Using Entity Framework Code First and model binding in a RadGrid, in insert row there is a default value for all non-string types that are not nullable. For example "0" for Int or Decimal, "01/01/0001" for Date, etc... So we have to make code to clear these values in textboxs or make SQL requests to give a default value to RadComboBoxs linked to a Foreign Key. This does not happens using a FormView and model binding. This does not happens using a RadGrid and EntityDataSource . Please make an option to let all controls blank in insert mode without doing code !