How to assign Database path in F drive sqlconnection c# website ?

SqlConnection cn = new SqlConnection("Data      Source=.\\SQLEXPRESS;AttachDbFilename=F:\\Database.mdf;Integrated Security=True;User      Instance=True");
            SqlCommand cmd = new SqlCommand("SELECT * FROM stu1", cn);
            SqlDataAdapter adp = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            adp.Fill(ds);
            GridView1.DataSource = ds.Tables[0];
            GridView1.DataBind();