asp.net photo upload

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ASP.NET

how to upload photo or image using textbox,button and image control, i struck at writing code
at
string query =insert into enquirytable values("'" +TxtPhoto.Text+"'");

for a insert query what i write txtphoto.? for photo to store in database, and
create table called enquirytable in that i gave image datatype as binary

pls help me out; i think below sorce code of my page design will help u ......

<form id="form1"  runat="server">
    <div align="center">
    
 <asp:Image ID="Imgstudent" runat="server" 
            Height="100px" Width="128px" />
     </div>
    <table class="style1">
        <tr>
            <td align="right" class="style3">
                Photograph</td>
            <td class="style2">
       <asp:TextBox ID="TxtPhoto" runat="server">
                            </td>
            <td>
   <asp:Button ID="BtnBrowse" runat="server" Font-Bold="True" Text="Browse" 
                                    Width="115px" />
     </td>
        </tr>
        <tr>
            <td class="style3">
                 </td>
            <td class="style2">
                 </td>
            <td>
                 </td>
        </tr>
    </table>
    </form>