C# function to get the Content Type GUID from a Sharepoint list using web services

Simple helper function to get the GUID of a list from Sharepoint web services.

Note that in the code below I have a class level object pointing to the Lists.asmx web service called m_listService already established , but I have left in the code to establish this connection in the comments as an example.

string GetListContentTypeGuid(string listName, string listID, string contentTypeName)
        {
            string defaultGuid = "";
            
            try
            {
                
                //ListsService.Lists listService = new ListsService.Lists();
                //listService.Credentials = System.Net.CredentialCache.DefaultCredentials;

                //XmlNode ndList = listService.GetList(fileInfo.m_listInfo.m_listName);
                //XmlNode ndVersion = ndList.Attributes["Version"];

                XmlNode contentTypes = m_listService.GetListContentTypes(listID, "anything");

                // Loop through the fields
                foreach (XmlNode node in contentTypes)
                {
                    System.Diagnostics.Debug.Print(node.Attributes["Name"].Value.ToString());
                    if (node.Attributes["Name"].Value.ToString() == contentTypeName)
                    {
                        defaultGuid = node.Attributes["ID"].Value.ToString();
                        break;
                    }
                }
                
            }
            catch (Exception ex)
            {

                throw new Exception("ERROR: Reading content types from target site.\r\n"
                    + ex.Message + "\r\nDetails: " + ex.InnerException + "\r\n" +
                    "Check the settings file to ensure that the list settings match the target site.", ex);

            }
            return defaultGuid;
        }

Mark ContentType as default in Sharepoint Designer 2010

This is pretty simple stuff, but I just spent ten minutes looking at Sharepoint Designer trying to figure out where I clicked to change the default content type on a list!  I guess I'm just not used to the ribbon :)

Google didn't help (probably too easy a problem for it) so I thought I would right this up in case anyone else was suffering.

I've created a content type, here it is associated with a list in Sharepoint Designer:

But how do I make it default?  I finally spotted the option after clicking through endless options in SP designer - the trick is to highlight the content type (and not click on its name to see the content type editor!) and the look at the ribbon:

Hurray!  There it is.
Click on this and we have a new default:

I hope this helps some other Sharepoint 2010 newbie.