how to use id column

hi 

i use this code to uploading image

<asp:UpdatePanel ID="Upbdt1" runat="server">
  
 <ContentTemplate>
 <asp:ModalPopupExtender DropShadow="true" ID="ModalPopupExtender1" 
         PopupControlID="PnPopup1" runat="server" TargetControlID="BtnPopup1"
          >
 </asp:ModalPopupExtender>
 <asp:Button ID="BtnPopup1" OnClick="BtnPopup_Click" runat="server" Text="select image" CssClass="DPC9_Img1" BorderStyle="Solid" BorderWidth="0px" BorderColor="White" />
 <asp:Panel ID="PnPopup1" runat="server" BackColor="White" 
         CssClass="panel">
     <asp:ImageButton ID="ImageButton3" runat="server" ImageUrl="~/image/close.png" />
<br />
     <asp:FileUpload ID="fup1" runat="server"
         ToolTip="click" />
 
  <asp:Button ID="BtnUpload1" OnClick="BtnUpload_Click"  runat="server" Text="load" />
 </asp:Panel>
 </ContentTemplate>   
 <Triggers>
 <asp:PostBackTrigger ControlID="BtnUpload1" />
  
 </Triggers>
  
 </asp:UpdatePanel>

and

protected void BtnUpload1_Click(object sender, EventArgs e)
  {
 
      string path = Server.MapPath(".") + "\\../image/House\\";
 
      string[] validext = { ".jpg", ".gif", ".png", ".rar" };
      string ext =
          System.IO.Path.GetExtension(AsyncFileUpload1.PostedFile.FileName);
      if (Array.IndexOf(validext, ext.ToLower()) < 0)
      {
          lblMessage.Text = "please enter correct format";
          return;
      }
 
 
      string filename = System.IO.Path.GetFileName(fup1.PostedFile.FileName);
 
 
      while (System.IO.File.Exists(path + "\\" + filename))
          filename = "1" + filename;
 
      
 
 
      if (fup1.HasFile)
      {
          try
          {
    
              if (fup1.PostedFile.ContentLength < 105000)
              {
               
                  fup1.PostedFile.SaveAs(Server.MapPath("~/Upload") + System.IO.Path.DirectorySeparatorChar + AsyncFileUpload1.PostedFile.FileName);
 
                   
                  Label20.Text = "File " + fup1.PostedFile.FileName + " uploaded successfully.";
              }
              else
              {
                   
                  Label20.Text = "File size of " + Convert.ToString(fup1.PostedFile.ContentLength / 1024) + " KB is exceeding the uploading limit.";
              }
          }
          catch (Exception ex)
          {
              // error message
              Label20.Text = "Some problem occurred while uploading the file. Please try after some time.";
          }
      }
      else
      {
          // warning message
          Label20.Text = "Please choose a file to upload.";
      }
 
      fup1.PostedFile.SaveAs(path + filename);
 
      SqlCommand _cmd = new SqlCommand("Fileup4", _cn);
      _cmd.CommandType = CommandType.StoredProcedure;
      string data = Server.UrlDecode(Request.QueryString["BehCode3"]);
 
      _cn.Open();
      _cmd.Parameters.AddWithValue("@image2", fup1.FileBytes);
      _cmd.Parameters.AddWithValue("@Behcode", data);
 
      _cmd.ExecuteNonQuery();
      _cn.Close();
 
 
 
  }

Store Procedure

create procedure dbo.Fileup4


@image2 varbinary(MAX),
@behcode varchar(10)
@id int
as
begin
update image set image2=@image2
where behcode=@behcode  and id=@id
end

i want it update table according to behtop and id column  for @behtop i use these code

string data = Server.UrlDecode(Request.QueryString["BehCode3"]);

 _cmd.Parameters.AddWithValue("@Behcode", data);

but i don't know what should i write fo @ID?

Best  regards