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Windows Forms provide two widgets that function as spin controls (also known as up/down controls). Like the ComboBox and ListBox types, these new items also allow the user to choose an item from a range of possible selections. The difference is that when you re using a DomainUpDown or NumericUpDown control, the information is selected using a pair of small up and down arrows. For example, check out Figure 21-20.

Given your work with similar types, you should find working with the UpDown widgets painless. The DomainUpDown widget allows the user to select from a set of string data. NumericUpDown allows selections from a range of numeric data points. Each widget derives from a common direct base class, UpDownBase. Table 21-7 describes some important properties of this class.

Note In Internet Explorer 6 and lower, border-color is not implemented for row groups (indicated by

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Gets or sets a value indicating whether the user can use the up arrow and down arrow keys to select values Gets or sets a value indicating whether the text can only be changed by the use of the up and down arrows and not by typing in the control to locate a given string Gets or sets the current text displayed in the spin control Gets or sets the alignment of the text in the spin control Gets or sets the alignment of the up and down arrows on the spin control, using the LeftRightAlignment enumeration

The DomainUpDown control adds a small set of properties (see Table 21-8) that allow you to configure and manipulate the textual data in the widget. Table 21-8. DomainUpDown Properties

The first thing we re doing is checking to make sure our worksheet object still exists. If m_xlWksht Is Nothing Then 'double check that we still have a valid object blnReturn = False GoTo Exit_Function End If If it doesn t, we return a False value and exit the function. Next we get our empty row location from our cExcelUtils object: lngNewRowNum = m_oXL.FindEmptyRow(m_xlWksht) Then we use the m_xlWksht variable that contains the database worksheet and populate each column in the row with data from our class properties: With m_xlWksht .Cells(lngNewRowNum, .Cells(lngNewRowNum, .Cells(lngNewRowNum, .Cells(lngNewRowNum, .Cells(lngNewRowNum, .Cells(lngNewRowNum, End With

Allows you to gain access to the set of items stored in the widget Returns the zero-based index of the currently selected item (a value of 1 indicates no selection) Returns the selected item itself (not its index) Configures whether or not the strings should be alphabetized Controls if the collection of items continues to the first or last item if the user continues past the end of the list

Sets the numerical value to increment the value in the control when the up or down arrow is clicked. The default is to advance the value by 1. Sets the upper and lower limits of the value in the control. Returns the current value in the control.

the thead, tbody, and tfoot elements) and the transparent value is not supported (the initial value is displayed instead).

Here is a partial InitializeComponent() that configures this page s NumericUpDown and DomainUpDown widgets: private void InitializeComponent() { ... // // numericUpDown //

... this.numericUpDown.Maximum = new decimal(new int[] { 5000, 0, 0, 0}); this.numericUpDown.Name = "numericUpDown"; this.numericUpDown.ThousandsSeparator = true; // // domainUpDown // this.domainUpDown.Items.Add("Another Selection"); this.domainUpDown.Items.Add("Final Selection"); this.domainUpDown.Items.Add("Selection One"); this.domainUpDown.Items.Add("Third Selection"); this.domainUpDown.Name = "domainUpDown"; this.domainUpDown.Sorted = true; ... } The Click event handler for this page s Button type simply asks each type for its current value and places it in the appropriate Label (lblCurrSel) as a formatted string, as shown here: private void btnGetSelections_Click (object sender, EventArgs e) { // Get info from updowns... lblCurrSel.Text = string.Format("String: {0}\nNumber: {1}", domainUpDown.Text, numericUpDown.Value); }

Most Windows Forms applications will need to validate user input in one way or another. This is especially true with dialog boxes, as you should inform users if they make a processing error before continuing forward. The ErrorProvider type can be used to provide a visual cue of user input error. For example, assume you have a Form containing a TextBox and Button widget. If the user enters more than five characters in the TextBox and the TextBox loses focus, the error information shown in Figure 21-21 could be displayed.

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