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A list control is really nothing more than a control that displays a list of items in the client browser. Many of the list controls provided by ASP.NET allow for user input, but that is not a requirement for it to be a list control. ASP.NET provides seven list controls to choose from: DataGrid displays the fields of a data source as columns in a table. Each row represents a record in the data source. The DataGrid not only supports the display of a list of items, but it also allows for selecting, editing, deleting, paging, and sorting. DataList displays a data-bound list using a template. The DataList supports displaying, selecting, and editing of its items. DropDownList displays a single, select drop-down list control of ListItem objects. You can create the DropDownList using a data-bound list as well. CheckBoxList displays a multiselect check box grouped list of ListItem objects. You can dynamically create the CheckBoxList using a data-bound list. This control provides the same functionality as that of the standard CheckBox control, with the added benefit of data binding, but at the expense of fewer formatting choices. ListBox displays a single or multiselect list box control of ListItem objects. You can create the ListBox using a data-bound list as well. RadioButtonList displays a single, select radio button grouped list of ListItem objects. You can dynamically create the RadioButtonList using a data-bound list. This control provides the same functionality as that of the standard RadioButton control, with the added benefit of data binding, but at the expense of fewer formatting choices. Repeater displays a data bound list. The Repeater does not support format templating, selecting, or editing of its items.

It was shown repeatedly in the preceding list that list controls display bound data. Basically, bound data are collections that support the IEnumerable, ICollection, or IListSource interface. In other words, you can display the collections discussed in 7 and the DataView, DataSet, and DataReader objects discussed in 13 using list controls. Two members that all list controls have in common are the DataSource property and the DataBind() method. Dynamically creating a list requires you to use both members together. The DataSource property associates a bound data source with the list control. The DataBind() method then binds the data source to the control. A common mistake is to forget to call DataBind(). You will know when you have done this because you will get no data displayed in the list control for which you have set the DataSource property. To determine which item was selected, you will probably use the SelectedItem property. You can use the SelectedIndex property in conjunction with the Items property, but as you can see here, using SelectedItem is much easier: String *val1 = listBox->SelectedItem->Value; String *val2 = listBox->Items[listBox->SelectedIndex]->Value; To set an item in a list control as selected, you use the SelectedIndex property: listBox->SelectedIndex = 3; // remember items start at an index of 0

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The numbers themselves may be somewhat confusing, because they indicate how many lines of code were covered but not which lines of code were covered. But the VSTS testing tools allow you to put it in perspective by graphically showing the code coverage directly over the code, as shown in Figure 12-14. To see this display, in the Code Coverage Results window, double-click the ValidateUser method line or right-click the ValidateUser result and select Go to Source Code.

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