c# - making a text field read only -

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I am using the code below to read only the text entry, but this is not read only This is why 

  @ Html.EditorFor (model => model.UserName, new {readonly = "readonly"})    
 
 
 why you use  
  @ Html.EditorFor (model => model UserName, new {@readonly = true}); Using   
 or you  
  @ Html.EditorFor (model => model.UserName, new {@readonly = "readonly"}) Can;

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