Question

I am writing this code the text Change event but it is showing the error that is string is not valid.

 DateTime ts=Convert.ToDateTime(Joiningdate.Text);
   DateTime dt1=ts.AddMonths(6);
    txtcd.Text = dt1.ToShortDateString();

Answer 1

The DataTime format does not match the format you need to convert string to DateTime object. You can use DateTime.ParseExact() to give you format you date you have.

Assuming you have format dd/MM/YY for the textbox

DateTime ts= DateTime.ParseExact(Joiningdate.Text, "dd/MM/yy", CultureInfo.InvariantCulture);
DateTime dt1=ts.AddMonths(6);
txtcd.Text = dt1.ToShortDateString();