c# - check detail view null fields before inserting -

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I am looking at detail in asp.net, from which I am going to put data to DB. Here I want to do any inquiry before joining. Field is zero or not and if not empty then do not insert in DB. I have tried the following code but it is not working 
  Protected Zero DetailsView1_ItemInserting (Object Sender, DetailsViewInsertEventArgs E) {string unit = (string) e.Values ​​["UNT_COD"]; If (unt == "") {e.Cancel = true; }}   
 Through this code, I am not receiving my purpose. Plz helps someone know how to check me   < P> 
 
  string unt = e.values ​​["UNT_COD"] + ""; If (unt == "") {e.Cancel = true; }

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