c# textarea insert problems

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C#

I have a website, there are some text areas I want to fill programically.
I open the website in my webbrowser1 control in my c# application and I have made a function Settext. This function works really well with textboxes, but seems to fail with text areas, any ideas why?

SetText("name" "details" "Hello"); But it doesnt work. Any ideas?

<textarea name="details" id="details" cols="35" wrap="physical" rows="1"  önfocus="this.style.height='55px';" style="width: 300px; height: 55px;"></textarea>


SetText(string attribute, string attName, string value)
        {


            Skybound.Gecko.GeckoElementCollection tagsCollection = ((Skybound.Gecko.GeckoWebBrowser)(tabControl2.SelectedTab.Controls[0])).Document.GetElementsByTagName("textarea");

            foreach (Skybound.Gecko.GeckoElement currentTag in tagsCollection)
            {

               // MessageBox.Show(currentTag.GetAttribute(attribute));
                // If the attribute of the current tag has the name attName

                if (currentTag.GetAttribute(attribute).Equals(attName))
                {

                    // Then set its attribute "value".

                    currentTag.SetAttribute("value", value);

                    currentTag.Focus();
                }
            }



            //  SendKeys.Send("{ENTER}");

        }