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Re: Coding Style Questions V.9-Dec-13 20:51 V. 9-Dec-13 20:51  It kinda depends I guess. For example: When you have tables where each record is considered an "object". You should use one class/table. Examples: Persons, tickets, companies, products, ... things like that. If you have tables that start having calculations or objects that are (complex) joins of tables or where multiple records can makeup one record, you should probably tackle that a little differently. hope this helps. V. (MQOTD Rules and previous Solutions ) Eye tracking code polycom1239-Dec-13 5:44 polycom123 9-Dec-13 5:44  Hello, Does anybody know of a good code that can help with an eye tracking with a webcam? I found only one code (TrackEye : Real-Time Tracking Of Human Eyes Using a Webcam) but it is from 5 years ago. Basiclly, I'm looking for something to help a disable man to comunicate. Thanks. Persists GridView Textbox Value wernlin9-Dec-13 5:22 wernlin 9-Dec-13 5:22  How to persists gridview textbox value when paging. My situation is after user entered text in textbox they will click on the button to check their answer. But after i click gridview next page the previous page textbox value is not keep. Thanks. c# listview insert not working dbushong9-Dec-13 4:11 dbushong 9-Dec-13 4:11  I am trying to insert (not add) data to a listview. The listview has 7 cols. The code I am using is: ListViewItem item = lvBOM.Items[2]; lvBOM.Items.Insert(2,"Hi"); This code is activated by a button click. The result is that a row is inserted but the word "HI" does not appear. Full row select is set to true. c# 2013 framework 4.51. Desktop app. Thank you, Duke modified 9-Dec-13 10:43am. Re: c# listview insert not working Richard MacCutchan9-Dec-13 5:37 Richard MacCutchan 9-Dec-13 5:37  I just tried that and it worked fine, is there something else that you are doing? Veni, vidi, abiit domum Re: c# listview insert not working dbushong9-Dec-13 5:51 dbushong 9-Dec-13 5:51  Thank you for replying. The app has 2 listviews. The lvBOM listview has 7 cols. I have supplied test data to all 70 rows in the first col only. Here is the code for that: for (int i = 0; i < intRCount; i++) { ListViewItem myItem = lvBOM.Items[i];//row myItem.SubItems[1].Text = "5";//col } In the same button_click I followed that code with this code: ListViewItem item = lvBOM.Items[2];//row lvBOM.Items.Insert(2,"Hi"); The result is that the row is inserted but the data does not show. This data is test and only used to test the insert function. Re: c# listview insert not working Richard MacCutchan9-Dec-13 6:13 Richard MacCutchan 9-Dec-13 6:13  I have four rows and three columns in my control. When I press the button it runs the following code: C# ListViewItem item = listView1.Items[2];//row listView1.Items.Insert(2, "Hi"); The row is added, and the word "Hi" appears in column 1. I can only assume that there is something in your code that you have not shown us, which is causing a problem. Veni, vidi, abiit domum Re: c# listview insert not working dbushong9-Dec-13 7:18 dbushong 9-Dec-13 7:18  Thank you for hanging in there with me.. I just started a new project. In the form load I have the following. I still cannot get it to work. private void Form1_Load(object sender, EventArgs e) { lvBOM.Clear(); lvBOM.Width = 451; lvBOM.Columns.Add("", 0, HorizontalAlignment.Center);//skip first col lvBOM.Columns.Add("Level", 40, HorizontalAlignment.Center); //level 1 is base lvBOM.Columns.Add("Part Number", 100, HorizontalAlignment.Center); lvBOM.Columns.Add("Description", 250, HorizontalAlignment.Center); lvBOM.Columns.Add("Qty", 40, HorizontalAlignment.Center); lvBOM.Columns.Add("", 0, HorizontalAlignment.Center);//InventoryMstrGUID lvBOM.Columns.Add("", 0, HorizontalAlignment.Center); //InventoryMstrGUIDMAIN lvBOM.FullRowSelect = true; lvBOM.View = View.Details; for (int i = 1; i <= 70; i++)//'initialize rows so grid looks like a grid { var lvi = new ListViewItem("");//will add to column(0) not being used lvi.SubItems.Add(""); lvi.SubItems.Add(""); lvi.SubItems.Add(""); lvi.SubItems.Add(""); lvi.SubItems.Add(""); lvi.SubItems.Add(""); lvBOM.Items.Add(lvi); } ListViewItem item = lvBOM.Items[2];//row lvBOM.Items.Insert(2, "Hi"); } Re: c# listview insert not working Richard MacCutchan9-Dec-13 7:34 Richard MacCutchan 9-Dec-13 7:34  When you add the new item the text is placed in the first column. But you have chosen to hide that column, so the text never shows. Change the width of that column to something larger than 0 and it will work. Veni, vidi, abiit domum Re: c# listview insert not working dbushong9-Dec-13 7:43 dbushong 9-Dec-13 7:43  Thank you so much. But I apparently am having a fundamental problem. ListViewItem item = lvBOM.Items[2];//<<<< this line inserts the row lvBOM.Items.Insert(2, "Hi");//<<< I thought this line would select the 3rd col since the index is 2. Column 0 is hidden = 0 index column 1 is visible = 1 index column 2 is visible = 2 index I thought the "HI" would go into the 3rd column which has an index of 2. What am I missing? How do I do this? Re: c# listview insert not working Richard MacCutchan9-Dec-13 7:47 Richard MacCutchan 9-Dec-13 7:47  No, you are adding an Item into the second position of the view. You need to set the string into the second subitem position of the item that you add. Veni, vidi, abiit domum Re: c# listview insert not working dbushong9-Dec-13 8:03 dbushong 9-Dec-13 8:03  I am rather new at listviews so please excuse my ignorance. I searched for hours on the net before signing up for this forum. I do not understand why this >> lvBOM.Items.Insert(2, "Hi"); won't work. What is the '2' if not to place data in the 3rd col? Can you give sample code? Re: c# listview insert not working dbushong9-Dec-13 8:41 dbushong 9-Dec-13 8:41  I finally got it. Thank you very much. Re: c# listview insert not working Richard MacCutchan9-Dec-13 8:59 Richard MacCutchan 9-Dec-13 8:59  dbushong wrote: I am rather new Nothing wrong with that, we all had to learn at one time. Make good use of the reference pages on MSDN, like the ListView pages[^]. Veni, vidi, abiit domum C# XML or Database Member 104453489-Dec-13 2:57 Member 10445348 9-Dec-13 2:57  I'm looking at trying to make a app. that keeps track of camp-sites for a season. I was wondering if I should go with a full blown database (which I assume cost money) or maybe go with a XML file. If I went XML I was wondering what would be the best way to do it. All the information in one xml file. Or maybe one xml for each month of the season and keep track that way. Any input would be great, thanks for taking the time to help a noobie out. Stevish Re: C# XML or Database Richard MacCutchan9-Dec-13 3:34 Richard MacCutchan 9-Dec-13 3:34  Microsoft offers SQL Server Express[^] or SQL Compact Edition[^], both free. It does depend somewhat on your total requirements. Veni, vidi, abiit domum Re: C# XML or Database Member 104453489-Dec-13 9:22 Member 10445348 9-Dec-13 9:22  Not much for requirements, it's just a simple booking system I guess. I really new to C# are programming as a whole, did some PHP a while back. I just wanted to make something that could be useful while I am learning. Thanks for the info! Stephen Re: C# XML or Database thatraja9-Dec-13 3:54 thatraja 9-Dec-13 3:54  Addition to Richard's suggestions, you could choose one more instead of XML. Sqlite[^] Don't go with XML. There're many advantages(Editor-GUI, Security, Performance, etc.,) if you go with Database. Just FYI(XML vs Databases), check these XML vs. SQL database: which is the right one for you?[^] When to use XML Instead of a Relational Database[^] thatraja Code converters | Education Needed No thanks, I am all stocked up. - Luc Pattyn When you're wrestling a gorilla, you don't stop when you're tired, you stop when the gorilla is - Henry Minute Re: C# XML or Database Nicholas Marty9-Dec-13 4:15 Nicholas Marty 9-Dec-13 4:15  I also used XML for storing some data in some cases. An advantage: You can manually tell the application which file you want to load (or store to) and keep multiple different versions at the same time without causing any problems. If you're using a database this is getting a bit more difficult. Also if you want to store them in a e.g a Source Control as most Databases store the data in some binary format. You can however easily compare different XML files with each other. Besides. Database might generally offer better performance but they can also require quite a lot of resources to run. If you don't have lots of data an XML file might still be faster than a database. Re: C# XML or Database Member 104453489-Dec-13 9:22 Member 10445348 9-Dec-13 9:22  Thanks for your suggestion, I will read up on Sqlite Thanks again! Stephen Re: C# XML or Database harold aptroot9-Dec-13 6:30 harold aptroot 9-Dec-13 6:30  The data doesn't sound particularly tree-like (could have been an excuse to use XML) It sounds like a bunch of records - like a database. If you find that too heavy-weight, you could use a simple comma-separated text file, or maybe just serialize your array of records to a binary file. Re: C# XML or Database Member 104453489-Dec-13 9:24 Member 10445348 9-Dec-13 9:24  Ya your got me, I was looking for an excuse to fool around with XML. I'll will likely go with one of the DB options above and start learning about that. Thanks again all for the great info! very helpful site Stephen Re: C# XML or Database Dave Kreskowiak9-Dec-13 10:10 Dave Kreskowiak 9-Dec-13 10:10  You're kid of comparing apples to oranges. XML is not a database. You can use it for simple tables and such but it has no query engine. Go with a true database engine and you'll be much better off. A guide to posting questions on CodeProject[^] Dave Kreskowiak Re: C# XML or Database Member 1044534810-Dec-13 1:41 Member 10445348 10-Dec-13 1:41  Ya working on setting one of those free ones up now. If I went with the XML root I would of used linq to xml. Again thanks all for the help! Steve Re: C# XML or Database Dave Kreskowiak10-Dec-13 2:36 Dave Kreskowiak 10-Dec-13 2:36  Member 10445348 wrote: If I went with the XML root I would of used linq to xml. That's not exactly what I would call "performant". There is no indexing with XML or LinqToXML. Searches only work by iterating over the entire set of rows in a field. No thanks. I'll stick with a database engine. On top of that, XML doesn't scale with the number of users. Add more than a small handful of users using the system simultaneously and you'll be begging for a database engine. A guide to posting questions on CodeProject[^] Dave Kreskowiak

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