C# determines whether a string is a number (instance)

Without further ado, please see the code

/// &lt;summary&gt;
/// Determine whether the string is a number/// &lt;/summary&gt;
public static bool IsNumber(string s)
{
 if ((s)) return false;
 const string pattern = "^[0-9]*$";
 Regex rx = new Regex(pattern);
 return (s);
}

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