Setting the default value to taxonomy column in sharepoint 2010 using client object model

Question

I am creating a metadata column and I want to set its default value in sharepoint 2010 using client object model. Can anyone help me?
My code for creating metadata column is as below:
            ClientContext clientContext = new ClientContext(siteUrl);
            Web site = clientContext.Web;
            List list = site.Lists.GetByTitle("LibraryName");
            FieldCollection collField = list.Fields;
            string fieldSchema = "<Field Type='TaxonomyFieldType' DisplayName='SoftwareColumn' Name='SoftwareColumn' />";
            collField.AddFieldAsXml(fieldSchema, true, AddFieldOptions.DefaultValue);
            //oneField.DefaultValue = "ASP.NET|4c984b91-b308-4884-b1f1-aee5d7ed58b2"; // wssId[0].ToString() + ";#" + term.Name + "|" + term.Id.ToString().ToLower();
            clientContext.Load(collField);           
            clientContext.ExecuteQuery();

Answer 1

Hi,
Please try the code like this:
ClientContext clientContext = new ClientContext("http://yoursite/");
List list = clientContext.Web.Lists.GetByTitle("List1_mmsfield");
clientContext.Load(list);
clientContext.ExecuteQuery();
FieldCollection fields = list.Fields;
clientContext.Load(fields);
clientContext.ExecuteQuery();
Field f = fields.GetByTitle("mms");
clientContext.Load(f);
clientContext.ExecuteQuery();
Console.WriteLine(f.Title + "---" + f.DefaultValue);
//2;#A2|a0a95267-b758-4e4d-8c39-067069fd2eef
//1;#A1|641f5726-992c-41c8-9ddc-204a60b88584
f.DefaultValue = "1;#A1|641f5726-992c-41c8-9ddc-204a60b88584";
f.Update();
clientContext.Load(f);
clientContext.ExecuteQuery();
Console.WriteLine(f.Title + "---" + f.DefaultValue);
Best regards
Patrick Liang
TechNet Community Support