/// <function>NumUtil.RemoveComma</function>
/// <summary>remove thouands comma from a number string</summary>
/// <param name="strNum">string</param>
/// <returns>if it's not a number,do not convert,else return number value </returns>
/// <remarks></remarks>
public static string RemoveComma(string strNum)
{
return(StrUtil.Replace(strNum, ",", ""));
}