How to send variable to widget from c++?

[amazingDeveloper]

From code I want to assecc widget and and send string variable to it. But with my code I see only default value for it. Whet I set value in widget without code - it works.

Call method from another class:

  UChangeDialogBottomText* changeDialogBottomText = CreateWidget<UChangeDialogBottomText>(
    GetWorld()->GetFirstPlayerController(), UChangeDialogBottomText::StaticClass());
  if (changeDialogBottomText)
  {
    changeDialogBottomText->UpdateDialogBotton();
  }

.h

UCLASS()
class HOME_API UChangeDialogBottomText : public UUserWidget
{
  GENERATED_BODY()
  
public:
  UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (BindWidget)) FString st_Name_Key;

  UFUNCTION()
  void UpdateDialogBotton();
};

.cpp

void UChangeDialogBottomText::UpdateDialogBotton()
{
  st_Name_Key = "core";
}