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How to check if combobox value is empty?

How to check if combobox value is empty?

Note: SelectedIndex will be set to -1 when SelectedValue is blank ONLY when FormattingEnabled is true. See here. The code should work. Although I will also set SelectedIndex as well…… you mean “When I dont touch it, the program will start without message box. Whats wrong?” is there any code related with “touch it”

What happens when no item is selected in combobox?

I wanted that a message box opens when no item is selected so I tried this: That works fine but only if I click into the field in the combobox. When I dont touch it, the program will start without message box. Whats wrong? Note: SelectedIndex will be set to -1 when SelectedValue is blank ONLY when FormattingEnabled is true. See here.

How to set the default value for combobox?

When going to set the text property for a ComboBox. Selected ComboBox -> Property -> Text : “–Select–“. Design page shows the given text. But when run the application the given text disappeard and the initial index value of a comboBox item appeared, Which is from the DataSource.

When does combo box.selected index changed event occur?

Combo Box. Selected Index Changed Event System. Windows. Forms Occurs when the SelectedIndex property has changed. The following code example demonstrates how to initialize a ComboBox control by setting the MaxDropDownItems and DropDownStyle properties and using the FindStringExact methods to search the ComboBox.

How to add blank row in combobox stack?

Thus you can’t modify Items when you are are bound to DataSource, then only option to add blank row is modifying your data source. Create some empty object and add it to data source. E.g. if you have list of some Person entities bound to combobox:

Why does combobox not clear as cmb.clear ( )?

Answer for your question is: If you have applied datasource to combobox, then it will not be cleared as cmb.Items.Clear (). For that you have to assign datasource null to combobox. If there is value binding part for your combobox.

What to do when combobox is not data bound?

When ComboBox is not data-bound, I’ve found I need both: Clear () removes the items but still leaves the SelectedItem ‘s text, while ResetText () removes that text. VS2008. if you have a binding on it. Answer for your question is: If you have applied datasource to combobox, then it will not be cleared as cmb.Items.Clear ().

How to clear DataSource null in combobox?

If you have applied datasource to combobox, then it will not be cleared as cmb.Items.Clear (). For that you have to assign datasource null to combobox. If there is value binding part for your combobox. Use below code to clear its value: If it doesn’t read that well its, remove all items. and it’s done.