c# - RadioButtonList Choosing specific index -

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I'm having trouble writing an I statement with the selected index of the radion button list. Below I have my code. 

  If (radio button list selected value = 1) {//}} I have a radio boot list with three separate indexes I can say something like this if  selectedvalue = index [1]?  
 
 
 
 Try it 
 
 To set the index: 
 
  radio button list. Selected index = index;  
 
 To set the value: 
 
  Radio Button List. Selected Values ​​= Val; To check the selected index,

code 

  if (radio button.list.selected index = = Index) {}  <
 
  if (radio button list. Select value == well) {}

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