how to use barcode scanner in asp.net c# Starting a New Custom Form in Microsoft Office

Creating PDF417 in Microsoft Office Starting a New Custom Form

Starting a New Custom Form
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When you start a new custom form without the help of the Form Wizard or one of the AutoForm templates, you begin with an empty Design view window If you chose a table or query in the New Form dialog box to use as the basis for the form, you can display the field list and drag the fields into the form design If you haven t already chosen the basis for the form, you can define it in Design view by selecting the table or query from the form s Record Source property list No law says you have to base a form on data You can create a form that displays courses of action from which to choose or one that simply displays a welcoming screen, which times out after a few seconds The first sections of this chapter dwell on forms that contain data, while later sections discuss special-purpose forms
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Placing and Customizing Data-Related Controls
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In the last chapter, you saw how to add bound text-box controls to a form design by dragging the field names from the field list In addition to the text box controls in which you enter and edit data, list and combo boxes enable you to choose from a list of values List boxes limit your choice to values in the list, but combo boxes usually let you type entries, as well as choose from the list Either of these can be bound or unbound If bound, the selected or
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Part II:
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Retrieving and Presenting Information
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entered value is stored in the field to which it s bound If unbound, the value isn t stored in a table, but can be used by another control or as a search criterion
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Creating List and Combo Boxes
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Selecting a value from a list is often quicker and safer than trying to remember the correct value to type Because list and combo boxes are similar, how do you decide which type of control to use in the form
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The values in a list box are always visible and you re limited to the values in the list
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To choose from the list, click the entry and press ENTER or TAB You can also choose one of the values by typing the first letter of the value and pressing ENTER or TAB (If you have more than one value starting with the same letter, the first one is selected) You cannot enter a value that isn t on the list List boxes are best when you re limited to only a few values because, otherwise, the list box takes up valuable viewing space
The values in a combo box aren t displayed until you click the arrow to open it, so
these values take up less room on the screen than a list box Like the list box, you can select one of the values by clicking it or by typing the first few characters of the value into the text box area of the combo box If the Auto Expand property is set to Yes, the default setting, Access automatically fills in the rest of the value In addition, you can type in values that aren t in the list unless you set the combo box Limit To List property to Yes
NOTE When the characters you type match the first few characters in one of the values, the combo
box Auto Expand property specifies whether Access automatically fills in the text box portion of the combo box with a value from the underlying list As you type, Access displays the first value in the list that matches the characters If you set the Limit to List property to Yes and the combo box list is dropped down, Access automatically fills in the matching value as you type in the text box, even if the Auto Expand property is set to No List boxes and combo boxes both consist of rows of data with one or more columns, which can appear with or without headings One of the columns contains the values you want to store in the field (bound control) or use for other purposes (unbound control); the other columns contain explanatory information Figure 12-1 compares examples of list and combo boxes that contain lists of the employee last names from the Home Tech Repair database The figure also shows a text box for comparison The list box is always open, but is limited to the size you draw in the form design If the list is wider or longer than the space allowed, Access adds scroll bars The combo box list is, by default, the same width as the control in the design, but you can change the width to fit the list Scroll bars are also added to combo boxes, when necessary To add a list box or a combo box to a form design based on the Employees table, open a blank form in Design view and do the following: 1 Make sure the Control Wizard button is pressed, and then click the List Box or Combo Box tool in the toolbox 2 Click the form design or draw an outline where you want the control to appear The wizard s first dialog box opens (see Figure 12-2) For both the List Box Wizard and the Combo Box Wizard, the first dialog boxes are nearly identical
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