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
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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.) |
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