CheckBoxList1_SelectedIndexChanged does not get fired

[LouFfweew]

I have checkboxlist. User is able to check multiple checkboxes.I want to fetchcheckboxe's text.So I wrote like this.But my event(CheckBoxList1_SelectedIndexChanged) does not get fire.I already made checkboxlist's autopostback = "true".\[code\]string str = string.Empty;for (int i = 0; i < CheckBoxList1.Items.Count; i++){if (CheckBoxList1.Items.Selected){str = CheckBoxList1.Items.Text;str = str +',';}}str = str.TrimEnd(',');\[/code\]