try to find out in the following way.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="CompanyName" HeaderText="Company"/>
<asp:BoundField DataField="ContactName" HeaderText="Name"/>
<asp:BoundField DataField="ContactTitle" HeaderText="Title"/>
<asp:BoundField DataField="Address" HeaderText="Address"/>
</Columns>
</asp:GridView>