c# - Assert.AreEqual failed. Expected: <(Null)> -

i'm working on coded ui test. when run test:

 public partial class uimap {     public uimap()     {         this.testinit();      }       private handlingunitdatacontroller hudc = new handlingunitdatacontroller();     public datatransferhandlingunit testhu = new datatransferhandlingunit();              public void pressenter3()  {                list<datatransferhandlingunit> datalist;                                 datalist = hudc.gethandlingunits(null);         foreach (datatransferhandlingunit hu in datalist)         {              if (hu.idlabel == this.idlabelinputparams.uiscannboxedit2text)             {                  testhu = hu;                 break;             }          }                     assert.areequal(testhu.idlabel,this.idlabelinputparams.uiscannboxedit2text);            } 

occurs error:

assert.areequal failed expected:<(null)>

what do wrong? thanks.

my guess

if (hu.idlabel == this.idlabelinputparams.uiscannboxedit2text) 

does not evaluate true therefore

public datatransferhandlingunit testhu = new datatransferhandlingunit();   

is still in testhu reference , testhu.idlabel null