how to retrive a data in grid view

protected void uxRoleCheckBoxSelector_CheckChanged(object sender, EventArgs e)
        {
            // Cast sender to CheckBox
            CheckBox activeCheckBox = (CheckBox)sender;
            // Retrieve the row where CheckBox is contained (NamingContainer used to retrive parent control
            GridViewRow row = (GridViewRow)activeCheckBox.NamingContainer; 
            // Retrive the Lable for an User name in a row
            Label myUserName = (Label)row.FindControl("uxUserNameLabelDisplayer");

            GridViewRow user = (GridViewRow)myUserName.NamingContainer;
            MembershipUser myUser = (MembershipUser)user.DataItem;


            if (activeCheckBox.Checked == true)
            {
                uxMessageDisplayer.Text = "T - Aproved User";
                myUser.IsApproved = true;
                Membership.UpdateUser(myUser);
            }
            else
            {
                uxMessageDisplayer.Text = "F - NOT Aproved User";
                myUser.IsApproved = false;
                Membership.UpdateUser(myUser);
            }
        }

 SqlConnection cn = new SqlConnection("Your ConnectionsString here");
SqlCommand cmd = new SqlCommand("Query to Retrieve data from                database",cn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds, "Data");

gridview.DataSource = ds.Tables[0];
gridview.DataBind();