Forms Data Controls :: Show View In Grid View?

i have created a simple view, and display it into gridview.. i have successfully created view but it is not shown in grid view , it return nothing...

protected void Button3_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(@"Data Source=.SQLEXPRESS;AttachDbFilename=E:
arenHDI-AJAX-TK-Calendar-CSApp_DataDatabase.mdf;Integrated Security=True;User Instance=True");
con.Open();
SqlCommand cmd = new SqlCommand("select * from nview", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
con.Close();
}