how insert data in table

hi 

i used this thread code to upload 2 image in table with same behcode and id 

http://www.aspforums.net/Threads/530227/how-to-use-id-column/

in my page i have 2 file upload control some  Text box   button dropdown list and ...

that user complete their store information with these control and when they click on ImageButton2_Click1 and  their information insert into table

 protected void ImageButton2_Click1(object sender, ImageClickEventArgs e)
    {
        string data = Server.UrlDecode(Request.QueryString["BehCode3"]);
      
       

        string price = RadioButton2.Checked ? TextBox1.Text : "noprice";
        SqlCommand _cmd = new SqlCommand("insertproduct", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;
        _cn.Open();

        _cmd.Parameters.AddWithValue("@Name", txtname.Text);
        _cmd.Parameters.AddWithValue("@Model", txtmodel.Text);
        _cmd.Parameters.AddWithValue("@Description", CKEditorControl1.Text);
        _cmd.Parameters.AddWithValue("@Price", price);

        _cmd.Parameters.AddWithValue("@Classification", DDL1.SelectedItem.Text);
        _cmd.Parameters.AddWithValue("@subset", DDL1.SelectedItem.Text);
        _cmd.Parameters.AddWithValue("@behcode", data);
        _cmd.Parameters.AddWithValue("@id", Convert.ToInt32(ViewState["Id"]));
        _cmd.ExecuteNonQuery();

        _cn.Close();
        Response.Redirect(Request.Url.AbsoluteUri);
    }

see here i use   _cmd.Parameters.AddWithValue("@id", Convert.ToInt32(ViewState["Id"])); 

that it insert all data according to this id

i define this id in one of my button that upload users image from fileupload

 protected void BtnUpload_Click(object sender, EventArgs e)
    {



        string path = Server.MapPath(".") + "\\../image/House\\";

       


        //4-Get File Name
        string filename = System.IO.Path.GetFileName(fup1.PostedFile.FileName);

        //5-Get File Exist and if (true)Generate New Name
        while (System.IO.File.Exists(path + "\\" + filename))
            filename = "1" + filename;

        //6-Save File to Server


 

       


        fup1.PostedFile.SaveAs(path + filename);

        SqlCommand _cmd = new SqlCommand("Fileup1", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;
        string data = Server.UrlDecode(Request.QueryString["BehCode3"]);

        _cn.Open();
        _cmd.Parameters.AddWithValue("@image", filename);
        _cmd.Parameters.AddWithValue("@Behcode", data);
        _cmd.Parameters.Add("@id", SqlDbType.Int).Direction = ParameterDirection.Output;
        

        _cmd.ExecuteNonQuery();
        ViewState["Id"] = _cmd.Parameters["@id"].Value.ToString();
        _cn.Close();

so here users should select their image from this fileupload control untill their store information insert to table 

my problem is maybe users don't want upload any image when they don't  upload image it can't insert any data in table becuse of this

 ViewState["Id"] = _cmd.Parameters["@id"].Value.ToString();

so now what should i do how i can define that if users didn't upload any page it insert other infomation 

in table?

best regards