How To use option button and dropdwon Button more specifically?

Hi Gender,

Option button:

1.    RadioButton: select only one option from several options.
Features:
   1) All the option names can be directly seen.
   2) The count of the options cannot be too many.
Details:
http://msdn.microsoft.com/en-us/library/system.windows.forms.radiobutton.aspx

2.    CheckBox: select multiple options from several options.  
Features:
   1) All the option names can be directly seen.
   2) The count of the options cannot be too many.
   3) You can select more than one option.
Details:
http://msdn.microsoft.com/en-us/library/system.windows.forms.checkbox.aspx

DropDown button:

1.    ComboBox(the ComboBoxStyle property is DropDown): select a value from a list of values or enter a custom value.
Features:
   1) The values can be seen when you click the drop down button. You cannot directly see all the values.
   2) The count of the values can be large. If so, the scroll bar would show.
   3) You can select or enter one value.
Details:
http://msdn.microsoft.com/en-us/library/system.windows.forms.combobox.aspx

2.    ComboBox(the ComboBoxStyle property is DropDownList): select a value from a list of values.
Features:
   1) The values can be seen when you click the drop down button. You cannot directly see all the values.
   2) The count of the values can be large. If so, the scroll bar would show.
   3) You can only select one value from the list.
Details:
http://msdn.microsoft.com/en-us/library/system.windows.forms.combobox.aspx

Regards,
Aland Li

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