rdlc barcode PART IV in C#

Generator Universal Product Code version A in C# PART IV

PART IV
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Figure 19-1
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Example of a RichTextBox control
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that will set a selected area of text to bold The code to implement this in the Button Click event is as follows:
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private void btnSetBold_Click(object sender, SystemEventArgs e) { Font oldFont; Font myFont; oldFont = thisrtfTest1SelectionFont; myFont = new Font (oldFont, FontStyleBold); thisrtfTest1SelectionFont = myFont; thisrtfTest1Focus(); }
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When the button is clicked, whatever text is selected is converted to bold In our example, we selected the word bolding and then clicked the button As you can see, the text changes to bold font for just the word bolding Obviously, this is a trivial example of what you can do to effect formatting changes to the text in a RichTextBox The code demonstrates the SelectionFont property, which is just one of the selection properties available for use
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19: User-Interface Components
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Labels
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This is probably one of the most used controls in the Windows application environment Using a label allows you to provide information to the user There are two types of label controls that can be added to a Windows form: Label is the standard label, and LinkLabel allows you to create a hyperlink label We have modified our form and added a label (see the next illustration) encouraging students to click on the hyperlink to reach Microsoft s web site
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PART IV
EXAM TIP Notice that the Caption property is not the property to use to set the text of the label You use the Text property in Visual Studio NET We will not spend much time discussing the label controls since they are very basic controls; however, it warrants looking at how you set the properties to support hyperlinks for the LinkLabel control In the InitializeComponent() method, the Designer has added the following code:
thislinkLabel1LinkArea = new SystemWindowsFormsLinkArea(0,20); thislinkLabel1Location = new SystemDrawingPoint (240, 344); thislinkLabel1Name = "linkLabel1"; thislinkLabel1Text = "Microsoft\'s Web Site"; thislinkLabel1LinkClicked += new SystemWindowsFormsLinkLabelLinkClickedEventHandler (thislinkLabel1_LinkClicked);
In the linkLabel1_LinkClicked event, we add the following code:
private void linkLabel1_LinkClicked (object sender, SystemWindowsFormsLinkLabelLinkClickedEventArgs e) { // find out which link was clicked linkLabel1Links[linkLabel1LinksIndexOf (eLink)]Visited = true; SystemDiagnosticsProcessStart ("http://wwwmicrosoftcom"); }
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Now when you click on the hyperlink in the LinkLabel control, you will be taken to a new instance of Microsoft Internet Explorer, and the web site for Microsoft will open
List Boxes, Combo Boxes, Checked List Boxes, and Such
In order to provide users with a list of options from which to choose, we utilize the ListBox and its various adaptations ComboBox and CheckedListBox Look at Figure 19-2 to see the difference between the three of them The ListBox allows a list of data to be presented to the user with a scrollbar on the right side for scrolling through the list The ComboBox presents a drop-down list of data to the user Notice that in our example the data is sorted this is accomplished by setting the Sorted property to True Other properties that can be set on the ComboBox include the following: MaxDropDownItems controls the number of items shown in the drop-down list DropDownStyle can be set to Simple, DropDown, or DropDownList (see Figure 19-3)
Figure 19-2
Using ListBox, ComboBox, and CheckedListBox controls
19: User-Interface Components
PART IV
Figure 19-3
Using the DropDownStyle settings for a ComboBox control
You can see from Figure 19-3 that the Simple style presents one item in the box, while both the DropDownList and DropDown styles allow you to drop down a predefined number of items The difference between DropDownList and DropDown has to do with the data itself DropDown style allows the user to type in the top line of the drop-down list and DropDownList only lets the user select items that have been displayed Here are some important properties of the ListBox: MultiColumn Permits multiple columns of data to be displayed
SelectionMode Allows you to set the maximum number of items that can be selected at a time SelectedIndex Specifies the first selected item by item (or index) number (if no item is selected, this value is 1) Items Contains the data that is displayed in the list Items is a collection The Count property will return the number of items in the list The Add property will add items to the list at run time, and the Remove property will
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