[Solved] ASP.Net GridView Error: does not contain a property with the name

I want to bind 2 different datatable to gridview and ignore when have error "does not contain a property with the name" can ignore this error and let textbox value still null

<asp:TemplateField ItemStyle-Width="60px"> 
    <ItemTemplate>
        <asp:TextBox ID="TextBox1" runat="server" Width="100%"  Text='<%# Eval("total_df") %>'  CssClass="har"></asp:TextBox>
    </ItemTemplate>
</asp:TemplateField>

        protected void GrAdd()
        {            
            if (stat == "1")
            {
                try
                {
                    conn = new SqlConnection();
                    conn.ConnectionString = strconn;
                    conn.Open();
                    string sql1 = "select * from testresultdetailfix where poid = '" + poid + "'";
                    SqlDataAdapter da;
                    dtgradd = new DataTable();
                    da = new SqlDataAdapter(sql1, conn);
                    da.Fill(dtgradd);
                    GridAdd.DataSource = dtgradd;
                    GridAdd.DataBind();
                    conn.Close();
                }
                catch (Exception)
                {

                }
            }
            else if (stat == "2")
            {
                conn = new SqlConnection();
                conn.ConnectionString = strconn;
                conn.Open();
                string sql1 = "select * from testdetailfix where poid = '" + poid + "' and fix_time = " + ftime + " order by poid,productid,color,size";
                SqlDataAdapter da;
                dtgradd = new DataTable();
                da = new SqlDataAdapter(sql1, conn);
                da.Fill(dtgradd);
                conn.Close();
                GridAdd.DataSource = dtgradd;
                GridAdd.DataBind();
                conn.Close();
            }          
        }