public virtual int sp_renamediagram(string diagramname, Nullable<int> owner_id, string new_diagramname)
{
var diagramnameParameter = diagramname != null ?
new ObjectParameter("diagramname", diagramname) :
new ObjectParameter("diagramname", typeof(string));
var owner_idParameter = owner_id.HasValue ?
new ObjectParameter("owner_id", owner_id) :
new ObjectParameter("owner_id", typeof(int));
var new_diagramnameParameter = new_diagramname != null ?
new ObjectParameter("new_diagramname", new_diagramname) :
new ObjectParameter("new_diagramname", typeof(string));
return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction("sp_renamediagram", diagramnameParameter, owner_idParameter, new_diagramnameParameter);
}