Below code to find the number of days from the given number of weeks.
Put this code in .aspx.cs.
protected void Button1_Click(object sender, EventArgs e)
int NoOfweek = Convert.ToInt32(TextBox1.Text);
int NoOdDays = NoOfweek * 7;
Label2.Text = "Total No of Days " + NoOdDays.ToString();
I hope it will help for you.
"IF YOU WANT TO SHINE LIKE A SUN FIRST YOU HAVE BURN LIKE IT".