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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Globalization;           // this is the file which needed to be used// namespace WindowsFormsApplication9 {     public partial class Form1 : Form     {         string s;         public Form1()         {             InitializeComponent();         }         private void dateTimePicker1_ValueChanged(object sender, EventArgs e)         {             s = dateTimePicker1.Value.ToString("o");                   }         private void button1_Click(object sender, EventArgs e)         {             dateTimePicker2.Value = DateTime.ParseExact(s, "o", CultureInfo.InvariantCulture);         }     } }