Selecting Check Boxes from Within Your Application in .NET

Generating QR Code 2d barcode in .NET Selecting Check Boxes from Within Your Application

Selecting Check Boxes from Within Your Application
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You can select or unselect a check box from within your application by changing the value of the Checked property Here's what you do to check the check box:
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1DChecked = True
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Drop-Down Lists, Radio Buttons, Check Boxes
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Figure 8-7 The application detects which check boxes are checked
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Here's how to uncheck the check box:
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1DChecked
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False
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Remember to replace the ID in the previous examples with the ID for the check box
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Looking Ahead
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Designing your web page using drop-down lists, radio buttons, and check boxes is one of the most efficient ways to gather information from the visitor to your web site Visitors can make their choices quickly with a few clicks of the mouse and not worry about typing information using the keyboard
ASPNET 20 Demystified
A drop-down list box contains two or more items that are hidden from sight (unless one has been selected) until the visitor selects the down arrow that is adjacent to the drop-down list box The visitor then selects an item from the list once the list is displayed Your application retrieves the selected item by examining the Value property of the drop-down list box and comparing it to the Text of each item on the list A radio button is grouped together with other related radio buttons in a RadioButtonList Each radio button presents the visitor with a choice Only one can be selected Other radio buttons in the group are automatically unselected when one radio button within the group is chosen Your application detects which radio button was selected by examining the Value property of the RadioButtonList This is the same technique used to detect an item selected from a drop-down list box A check box is also used to present an option to the visitor However, the status of a check box doesn't affect the statuses of other check boxes, if any, on the web page Your application determines if the visitor checked a check box by examining the check box's Checked property If the property is True, then the visitor selected the check box; otherwise, the check box wasn't selected You can check or uncheck a check box from within your application by setting the Checked property in your code
Quiz
1 You can set a default selection for a drop-down list box a True
b False
2 The best control to use when there is one of many options from which to select is a A drop-down list box b A radio button c A check box d None of the above 3 What is assigned to the Value property of an item in a drop-down list box if you don't assign anything to the Value property a Nothing is assigned to the Value property b The value of the ID property c The value of the Text property
d You must assign a value to the Value property
Drop-Down Lists, Radio Buttons, Check Boxes
4 Unless you use the UP m o w and o o m ARROW keys to change the order, in what order do items appear in a drop-down list box a The order in which they are entered b Alphabetical order c Numerical order d Random order 5 An If ElseIf statement might be used to evaluate a check box because a All check boxes within a group must be examined b All check boxes must be examined, including those outside the group c If one check box is true, you don't need to examine other radio buttons within the group
d None of the above
6 What happens when the Boolean value of an item is set to true in a dropdown list box a The item is selected by default if the visitor doesn't select an item from the list b The item isn't displayed c The name of the item is set to true d The name of the item is set to false
7 The selection of a check box affects the statuses of other check boxes
a True b False
8 Selecting a radio button affects the selection of every check box
a True b False
9 You must set the Value property of an item on the drop-down list box a True b False 10 The Value property of a check box is used to identify the check box within your code a True
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