How to make the Date Time format in C#.net using DateTime Format

//=================Tochange the Date Format from MM/dd/yyyy to dd/MM/yyyy================//

       //First Assign the Date Value to a String Variable

         string urDate_Of_Appointment = TxtDateOfApp.Text; 

//Then declare a object of the method of System Define for DateTime Format  

    System.Globalization.DateTimeFormatInfo dateDate_Of_AppointmentInfo = new System.Globalization.DateTimeFormatInfo();

//Then Assign the format of the Date(dd/MM/yyy) to DateTimeFormatInfo

            dateDate_Of_AppointmentInfo.ShortDatePattern = "dd/MM/yyyy";

//Then assign the value to variable as per your DateTime Format

            DateTime validDate_Of_Appointment = Convert.ToDateTime(urDate_Of_Appointment, dateDate_Of_AppointmentInfo);

 // Assign the  value to the class object which we declare Here(Date_Of_Appointment  is variable of a object class)    

 obj.Date_Of_Appointment = validDate_Of_Appointment.ToString();

                                   OR




       string RetDateTime(string srcdate)
        {
            string resdate = "";
            try
            {
                string[] arr = srcdate.Split('/');
                if (arr.Length > 0)
                {
                    resdate = arr[2] + "/" + arr[1] + "/" + arr[0];
                }
            }
            catch (Exception)
            {
            }
            return resdate;
        }

//Apply in Control

                  generatex.FrmDate = RetDateTime(FromDate.Text); ;
                  generatex.ToDate = RetDateTime(ToDate.Text); 



Thanks
Satyabrata Behera