if (this.comboBox1.SelectedIndex == SelectedIndex ==

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if(this.comboBox1.SelectedIndex==SelectedIndex==if(this.comboBox1.SelectedIndex==SelectedIndex==if(t

if (this.comboBox1.SelectedIndex == SelectedIndex ==
if (this.comboBox1.SelectedIndex == SelectedIndex ==

if (this.comboBox1.SelectedIndex == SelectedIndex ==
就是没有选中