android - When I add a new item in Listview previous values ​​are deleted -

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When I add a new item to my ListView, it is losing the values ​​present. This was added only to the new value that was added. The goal is to add a new value without losing the existing ones. My code: 

  list & lt; String & gt; List = new list & lt; String & gt; (); Zero btnAddItem_Click (object sender, EventArgs e) {ArrayAdapter & lt; String & gt; Adapter; String edttxNewItem = FindViewById & lt; Editingtext & gt; (Resource.ind.nuitim). Text; ListView ListItm = SearchWebID & lt; ListView & gt; (Resource.ind.listoff items); List.Add (edttxNewItem); Adapter = New Arrayheader & lt; String & gt; (This, Android. Resource Layout. Simplelist ITM1, list); ListItems.Adapter = Adapter; ListItems.DeferNotifyDataSetChanged (); }

I am unfamiliar with xamarin , but It looks like you are trying to create a listview example on btnAddItem_Click

then start listItems in the form of oncreate method 

  listItems = FindViewById & lt; ListView & gt; (Resource.ind.listoff items); Define as

and listItems class variables.

and adapter are called in the btnAddItem_Click , OnCreate method. 

  adapter = new array adapter & lt; String & gt; (This Android. Resource Layout, Simple List ITM1, List); Add  listItems  to   
 in  btnAddItem_Click  just  edttxNewItem  and  notifydatasetchanged  Code> xamarin  in

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