Posted by : Sudhir Chekuri Monday, 15 February 2016

It allows you to check multiple or even all of the checkboxes.

Default event: CheckedChanged

Checked changed event is fired every time when a user select or deselect the checkbox.

private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                checkBox1.Text = "Selected";
            }
            else
            {
                checkBox1.Text = "Not Selected";
            }
        }

Checked: Determines if the checkbox is checked.
CheckState: Tells whether the checkbox is Checked, Unchecked.
ThreeState: If true, the checkbox can accept an Intermediate state.

Example to show selected items using checkboxes on button click

  private void button1_Click(object sender, EventArgs e)
        {
            string items = String.Empty;

            if (checkBoxSoap.Checked)
                items += "\n Soap";
            if (checkBoxShampoo.Checked)
                items += "\n Shampoo";
            if (checkBoxToothpaste.Checked)
                items += "\n Toothpaste.";


            MessageBox.Show("You have bought: " + items);
        }

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