Why would you have multiple databindings to a WinForms control?

Question

I'm trying to learn how to use WinForms databinding, but one thing that's confusing me is why you would "Add" a databinding rather then "Set" a databinding? For example consider the following code.

TextBox1.DataBindings.Add("Text", ds,"Customers.CustomerID")

As I understand it this line adds a databinding to TextBox1 that binds its Text property to the CustomerID fields in the Customers table of the ds DataSet .

Yet to me the term "Add" implies that you can add multiple of something. Which confuses me in this example. Why would you have a textbox bound to multiple things? How could that even be possible? Can someone provide an example where multiple bindings make sense?

Answer 1

您还可以绑定其他字段，例如“已启用”。

TextBox1.DataBindings.Add("Enabled", myPresentationModel, "IsTextBox1Enabled");