How to move SharePoint list items to a folder and subfolders in the same list using C# programmatically?

It was really simple at the end, but it took my whole day for writing the utility to achieve the desired results.

However, the tricky part of the utility was how i can move the items to a sub folder of the list.

For example there is a folder 2014 and it contains 12 folders of each month. You want to move the item inside a folder.

Keep in mind the hierarchy of SharePoint. Follow below steps.

1. Get SPWeb

2. Get SPList

3. Get List Folders

4. Get Sub Folders of Folders

5. Copy the Item

I have divided the steps into Methods. Code below.

Get Site,Web and list Objects and Passing them to a method InsertItemIntoFolder.

using (SPSite site = new SPSite("Your Site URL"))

{

    using (SPWeb web = site.OpenWeb())

    {

        SPList sourceList = web.Lists.TryGetList("Your List Name");

        List<Guid> IID = new List<Guid>();

        foreach (SPListItem item in sourceList.Items)

        {

        InsertItemIntoFolder(sourceList, item, "2014", "July");

        IID.Add(item.UniqueId);

        }

    }

}

Now inserting item in the folders. 

Note: Make sure your folders have been already created in the desired structure.

public static void InsertItemIntoFolder(SPList sourceList, SPListItem item, string year, string month)

        {

            foreach (SPFolder folder in sourceList.RootFolder.SubFolders)

            {

                if (folder.Name == year)

                {

                    foreach (SPFolder SubFolder in folder.SubFolders)

                    {

                        if (SubFolder.Name == month)

                        {

                            try

                            {

                                SPListItem listItem = sourceList.Items.Add(SubFolder.ServerRelativeUrl, SPFileSystemObjectType.File);

                                listItem["Title"] = item["Title"];

                                listItem["Author"] = item["Author"];

                                listItem["Modified"] = item["Modified"];

                                listItem["Editor"] = item["Editor"];

                                listItem.Update();

                            }

                            catch(Exception)

                            { }

                        }

                    }

                }

            }

        }

 Your item will be copied successfully. Now you can delete the original item.

                for (int i = 0; i < IID.Count; i++)

                        {

                            SPListItem item = sourceList.GetItemByUniqueId(IID[i]);

                            item.Delete();

                        }

                        sourceList.Update();

Any questions, please put in comments. 

Regards,