This is because & in shortcuts, buttons, and menus has a prefix for accessing key characters, that is, those characters that you can press with Alt to directly focus on the control.
label1.UseMnemonic = false;
get rid of this behavior.
From the UseMnemonic documentation:
true if the label does not display the ampersand character and underscores the character after the ampersand in its displayed text and processes the underlined character as an access key; otherwise false if the ampersand character is displayed in the control text. The default is true .
If you need to display & and passkey behavior, you need to escape & like && , as mentioned by several other answers.
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