该控件可以扩展到ASP.NET CheckBox,一组都添加该扩展的复选框只要设置相同的key，那么一次就只有一个复选框能被选中（Checked），类似Radio Button。The use of checkboxes however allows you to choose to uncheck a value which is not possible normally with radio buttons. This also provides a more consistent and expected interface than using javascript to allow the de-selection of a RadioButton item.

      
     
 
      
 
      
        
        
          
                     IS over 25 Years of Age 
          
                     IS over 35 Years of Age 
          
                     IS over 45 Years of Age 
         
         
          
 
          
 
           
          
 
          
 
           
          
 
          
 
           
         
        
      
     

 

TargetControlID - The ID of the CheckBox to Modify.

key - The Unique key to use to associate checkboxes.This key does not respect INamingContainer renaming.