How do I validate a textbox to only contain numbers?

Question

如果用户在文本框中输入非数字和数字值，如何只保留数字部分？

Answer 1

Set the property "CausesValidation" to true. Set your validation to accept only an int or whatever sort of number you are looking for.

Perhaps see: Number validation in required field validator

Answer 2

You can use RegularExpressionValidator

Validate it against your control, with the validation Expression of {0:d} to permit only digits or {0:w} for letters and numbers as well.

Answer 3

您可以绑定到keydown事件，并且如果密钥不是0-9，则将其设置为true。