单项选择题 You are developing a Windows Presentation Foundation (WPF) application that display pricing and inventory. List boxs ItemsSource property has decimal and string types. Decimals represent price and strings represents the folowing markup is defined as follows. You need to ensure that data templates are used to format the strings without changes and the decimals as .. Which markup segment should you insert at line 05 ?（）

单项选择题 You are developing a Windows Forms application that contains a DataGridView control. The DataGridView capture the customers name, address, and phone number. You have been asked to provide data validation in a DataGridView to prevent users from leaving the.. You need to ensure that users cannot tab out of the name field without entering data What should you do ?（）

单项选择题 The UI is not being updated when the Data property is set. You need to ensure that the DisplayData class correctly updates the UI when the Data .. What should you do ?（）