c# - How to get the TFS workitem validation error message by code? -

i know workitem.validate method can arraylist of fields in work item not valid(msdn).

but seem contain invalid fields , names, not contain error messages, i.e. why they're invalid, useful situation of submitting workitem without using built in tfs controls.
how error tip "new bug 1: tf200012: field 'title' cannot empty."?

for better understanding, please see picture.
using vs2010 sp1 chinese language, , error discription translated above.

visual studio client wraps tfs error messages. can't capture tf* errors can fieldstatus , print own message.

var invalidfields = workitem.validate(); if (invalidfields.count > 0) {     foreach (field field in invalidfields)     {         string errormessage = string.empty;         if (field.status == fieldstatus.invalidempty)         {             errormessage = string.format("{0} {1} {2}: tf20012: field \"{3}\" cannot empty."                 , field.workitem.state                 , field.workitem.type.name                 , field.workitem.temporaryid                 , field.name);         }         //... more handling here          console.writeline(errormessage);     } } else // validation passed {     workitem.save(); }