c#checkedlistbox判断当前选中行是否被勾选？

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当点击被勾选的checkedlistbox的某一行时，右边的属性button 的enable=true； 当选定的未勾选时，右边的属性button 的enable=false；
if (checkedListBox1.CheckedItems.IndexOf(checkedListBox1.Items[3])<0)试过了不行
int count = SSH2_CLB.CheckedItems.Count; for (int i = 0; i < count; i++) { bool isChecked = SSH2_CLB.GetItemChecked(i); if (SSH2_CLB.GetItemChecked(i) == true) {BT_Attribute.Enabled = true;}if (SSH2_CLB.GetItemChecked(i) == false) { BT_Attribute.Enabled = false;这样也不行

当点击 checklistbox 里面勾选的项时 右边的butoon会使能 当点击checklistbox里面未勾选的项时 右边的butoon enable=false

 private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (checkedListBox1.GetItemChecked(checkedListBox1.SelectedIndex))
                button3.Enabled = true;
        }