How do I access input item from listview.

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C#

ASP.NET

ListView

TextBoxBase

Hi all .
I coudn't understand how i can acess item in listview programmatically . I have textbox in my listview:

  <asp:ListView ID="ListView1" ... EnableViewState="false" 
        runat="server"  >
... <EditItemTemplate>
            <tr> ...

 <td>
                    <asp:TextBox runat="server"  OnTextChanged="Commenary_TextChanged"   id="Commenary"/></td>
                     <td>

I need to take text from textbox and save it in string variable . How i can make it?

What I have tried:

I try to find it in my listview like this :

var item = ListView1.FindControl("Commentary");
string asd = item.ToString();

And like this:

TextBox tmpControl = (TextBox)ListView1.FindControl("Commentary");
string  xxx = tmpControl.Text.ToString();

I have null in both situarion.
Also i tried to change textbox to input tag, but i have nothing too.