How to bind dynamic header and columns in gridview

<asp:GridView ID="GridView1" runat="server" DataKeyNames="ID"
    AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound"
    OnRowUpdating="GridView1_RowUpdating"
    OnRowCancelingEdit="GridView1_RowCancelingEdit"
    OnRowEditing="GridView1_RowEditing"
    HeaderStyle-BackColor="CornflowerBlue" HeaderStyle-Font-Bold="true" HeaderStyle-ForeColor="White" CellPadding="5">

    <Columns>

        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />
        <asp:BoundField DataField=""  />


        <asp:CommandField ShowEditButton="True" />

        <asp:CommandField ShowDeleteButton="True" />

    </Columns>
</asp:GridView>

private void Bind_CheckBoxList()
{
    DataTable dtusers;
    DataTable dtregions;
    //String SQL = "SELECT P.ID ID, P.Name Name, P.Description Description, B.REGION_ID, B.REGION" +
    //            " FROM Product P, REGION_CONFIG B" +
    //            " WHERE P.BrandID=B.REGION_ID";

    String SQLUsers = "select [USER_ID],USER_FIRST_NAME,USER_LAST_NAME from  USER_INFO";
    String SQLRegions = "select REGION_ID,REGION from REGION_CONFIG";


    string sConstr = ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString;
    using (SqlConnection conn = new SqlConnection(sConstr))
    {
        using (SqlCommand comm = new SqlCommand(SQLUsers, conn))
        {
            conn.Open();
            using (SqlDataAdapter dausers = new SqlDataAdapter(comm))
            {
                dtusers = new DataTable("tbl");
                dausers.Fill(dtusers);
            }
        }
        using (SqlCommand comm = new SqlCommand(SQLRegions, conn))
        {
            using (SqlDataAdapter daregions = new SqlDataAdapter(comm))
            {
                dtregions = new DataTable("tbl");
                daregions.Fill(dtregions);
            }
        }
    }

    //DataTable dtAll;
    //dtAll = dtusers.Copy();
    //dtAll.Merge(dtregions);

    GridView1.DataSource = dtusers;
    GridView1.DataBind();
}



protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    DataTable dt;
    String SQL = "SELECT REGION FROM REGION_CONFIG";

    string sConstr = ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString;
    using (SqlConnection conn = new SqlConnection(sConstr))
    {
        using (SqlCommand comm = new SqlCommand(SQL, conn))
        {
            conn.Open();
            using (SqlDataAdapter da = new SqlDataAdapter(comm))
            {
                dt = new DataTable("tbl");
                da.Fill(dt);
                //DataRow row;
                //row = dt.NewRow();
                //dt.Rows.Add(row);
               // dt.Columns.Add(new DataColumn("Nametest", typeof(string)));
            }
        }
    }

    if (dt.Rows.Count > 0)
    {
        for (int i = 0; i < dt.Columns.Count; i++)
        {
            BoundField boundField = new BoundField();
            if (dt.Columns[i].ColumnName.ToString() != "Name")
            {
                boundField.DataField = dt.Columns[i].ColumnName.ToString();
                boundField.HeaderText = dt.Columns[i].ColumnName.ToString();
                GridView1.Columns.Add(boundField);

            }

        }
    }


    if (e.Row.RowType == DataControlRowType.Header)
    {

        for (int i = 0; i < dt.Rows.Count; i++)
        {
            string strRegion;
            strRegion = dt.Rows[i]["REGION"].ToString();
            if (strRegion != "")
            {
                e.Row.Cells[i].Text = dt.Rows[i]["REGION"].ToString();
            }

        }


    }
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            string strRegion;
            strRegion = dt.Rows[i]["REGION"].ToString();
            if (strRegion != "")
            {
                CheckBox cb = new CheckBox();
                e.Row.Cells[i].Controls.Add(cb);
            }

        }


        if ((e.Row.RowState & DataControlRowState.Edit) > 0)
        {
            //CheckBoxList chkBrandedit = (CheckBoxList)e.Row.FindControl("CheckBoxList1");

            //chkBrandedit.DataSource = dt;
            //chkBrandedit.DataTextField = "Name";
            //chkBrandedit.DataValueField = "ID";
            //chkBrandedit.DataBind();
            //chkBrandedit.SelectedValue = ((DataRowView)e.Row.DataItem)["BrandID"].ToString();
        }
    }
}