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in a string format The Label control merely displays the text The LinkLabel control displays the text as if it were an HTML link, firing an event when the link is clicked The StatusBar control displays the text in the same way a Label does (but, by default, docked to the bottom of the container), but it also allows for multiple chunks of text separated into panels In addition to displaying text, the TextBox control allows the user to edit the text in single or multiline mode (depending on the value of Multiline property) The RichTextBox control allows for editing like TextBox but also supports RTF (Rich Text Format) data, which includes font and color information as well as graphics When the Text value of either of these controls changes, the TextChanged event is fired All the numeric value controls expose a numeric Value property, whose value can range from the Minimum to the Maximum property The difference is only a matter of which UI you'd like to show to the user When the Value properties change, the ValueChanged property is fired The Boolean value controls CheckBox and RadioButton expose a Checked property that reflects whether or not they're checked Both Boolean value controls can also be set to a third, "indeterminate" state, which is one of the three possible values exposed from the CheckState property When the CheckState is changed, the CheckedChanged and CheckStateChanged events are fired The date value controls allow the user to pick one or more instances of the DateTime type MonthCalendar allows the choice of beginning and ending dates as exposed by the SelectionRange property (signaled by the SelectionRangeChanged event) DateTimePicker allows the user to enter a single date and time as exposed by the Value property (signaled by the ValueChanged event) The graphical value controls show images, although neither allows the images to be changed The PictureBox control shows any image as set by the Image property PrintPreviewControl shows, one page at a time, a preview of print data generated from a PrintDocument object (as described in 7: Printing).

FIGURE 6-8 Overview screen of Network and Sharing Center 3 A list of network connections appears Right-click the connection you want to inspect and select Properties 4 Select Internet Protocol Version 4 (TCP/IPv4) and click Properties (see Figure 6-9)

FIGURE 6-9 The various services associated with the network connection Notice you have IP version 4 and 6, but for now you care only about version 4

Internet Protocol (IP)

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If one value at a time is good, then several values at a time must be better The list controls ComboBox, CheckedListBox, ListBox, DomainUpDown, ListView, DataGrid, and TreeView can show more than one value at a time Most of the list controls ComboBox, CheckedListBox, ListBox, and DomainUpDown show a list of objects exposed by the Items collection To add a new item you use this collection: void Form1_Load(object sender, EventArgs e) { listBox1ItemsAdd("an item"); } This sample adds a string object to the list of items, but you can add any object: void Form1_Load(object sender, EventArgs e) { DateTime bday = DateTimeParse("1995-08-30 6:02pm"); listBox1ItemsAdd(bday); } To come up with a string to display, the list controls that take objects as items call the ToString method To show your own custom items in a list control, you simply implement the ToString method: class Person {

5 The basic properties for the connection appear, which you can change as required (see Figure 6-10)

FIGURE 6-10 Basic TCP/IPv4 con guration screen In Figure 6-10, you had the option to automatically assign IP addresses, which is covered in detail in 7 For now stick with statically de ning the IP address You can also see your IP information using the ifcongif command with no parameters (Add the /all parameter for more information, including DNS and WINS, which are covered in 7)

100times do |i| url_queuepush "http://localhost:3000/api/v1/entries/#{i}" end responses = [] while responsessize < 99 responses << @responsespop end # do something with the responses

Ethernet adapter Local Area Connection: Connection-speci c DNS Suf x Link-local IPv6 Address IPv4 Address Subnet Mask Default Gateway : : : : :

fe80::40b:144b:956:f7de%7 1921681190 2552552550 19216811

string name; int age; public Person(string name, int age) { thisname = name; thisage = age; } public string Name { get { return name; } set { name = value; } } public int Age { get { return age; } set { age = value; } } public override string ToString() { return stringFormat("{0} is {1} years old", Name, Age); } } void Form1_Load(object sender, EventArgs e) { Person[] boys = { new Person("Tom", 7), new Person("John", 8) }; foreach( Person boy in boys ) { listBox1ItemsAdd(boy); } } Figure 81 shows the instances of the custom type shown in a ListBox control

6

This ifcongif shows the IP address, subnet mask, and the default gateway The computer uses this gateway information in the same way a router works Each machine has a routing table of where to send packets, depending on the destination To see the routing table, run the route print command:

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