c# - Common factor with radio button/textbox/combobox/datetimepicker -

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I have many controls, each control with a different number of controls. I control the "value" of each control name And want to serial the XML with the control "state". 

  This will be textbox for a textbox. Text, there will be radioactivity for a radio explosion. Check, for a datetime picture, this will be a date-time picture. The original   
 Is there any general factor or "state" in a different way to get these different words in no ordinary way?   
 
 
 It is not so, and for good reason - all those data values ​​are different types, And defined by the child class (hence they are not defined by a common interface).  
 For the argument, suppose that  is  one way to get that value (say, as a function:  object getValue (control control) ). If you want to use the return value of this function, you have to use a  case  statement to get the type and use it correctly!  
 Just a  case  statement

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