C# determines whether the string is int/double (instance)

Without further ado, please see the code

using ;
/// &lt;summary&gt;
/// Determine whether the string is int/double/// &lt;/summary&gt;
public static bool IsIntOrDouble(string strNumber)
{
 Regex objNotNumberPattern = new Regex("[^0-9.-]");
 Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*");
 Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*");
 const string strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$";
 const string strValidIntegerPattern = "^([-]|[0-9])[0-9]*$";
 Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")");
 return !(strNumber) &amp;&amp;
  !(strNumber) &amp;&amp;
  !(strNumber) &amp;&amp;
  (strNumber);
}

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