c# Is Numeric Function

Just a quick function which I found online some time ago.

public
static System.Boolean IsNumeric(System.Object Expression)
{
if (Expression == null || Expression is DateTime)
return false;
if (Expression is Int16 || Expression is Int32 || Expression is Int64 || Expression is Decimal || Expression is Single || Expression is Double || Expression is Boolean)
return true;
try
{
if (Expression is string)
Double.Parse(Expression as string);
else
Double.Parse(Expression.ToString());
return true;
}
catch { } // just dismiss errors but return false
return false;
}