Propagating events from one Form to another Form in C#

Question

How can I click a Button in one form and update text in a TextBox in another form?

Answer 1

Assuming WinForms;

If the textbox is bound to a property of an object, you would implement the INotifyPropertyChanged interface on the object, and notify about the value of the string being changed.

public class MyClass : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private string title;
    public string Title {
      get { return title; } 
      set { 
        if(value != title)
        {
          this.title = value;
          if (this.PropertyChanged != null)
          {
             this.PropertyChanged(this, new PropertyChangedEventArgs("Title"));
          }
       }
  }

With the above, if you bind to the Title property - the update will go through 'automatically' to all forms/textboxes that bind to the object. I would recommend this above sending specific events, as this is the common way of notifying binding of updates to object properties.