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copied!<p>I found the answer:</p> <blockquote> <p>Char.IsNumber() determines if a Char is of any numeric Unicode category. This contrasts with IsDigit, which determines if a Char is a radix-10 digit.</p> <p>Valid numbers are members of the following categories in <a href="http://msdn.microsoft.com/en-us/library/system.globalization.unicodecategory.aspx" rel="noreferrer" title="Decimal digit character, that is, a character in the range 0 through 9. Signified by the Unicode designation "Nd" (number, decimal digit). The value is 8.">UnicodeCategory</a>:</p> <ol> <li><strong><code>DecimalDigitNumber</code></strong><br> Decimal digit character, that is, a character in the range 0 through 9. Signified by the Unicode designation "Nd" (number, decimal digit). The value is 8.</li> <li><strong><code>LetterNumber</code></strong><br> Number represented by a letter, instead of a decimal digit, for example, the Roman numeral for five, which is "V". The indicator is signified by the Unicode designation "Nl" (number, letter). The value is 9.</li> <li><strong><code>OtherNumber</code></strong><br> Number that is neither a decimal digit nor a letter number, for example, the fraction 1/2. The indicator is signified by the Unicode designation "No" (number, other). The value is 10.</li> </ol> </blockquote> <h2>Conclusion</h2> <ul> <li><strong><code>Char.IsDigit</code></strong>:<br> Valid digits are members of the <code>DecimalDigitNumber</code> category only.</li> <li><strong><code>Char.IsNumber</code></strong>:<br> Valid numbers are members of the <code>DecimalDigitNumber</code>, <code>LetterNumber</code>, or <code>OtherNumber</code> category.</li> </ul>

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