How Include Javascript file on condition in Page_Load

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Example:

if (!IsPostBack) {
   if ( condition ) {
      //  load javascript file like
      //  <script type="text/javascript" src = "https://File_AA.js"></script>
  }  
  else
  {
      //  <script type="text/javascript" src = "https://File_BB.js"></script>
 }
}

Based on a condition, how can I load a specific JavaScript file? Is there a better way to include only ONE file based on a condition?

1 Answers
 string file_a =  "file_a.js" ;
 string file_b =  "file_b.js" ;
 string selectedFile;
 if(condition)
    selectedFile = file_a;
 else
    selectedFile = file_b;
 string scriptText = string.Format(
             System.Globalization.CultureInfo.InvariantCulture,
             "<script type='text/javascript' src='{0}'></script>\n",
             selectedFile
             );
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(),"ScriptFile", scriptText);
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