Data binding for TextBox

Question

I have a basic property that stores an object of type Fruit   Fruit food  public Fruit Food       get  return this food       set               this food  value          this RefreshDataBindings             public void RefreshDataBindings         this textBox DataBindings Clear        this textBox DataBindings Add  Text   this Food   Name        So I set this Food outside the form and then it shows up in the UI   If I modify this Food  it updates correctly  If I modify the UI programmatically like   this textBox Text    NewFruit   it doesn t update this Food   Why could this be  I also implemented INotifyPropertyChanged for Fruit Name  but still the same

User · Answer

You can t databind to a property and then explictly assign a value to the databound property

User · Answer

I Recommend you implement INotifyPropertyChanged and change your databinding code to this   this textBox DataBindings Add  Text                                   this Food                                   Name                                   false                                  DataSourceUpdateMode OnPropertyChanged     That ll fix it   Note that the default DataSourceUpdateMode is OnValidation  so if you don t specify OnPropertyChanged  the model object won t be updated until after your validations have occurred

User · Answer

You need a bindingsource object to act as an intermediary and assist in the binding  Then instead of updating the user interface  update the underlining model   var model    Fruit  bindingSource1 DataSource   model FruitType    oranges    bindingSource ResetBindings      Read up on BindingSource and simple data binding for Windows Forms

User · Answer

We can use following code  textBox1 DataBindings Add  Text   model   Name   false  DataSourceUpdateMode OnPropertyChanged     Where     Text      the property of textbox    model      the model object enter code here     Name      the value of model which to bind the textbox

[c#] Data binding for TextBox

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