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c# 窗体程序如何限制textBox1

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c# 窗体程序如何限制textBox1

如何限制textBox1 禁止输入指定的数字比如 123456

因该咋写 = =！！！


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.NET 的控件有一个Control.Validating事件，可以验证输入的内容


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