ComboBox (cbo)

Combobox - Allows the user to either select an item from a drop-down box or enter a different item.

Both the ComboBox and ListBox controls are derived from the ListControl class

Examples

Useful Code

ComboBox1.Items.Add "Item 1" 
ComboBox1.Items.Add "Item 2" 
ComboBox1.SelectedIndex = 0

DataSource

objDataTable = New System.Data.DataTable 
objDataTable.TableName = "Applications" 
objDataTable.Columns.Add("ArticleApplication", GetType(System.String)) 
For Each objDataRow In clsDatabase.mobjDataSet.Tables("ApplicationNames").Rows 
   objDataRowNew = objDataTable.NewRow() 
   objDataRowNew("ArticleApplication") = objDataRow("ArticleApplication") 
   objDataTable.Rows.Add(objDataRowNew) 
Next 
ComboBox1.DropDownStyle = ComboBoxStyle.DropDownList 
ComboBox1.DataSource = objDataTable 
ComboBox1.DisplayMember = "ArticleApplication"

Properties

AllowSelection	Gets a value indicating whether the list enables selection of list items. (Inherited from ListControl.)
AutoCompleteMode	(Added in 2.0) Gets or sets an option that controls how automatic completion works for the ComboBox.
AutoCompleteSource	Gets or sets a value specifying the source of complete strings used for automatic completion.
DataManager	Gets the CurrencyManager associated with this control. (Inherited from ListControl.)
DataSource	Gets or sets the data source for this ComboBox.
DisplayMember	Gets or sets the property to display for this ListControl. (Inherited from ListControl.)
DropDownHeight	Gets or sets the height in pixels of the drop-down portion of the ComboBox.
DropDownStyle	Gets or sets a value specifying the style of the combo box.
DropDownWidth	Gets or sets the width of the of the drop-down portion of a combo box.
DroppedDown	Gets or sets a value indicating whether the combo box is displaying its drop-down portion.
FlatStyle	Gets or sets the appearance of the ComboBox.
Focused	Overridden. Gets a value indicating whether the ComboBox has focus.
FormatString	Gets or sets the format-specifier characters that indicate how a value is to be displayed. (Inherited from ListControl.)
FormattingEnabled	Gets or sets a value indicating whether formatting is applied to the DisplayMember property of the ListControl. (Inherited from ListControl.)
IntegralHeight	Gets or sets a value indicating whether the control should resize to avoid showing partial items.
ItemHeight	Gets or sets the height of an item in the combo box.
Items	Gets an object representing the collection of the items contained in this ComboBox.
MaxDropDownItems	Gets or sets the maximum number of items to be shown in the drop-down portion of the ComboBox.
MaxLength	Gets or sets the number of characters a user can type into the ComboBox.
PreferredHeight	Gets the preferred height of the ComboBox.
SelectedIndex	Problems when populating before control is displayed. Overridden. Gets or sets the index specifying the currently selected item.
SelectedItem	Gets or sets currently selected item in the ComboBox.
SelectedText	Gets or sets the text that is selected in the editable portion of a ComboBox.
SelectedValue	Problems when populating before control is displayed. Gets or sets the value of the member property specified by the ValueMember property. (Inherited from ListControl.)
SelectionLength	Gets or sets the number of characters selected in the editable portion of the combo box.
SelectionStart	Gets or sets the starting index of text selected in the combo box.
Sorted	Gets or sets a value indicating whether the items in the combo box are sorted.
Text	Overridden. Gets or sets the text associated with this control.
ValueMember	Gets or sets the property to use as the actual value for the items in the ListControl. (Inherited from ListControl.)

Methods

Add	Adds an item to the list of items
AddRange	Adds an array of items to the list of items
AddItemsCore	Adds the specified items to the combo box.
BeginUpdate	Maintains performance when items are added to the ComboBox one at a time.
Dispose	Overloaded. Releases the resources used by the ComboBox.
EndUpdate	Resumes painting the ComboBox control after painting is suspended by the BeginUpdate method.
FilterItemOnProperty	Overloaded. Returns the current value of the ListControl item, if the item is a property of an instance of the ListControl class. (Inherited from ListControl.)
FindString	Overloaded. Finds the first item in the ComboBox that starts with the specified string.
FindStringExact	Overloaded. Finds the item that exactly matches the specified string.
GetItemHeight	Returns the height of an item in the ComboBox.
GetItemText	Returns the text representation of the specified item. (Inherited from ListControl.)
OnClick	Raises the Click event. (Inherited from Control.)
RefreshItem	Overridden. Refreshes the item contained at the specified location.
RefreshItems	Overridden. Refreshes all ComboBox items.
ResetText	Overridden.
Select	Overloaded.
SelectAll	Selects all the text in the editable portion of the ComboBox.
SetBoundsCore	Overridden. Sets the size and location of the ComboBox.
ToString	Overridden. Returns a string that represents the ComboBox control.

Events

BackgroundImageChanged	Occurs when the value of the BackgroundImage property changes.
BackgroundImageLayoutChanged	Occurs when the BackgroundImageLayout property changes.
DrawItem	Occurs when a visual aspect of an owner-drawn ComboBox changes.
DropDown	Occurs when the drop-down portion of a ComboBox is shown.
DropDownClosed	Occurs when the drop-down portion of the ComboBox is no longer visible.
DropDownStyleChanged	Occurs when the DropDownStyle property has changed.
Format	Occurs when the control is bound to a data value. (Inherited from ListControl.)
FormatInfoChanged	Occurs when the value of the FormatInfo property changes. (Inherited from ListControl.)
FormatStringChanged	Occurs when value of the FormatString property changes (Inherited from ListControl.)
FormattingEnabledChanged	Occurs when the value of the FormattingEnabled property changes. (Inherited from ListControl.)
MeasureItem	Occurs each time an owner-drawn ComboBox item needs to be drawn and when the sizes of the list items are determined.
SelectedIndexChanged	Occurs when the SelectedIndex property has changed.
SelectedValueChanged	Occurs when the SelectedValue property changes. (Inherited from ListControl.)
SelectionChangeCommitted	Occurs when the selected item has changed and that change is displayed in the ComboBox.
TextUpdate	Occurs when the control has formatted the text, but before the text is displayed.
ValueMemberChanged	Occurs when the ValueMember property changes. (Inherited from ListControl.)