Sharepoint WS - Lists - Check if folder exists and create folders

Here's the code to check if the folder exists using Sharepoint Web Service
EDMSRPath is the full path of the file (eg. http://url/ListName/blabla/be/bo/x.pdf)
WSPath is the url of the document library (eg. http://url)

 char[] separator = ("/").ToCharArray();  
       string[] folder = EDMSRPath.Substring(EDMSRPath.IndexOf("ListName") + ("ListName").Length + 1).Split(separator);  
 //check first folder  
       // This method is separated to avoid getting the subfolders for all top folders, as it will have too much recurrence.  
       getFolders(string.Empty, ref dt);  
       string firstFolder = WSPath + "/ListName";  
       if (!checkFolderExist(dt, firstFolder + "/" + folder[0]))  
       {  
         CreateFolder(firstFolder, folder[0]);  
       }  
       firstFolder += "/" + folder[0];  
       //check the subfolders required  
       dt = new DataTable();  
       if (folder.Length > 1)  
       {  
         getFolders(folder[0], ref dt, true);  
         string subfolder = firstFolder;  
         for (int i = 1; i < folder.Length; i++)  
         {  
           if (!checkFolderExist(dt, subfolder + "/" + folder[i]))  
           {  
             CreateFolder(subfolder, folder[i]);  
           }  
           subfolder += "/" + folder[i];  
         }  
       }  

Now the actual functions
CheckFolderExist - to check if the folder exists

     private static bool checkFolderExist(DataTable dt, string folderpath)  
     {  
       if (dt.Rows.Count > 0)  
       {  
         for (int i = 0; i < dt.Rows.Count; i++)  
         {  
           if (dt.Rows[i][0].ToString() == folderpath || dt.Rows[i][0].ToString() == folderpath.Replace(" ","%20"))  
           {  
             return true;  
           }  
         }  
       }  
       return false;  
     }  

And function to create the folder

     private static string CreateFolder(string path, string foldername)  
     {  
       string res = string.Empty;  
       try  
       {  
         using (ListWS.Lists listService = new ListWS.Lists())  
         {  
           listService.Url = ListURL;  
           listService.Credentials = System.Net.CredentialCache.DefaultCredentials;  
           listService.Credentials = new System.Net.NetworkCredential(username, password);  
           XmlDocument doc = new XmlDocument();  
           string xmlCommand = "<Batch OnError='Continue' RootFolder='" + path +  
               "'><Method ID='1' Cmd='New'><Field Name='ID'>New</Field><Field Name='FSObjType'>1</Field><Field Name='BaseName'>" +  
               foldername + "</Field></Method></Batch>";  
           doc.LoadXml(xmlCommand);  
           XmlNode batchNode = doc.SelectSingleNode("//Batch");  
           XmlNode node1 = listService.UpdateListItems("ListName", batchNode);  
           if ((node1 != null) && (node1.FirstChild.FirstChild.InnerText == FOLDER_EXISTS) || (node1.FirstChild.FirstChild.InnerText == SUCCESS))  
           {  
             // success  
             res = "";  
           }  
           else  
           {  
             res = "Create new folder failed for: " + foldername + ". Error Details: " + node1.InnerText;  
           }  
             
         }  
       }  
       catch (Exception ex)  
       {  
         if (ex.Message != "Column name 'ID' is defined for different mapping types.")  
           throw ex;  
       }  
       return res;  
     }