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private void checkBoxX5_CheckedChanged(object sender, EventArgs e)
{
if (checkBoxX5.Checked)
{
comboTree1.Enabled = true;
CaseType();
}
else
{
comboTree1.DataSource = null;
//comboTree1.DisplayMembers = null;
//comboTree1.ValueMember = null;
//comboTree1.GroupingMembers = null;
//comboTree1.Enabled = false;
}