Check all checkboxes in checkboxlist with one click using c#

Question

I want to have a button that once clicked, it will select all checkboxes in my checklistbox. I\'ve search the possible answers but I always see examples for asp.net and javascri

Answer 1

Try this...

    protected void chk_CheckedChanged(object sender, EventArgs e)
    {
        CheckBox[] boxes = new CheckBox[7];
        boxes[0] = this.CheckBoxID;
        boxes[1] = this.CheckBoxID;
        boxes[2] = this.CheckBoxID;
        boxes[3] = this.CheckBoxID;
        boxes[4] = this.CheckBoxID;
        boxes[5] = this.CheckBoxID;
        boxes[6] = this.CheckBoxID; //you can add checkboxes as you want

        CheckBox chkBox = (CheckBox)sender;
        string chkID = chkBox.ID;
        bool allChecked = true;

        if (chkBox.Checked == false)
            allChecked = false;

        foreach (CheckBox chkBoxes in boxes)
        {
            if (chkBox.Checked == true)
            {
                if (chkBoxes.Checked == false)
                    allChecked = false;
            }
        }
        this.CheckBoxIDALL.Checked = allChecked; //Here place the main CheckBox
    }