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asp.net webbrowser中给textarea赋值,要求换行

最近搞个googleadwords的模仿页面点击的程序,但是用程序获取textarea后,再给他赋值,仍然是空的
HtmlElement tbUser = WB.Document.All["gwt-debug-searchInput-keywordTextbox"];
MessageBox.Show(TxtContent);
tbUser.SetAttribute("value", TxtContent);

Thread.Sleep(2000);
HtmlElement btnSubmit = WB.Document.All["gwt-debug-searchPanel-searchButton"];
btnSubmit.InvokeMember("click");

用tbUser.InnerText或者tbUser.InnerHTML赋值都不行,搞不了了,请高手帮忙

googleadwords页面地址
https://adwords.google.com/o/Targeting/Explorer?__u=1568174939&__c=3373214579&__u=1568174939&__c=3373214579#search.none


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