Set Custom Attributes

IWFWorkflowService svc = GetWorkflowService();
string customID = ..// for example, "InfoPath:011eaf6c46ac4723b25b4db5772d9912"

NameValue[] attributes = new NameValue[] 
    {
    new NameValue("CustomAttributeName1","CustomAttributevalue1"),
    new NameValue("CustomAttributeName2",false),
    new NameValue("CustomAttributeName3", 10.0)
	};

try
	{
    svc.SetCustomAttrs(customID, attributes);
	}

catch (Exception ex)
	{
    Console.WriteLine("Failed! " + ShUtil.GetSoapMessage(ex));
	}