使用WebBrowser控件，我如何自动将鼠标移动到网页上的文本框，键入一些文本，然后以编程方式提交表单？
这真的是不可能的，至少没有一堆丑陋的黑客。
主要的问题是，您需要一些方法来识别您希望键入的文本框控件。这很可能意味着您需要自己设计HTML表单，这样您才能知道它的ID是什么。
If you have a particular website in mind, and you can assume that it s DOM will stay the same for as long as your application needs to continue working (yeah, right), you can try the hacks suggested here: Automating Facebook Login using WebBrowser Control in C#
但只要说这对我来说是一个非常糟糕的设计就足够了。考虑到网络内容的动态特性，自动化很难做到这一点，而且这个特定的实现比大多数实现都要棘手。
如果你只需要打开一些网址，填写表格并提交，我建议你使用WatiN。它用于测试，但应该完成工作。
如果您想将文本框中的值发布到页面，您可以使用HttpWebRequest，如下所示例如链接
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