how to bind data into gridview in asp.net

Question

protected void PageDropDownList_SelectedIndexChanged(Object sender, EventArgs e)
    {
        GridViewRow pagerRow = gvDetails.BottomPagerRow;
        DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");
        gvDetails.PageIndex = pageList.SelectedIndex;
    }
    private void BindGrid()
    {
        //Set your connection String here
        SqlConnection CN = DBUtil.GetCon();
        if (CN.State != ConnectionState.Closed)
            CN.Close();
        CN.Open();
        string q = "SELECT Head_Code,Head_Name,Section_Code,Head_Mode,Head_Type,Head_Status FROM eLogs_Acc_Account_Master";
        SqlCommand cmd = new SqlCommand(q, CN);
        //SqlConnection cn = new SqlConnection("Data Source=.;Initial Catalog=Northwind;Integrated Security=True");
        ////Write a select Query
        //string q = "select CustomerID,CompanyName,ContactName,Phone,City,Country  from Customers";
        DataSet dset = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter(q, CN);
        //cn.Open();
        DataTable dtable = new DataTable();
        da.Fill(dtable);
        //Bind grid.
        gvDetails.DataSource = dtable;
        gvDetails.DataBind();
        CN.Close();
    }
    protected void gvDetails_DataBound(object sender, EventArgs e)
    {
        GridViewRow pagerRow = gvDetails.BottomPagerRow;        
        if (pagerRow == null) return;
        DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");
        if (pageList == null) return;
        Label pageLabel = (Label)pagerRow.Cells[0].FindControl("CurrentPageLabel");
        for (int i = 0; i < gvDetails.PageCount; i++)
        {
            int pageNumber = i + 1;
            ListItem item = new ListItem(pageNumber.ToString());
            if (i == gvDetails.PageIndex)
            {
                item.Selected = true;
            }
            pageList.Items.Add(item);
        }
        if (pageLabel != null)
        {
            int currentPage = gvDetails.PageIndex + 1;
        }
        gvDetails.DataBind();
    }

Here i m not able to view data in the grid it displaying empty page