BLL/Business.cs

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using System;
using System.Collections.Generic;
//using System.Linq;
using System.Text;

namespace BLL
{
    public static  class Business
    {

        /// <summary>
        /// 
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string GetDoublefromStr(string str)
        {
            try
            {
                if (string.IsNullOrEmpty(str))
                    return null;
                double db = Convert.ToDouble(str.Trim());
                return db.ToString();
            }
            catch
            {
                return null;
            }
        }


        public static string GetIntFromStr(string str)
        {
            try
            {
                if (String.IsNullOrEmpty(str))
                    return null;
                int i = Convert.ToInt32(str.Trim());
                string istr = i.ToString();
                return istr;
            }
            catch(Exception ex)
            {
                string exstr = ex.ToString();
                return null;
            }
        }


        public static string GetDateTimeFromStr(string str)
        {
            try
            {
                if (String.IsNullOrEmpty(str))
                    return null;
                DateTime datetime = Convert.ToDateTime(str.Trim());
                string datetimeStr = datetime.ToString();
                return datetimeStr;
            }
            catch (Exception ex)