数据表不会更新

Question

I wanted to update my database that contains two text and one filename that is needed for image.

The problem is that the image and filename updates but the two other text values title and body wont be affected and don't change the previous values. Also visual studio don't get any problem and the message for executing command shows that it's executed the command but nothing except the image changes.

    protected void Page_Load(object sender, EventArgs e)
    {


        if (Session["user"] == null)
            Response.Redirect("~/default.aspx");

        if (Request .QueryString ["action"]=="edit")
        {
            Panel1.Visible = true;
        }

        if (Request.QueryString["edit"] != null)
        {


            Panel1.Visible = true;
            SqlConnection con2 = new SqlConnection();
            con2.ConnectionString =GNews.Properties.Settings.Default.connectionstring;
            DataTable dt3 = new DataTable();
            con2.Open();
            SqlDataReader myReader = null;
            SqlCommand myCommand = new SqlCommand("select * from loadpost_view where Postid=" + Request.QueryString["edit"].ToString () + "", con2);
            myReader = myCommand.ExecuteReader();



            while (myReader.Read())
            {
                title_txt.Text=myReader ["Title"].ToString ();
                bodytxt.Text = myReader["Body"].ToString();
            }
            con2.Close();
        }
protected void btn_addpost_Click(object sender, EventArgs e)
    {
string title= title_txt .Text ;
string body=bodytxt .Text ;

if (Request.QueryString["edit"] != null)
{
    string message;

    string filename = thumb_uploader.FileName;
    string path = HttpContext.Current.Server.MapPath("~") + "\\Thumb";
    string exup = System.IO.Path.GetExtension(thumb_uploader.FileName);
    string[] ext = { ".jpg", ".png", ".jpeg" };
    if (Array.IndexOf(ext, exup) < 0)
    {
        message = "not correct.";
    }

    if (thumb_uploader.FileBytes.Length / 1024 > 400)
    {
        message = "not currect.";
    }

    while (System.IO.File.Exists(path + "\\" + filename + exup))
    {
        filename += "1";
    }

    savepath = path + "\\" + filename;

    if (thumb_uploader.HasFile)
    {
        thumb_uploader.SaveAs(savepath);

        thumb = thumb_uploader.FileName;
        SqlCommand command;
        SqlDataAdapter da;
        SqlConnection con3 = new SqlConnection();

        con3.ConnectionString = GNews.Properties.Settings.Default.connectionstring;
        command = new SqlCommand();
        command.Connection = con3;
        da = new SqlDataAdapter();
        da.SelectCommand = command;

        command.CommandText = "UPDATE tbl_post SET Title=@title ,Body=@body ,Thumb=@thu Where Postid=" + Request.QueryString["edit"].ToString();
        con3.Open();
        command.Parameters.AddWithValue("@title", title );
        command.Parameters.AddWithValue("@body", body );
        command.Parameters.AddWithValue("@thu", thumb_uploader .FileName);

        command.ExecuteNonQuery();
        con3.Close();
        message = "its ok.";
        lbl_result.Text = message;
   }
   else
   {
        using (SqlConnection con3 = new SqlConnection(GNews.Properties.Settings.Default.connectionstring))
        {
            string sql = "update tbl_post SET Title=@title ,Body=@body  Where Postid=@postid" ;
            using (SqlCommand command = new SqlCommand(sql, con3))
            {
                con3.Open();

                command.Parameters.AddWithValue("@title", title);
                command.Parameters.AddWithValue("@body", body);
                command.Parameters.AddWithValue("@postid",  Request.QueryString["edit"].ToString());

                command.ExecuteNonQuery();
                con3.Close();
                message = "its ok.";
                lbl_result.Text = message;
            }
        }
   }
}

Answer 1

I've found the answer I needed this code to include my pageload reading database so it wouldn't do it when I click on the update button.I mean the problem was all about the post back thing.

 if (!Page.IsPostBack)
        {
            if (Request.QueryString["edit"] != null)
            {


                Panel1.Visible = true;
                SqlConnection con2 = new SqlConnection();
                con2.ConnectionString = GNews.Properties.Settings.Default.connectionstring;
                DataTable dt3 = new DataTable();
                con2.Open();
                SqlDataReader myReader = null;
                SqlCommand myCommand = new SqlCommand("select * from loadpost_view where Postid=" + Request.QueryString["edit"].ToString() + "", con2);
                myReader = myCommand.ExecuteReader();



                while (myReader.Read())
                {
                    title_txt.Text = myReader["Title"].ToString();
                    bodytxt.Text = myReader["Body"].ToString();
                }
                con2.Close();
            }
        }