Check if a string is a double number in CSharp

using System;/*from  www.j a  va 2s  .c  o m*/
using System.Data;
using System.Text.RegularExpressions;

class Class1{
        static void Main(string[] args){
      string IsNotNum = "111west";
      string IsNum = "  +111  ";
      string IsFloat = "  23.11  ";
      string IsExp = "  +23 e+11  ";
      
      Console.WriteLine(IsNumericFromTryParse(IsNum));    // True
      Console.WriteLine(IsNumericFromTryParse(IsNotNum));    // False
      Console.WriteLine(IsNumericFromTryParse(IsFloat));    // True
      Console.WriteLine(IsNumericFromTryParse(IsExp));    // False
        }
    public static bool IsNumericFromTryParse(string str)
    {
      double result = 0;
      return (double.TryParse(str, System.Globalization.NumberStyles.Float, System.Globalization.NumberFormatInfo.CurrentInfo, out result));
    }
}