وجدت الحل
Private Void TextBox1.Text TextChanged ( object sender , EvetArgs e )
If ( TextBox1.Text ==" ")
{
}
else
}
Try
}
Date Time1.Text = Date Time2.Value.AddDays(int.Parse(TextBox1.Text)).ToString();
{
catch (Exception ex)
}
MessageBox.Show (ex.ToString())
{
{