Control--combobox;radionbutton;timer;datagridview

ComboBox: Combo Box---Properties:

Text: The selected value

Items: item in a combo box

Add: Adding a single value

AddRange: Adding Multiple values

SelectedIndex: Index value

SelectedValue: Hidden values

DropDownStyle: drop-down box style

Remove: Delete

Clear: Clear

Cases:

Check the value of the text box

var Txt=this.combobox.text;

To add a single value

THIS.COMBOBOX.ADD ("small Black");

To add multiple values

string[]strs={"Small black", "Millet"};

This.ComboBox.AddRange ("small Black");

Select the first value

this.combobox.selectedindex=0;

Hidden values

this.combobox.selectedvalue=;

Drop-down box style is set to read-only

This.combobox.dropdownstyle=comboboxstyle.dropdownlist;

Delete the selected value

This.combobox = items.remove (TXT);

Clear the selected value

This.combobox = items.clear (TXT);

---event: selectedindexchanged: Event triggered when a drop-down box list is changed

Radionbutton: Radio Button---properties:

Checked: Whether to select

Cases:

if (this. radionbutton.checked) {

Messagerbox.show ("checked");

}else{

Messagerbox.show ("unchecked");

}

Timer: Clock Control---properties:

InterVal: time interval, Unit is milliseconds

Enavles: Turn on the clock

Cases:

Get current time

DateTime Dt=datetime.now;

Turn on the clock

This.timerl.Start ();

Set the time interval

this.timerl.interval=1000;

Stop clock

This.timerl.stop ();

DataGridView: The Underworld

Binding value: this. datagridview.datasource=table;

Checked value: this. Datagridview.selecteditems[0]. Cells[0]. Valus.tostring ();