c# - linq beginner, foreach statement without declaration? -

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i'm reading linq dummies stuff , got question. here code:

private void btntest_click(object sender, eventargs e) {     // create array data source.     string[] querystring = { “one”, “two”, “three”, “four”, “five” };      // define query.     var thisquery = stringvalue in querystring                      stringvalue.length > 3                     select stringvalue + “\r\n”;      // display result.     foreach (var thisvalue in thisquery)         txtresult.text = txtresult.text + thisvalue; }

what txtresult, work without declaration?

txtresult value of name property of used textbox control in code. need add textbox in application , assign name property value 'txtresult' code work.


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