c# - How to "Unset" Event -

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If I have a combobox click event set on the Designer.cs page during programming and then at some point in the program, Depending on some condition, now I want to click on the event to set boxbox, how do I "unset" it? I've tried the combo box name. Click + = null and I have tried to set it to another dummy function which does nothing ... neither works.

Set: 

  comboBox.Click + = EventHandler;

Unset: 

  comboBox.Click - = EventHandler;

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