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private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
MessageBox.Show("CheckedChanged");
}
private void checkBox1_CheckStateChanged(object sender, EventArgs e)
{
MessageBox.Show("CheckedStateChanged");
}
private void button6_Click(object sender, EventArgs e)
{
this.checkBox1.CheckState = CheckState.Indeterminate;
}