Help me out, I am unable to set the errortext in error Provider.

Hi, In my application, I am using the ErrorProvider component, I am doing the validation for the textbox, whenever enterd value are not in format i am setting the error as shown below nameErrorProvider.SetError(this.nameTextBox1, "Not in Format."); But i am unable to see the text "Not in Format.", just i can see the error icon .. plz help me out. Regards soman.