Folder Creation in SharePoint 2010 Document Library

I have used the following code for folder creation only in document library via list item creation workflow

SPListItem CurItem = workflowProperties.Item;

SPSite MySite = new SPSite(workflowProperties.WebUrl);

SPWeb Myweb = MySite.OpenWeb();

SPDocumentLibrary spdoclibrary = (SPDocumentLibrary)Myweb.Lists["My Documents"];

Myweb.Folders.Add(workflowProperties.WebUrl + "/My%20Documents/" + CurItem["Title"].ToString());

spdoclibrary.Update();  

Another Way:-

SPList splstDoc = Myweb.Lists["My Documents"];

SPFolderCollection folderColl = splstDoc.RootFolder.SubFolders;

SPFolder newFolder = folderColl.Add(workflowProperties.WebUrl + "/My%20Documents/" + CurItem["Title"].ToString());        

I have used the following code for file along with properties creation in document library via list item creation workflow

Hashtable objhash = new Hashtable();

byte[] byt = new byte[Convert.ToInt32(FileUpload1.PostedFile.ContentLength)];

objhash.Add("custom field name", "value");

SPFolder myfolder = Myweb.GetList(workflowProperties.WebUrl + "/My%20Documents/").RootFolder;

myfolder.Files.Add("Test.txt", byt, objhash, false);           

myfolder.Update();

I have used the following code for folder along with properties creation in document library via list item creation workflow

SPFolder myfolder = Myweb.GetFolder(workflowProperties.WebUrl + "/My%20Documents/");

SPFolder spfolder = myfolder.SubFolders.Add(workflowProperties.WebUrl + "/My%20Documents/" + CurItem["Title"].ToString());

spfolder.Item["Title"] = "Aasai";

spfolder.Item["Test"] = "Aasai";

spfolder.Item.SystemUpdate(false);