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Hai Ranjith,
Thank you for your reply , I got my answer...
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Hi Pavithra
Try this code in dateTimePicker_Changed event
int val =Convert.ToInt16(textBox1.Text);
string theDate =this.dateTimePicker1.Value.ToString("yyyyMMdd");
DateTime dt = DateTime.ParseExact(theDate, "yyyyMMdd", CultureInfo.InvariantCulture);
dt = dt.AddMonths(val);
textBox2.Text = dt.ToString();