How do I can set value of an input text in a website using c# ?

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Hi I want to access to this website : www.wine-searcher.com/wine-valuation-f.lml , and I want to change value of the first textbox and to submit with the button below "cotation" .
how can I do that programmatically with c# ?

I tried this but I get Null Reference Exception

this is my code :

webBrowser1.Navigate("http://www.wine-searcher.com/wine-valuation-f.lml");
webBrowser1.Document.GetElementById("wn1_input").InnerText ="TextToPut";

Thank you in advance for your answer.

Posted 31-May-14 12:43pm

Youssef Korchi

Updated 31-May-14 13:04pm

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CHill60 31-May-14 18:54pm

???

[no name] 31-May-14 19:44pm

You need to actually wait until the document loads before trying to do anything with the controls on the page.

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Octanic · Accepted Answer · 2014-05-31T14:09:00

Solution 1

Your code is just right, but you must handle the DocumentCompleted Event.

see, for example

C#

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            webBrowser1.Navigate("http://www.wine-searcher.com/wine-valuation-f.lml");

        }

        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            webBrowser1.Document.GetElementById("wn1_input").InnerText = "TextToPut";
        }
    }

hope it helps :)

Posted 31-May-14 14:09pm

Octanic

Comments

Youssef Korchi 1-Jun-14 9:37am

thanks it works ! but my input field still empty. Here is the tag where i want to change the value :

<input class="valftlt" name="wn1" id="wn1_input" type="TEXT">

Octanic 1-Jun-14 9:47am

Glad to see it worked! Remember you can always try to consume it as a webrequest, passing post parameters with the same name as the "name" attribute with the value you desire. So you don't really need to use webbrowser to do it :)

Youssef Korchi 1-Jun-14 11:43am

Actually I don't know how to do it with webrequest but it worked ,I forget to add in my Form() :

webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);

thanks Luis