DataSource Controls :: View The Linq Variable Data In C#?

I wrote a linq code to read from database if its value is equal to textBox that user enters.

I dont wanna show the result in Gridview,so jz I wanna use that value. The code I wrote is

var sql = from x in db.Managers
where x.M_Name == TextBox1.Text.ToString()
select x.M_Name;

in this code I'm selecting only the name that user entered in textBox

so i want to do like tis

String Name = sql.ToString();

means to store the value in string. so the problem is i can not assign the var to string.