扩展C#的TextBox类,textbox一般是用于数据输入，但许多数据是需要验证。我扩展的它，能验证多种数据，如数字，字符等。是一个很好例子。-Extended C# the TextBox class, textbox is generally used for data input, but many data requires authentication. I extended it to verify a variety of data, such as numbers, chara