What are the methods of data binding for DropDownList drop-down box list controls in ASP.NET

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The DropDownList Web server control enables the user to select an item from a predefined list. It differs from the ListBox Web server control in that its item list is hidden until the user clicks the drop-down button. In addition, the DropDownList control differs from the ListBox control in that it does not support multiple selection mode.

The rendering of DropDownList in html corresponds to select, so let's take a look at several ways in which DropDownList binds data.

First, bind the Array array to DropDownList

String [] Month = new string [7] {"January", "February", "March", "April", "May", "June", "July"}; this.DropDownList1.DataSource = Month;this.DropDownList1.DataBind ()

This method can bind only one set of data to DropDownList, because DropDownList can bind two kinds of data: 1 is DataTextField and 2 is DataValueField, so the value of DataTextField after the first method is bound = = DataTextField value.

Bind the dynamic Array array to DropDownList

ArrayList ar = new ArrayList (); for (int I = 1; I