title: ASP.NET Set variable if Request.QueryString does not exist
body: <p>I want to set a textbox.text to a certain value if Request.QueryString['EQCN'] does not exist. If it does exist, I would like to set it to the value of Requestion.QueryString['EQCN'].</p>
  
  <p>It seems that if the value doesn't exist it defaults the value to be "".</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks so much!!!</p>