FileName);

                  if (fileName != "")

             {

                  string _fileTime = DateTime.Now.ToFileTime().ToString();

                  string _fileorgPath =  System.IO.Path.GetFullPath
                  (inputFile.PostedFile.FileName);

                  string _newfilePath = _fileTime + "~" + fileName;

                  length = (inputFile.PostedFile.InputStream.Length) / 1024;

                  string tempFolder = Environment.GetEnvironmentVariable("TEMP");

                  string _filepath = tempFolder + _newfilePath;               

                  inputFile.PostedFile.SaveAs(_filepath);

                  AddRow(fileName, _filepath, length);

                  lblMessage.Text = "Successfully Added in List";

             }

             else
             {

                  lblMessage.Text="Select a File";

                  return;

             }

        }

        #endregion

        #region Render

        protected override void Render(HtmlTextWriter writer)

        {

             // TODO: add custom rendering code here.

             EnsureChildControls();

             this.inputFile.RenderControl(writer);

             this.btnUpload.RenderControl(writer);

             this.lblMessage.RenderControl(writer);

             this.dgdUpload.RenderControl(writer);

             this.btnSubmit.RenderControl(writer);

        }

        #endregion

        #region AddMoreRows for file upload

        private void AddMoreColumns()

        {

             dt = new DataTable("Files");

             dc = new DataColumn("FileName", Type.GetType("System.String"));

             dt.Columns.Add(dc);

             dc = new DataColumn("FilePath", Type.GetType("System.String"));

             dt.Columns.Add(dc);

             dc = new DataColumn("FileSize", Type.GetType("System.String"));

             dt.Columns.Add(dc);

             dc = new DataColumn("KB", Type.GetType("System.String"));

             dt.Columns.Add(dc);

             Page.Session["Files"] = dt;

        }

        #endregion

        #region AddRow for file upload

        private void AddRow(string file, string path, double length)

        {

             dt = (DataTable)Page.Session["Files"];

             if (dt == null)

            {

                 AddMoreColumns();

            }

            dr = dt.NewRow();

            dr["FileName"] = file;

            dr["FilePath"] = path;          

            dr["FileSize"] = Convert.ToString(length);

            dr["KB"] = "KB";         

            dt.Rows.Add(dr);

            Page.Session["Files"] = dt;

            this.dgdUpload.DataSource = dt;

            this.dgdUpload.DataBind();//bind in grid

       }

       #endregion

   }
}

Deploy File Upload Web part in the share point server