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For this kind of code sample, I wish I had more than one up-vote 
thanks, Bill
«To kill an error's as good a service, sometimes better than, establishing new truth or fact.» Charles Darwin in "Prospero's Precepts"
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Thanks
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Well thanks again Eddy, it's done the job brilliantly with only a few minor tweaks to allow for use in my situation!
Awesome 
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You're welcome, and thanks
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You might also want to take a look as SQL Servers HierarchyID[^] structure, I use a string format of that for my NodeKey whenever I have to maintain a tree structure.
Never underestimate the power of human stupidity
RAH
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how to do cut copy paste in treeview... and the changes should simultaneously update in xmldocument?
here the treeview has already been populated with xml file
Sandeep Puvvadi
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I use C # to insert records into SQL Server 2005 after inserted me into the table to delete records but not receive an error message, you see the image attached, you do know what software debugging SQL Server on http://s17.postimg.org/6wjwqdzcf/error_data.jpg
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Start by showing us the query you used, and the code fragment that used it.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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In other projects I use mongodb gridfs, but there is no driver for windows phone 8.1. I haven't find any database with file store, linq for documents and embedded use availability.
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I don't know if Mehdi Gholam's Raptor Document Store is usable on Win 8.1 phone, but it has been in development here since 2012, and Mehdi is actively supporting it. Worth a look, and, perhaps, a question: [^].
«To kill an error's as good a service, sometimes better than, establishing new truth or fact.» Charles Darwin in "Prospero's Precepts"
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hi, I cant seem to read what's in a file I have created and written text in.
Please help 
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Of course that's not normal. But you provided no details, so we have nothing "to work with" and there is no "common cause" for that. If you edit your post and include the relevant parts of your code we might be able to help.
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ReadFromFile
{
class Program
{
static void Main(string[] args)
{
FileStream fs;
StreamWriter fw;
<pre>
fs = new FileStream("D:\\Programming.txt", FileMode.OpenOrCreate, FileAccess.Write);
fw = new StreamWriter(fs);
fw.WriteLine("C# Programming");
fw.WriteLine("C Programming");
fw.WriteLine("C++ Programming");
fs.Close();
}
}
}
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Do you get an exception? What does it say?
The difficult we do right away...
...the impossible takes slightly longer.
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OK - the first thing to do is run your code and see what happens.
Have a look at the file, and see what it contains - use Windows Explorer to check teh file is there, then double click it to use Notepad to look at the content.
What's in there?
Nothing - the file is empty, which mean you can't read the data back at all!
Why? Well, lets look at your code. The first thing I notice is that you close the Stream, without closing the StreamWriter - so if the Writer doesn't "flush" it's content to the Stream before the Stream closes, it never can.
So try closing the StreamWriter before you close the Stream - that should flush the data to the stream:
FileStream fs;
StreamWriter fw;
fs = new FileStream("D:\\Temp\\Programming.txt", FileMode.OpenOrCreate, FileAccess.Write);
fw = new StreamWriter(fs);
fw.WriteLine("C# Programming");
fw.WriteLine("C Programming");
fw.WriteLine("C++ Programming");
fw.Close();
fs.Close();
(Also notice that I changed where I wrote the file: partly because it's "untidy" to leave files in the root folder - you don't know if they are important in a couple of weeks time - and partly because it's a bad idea to use the root directory of any disk directly. It's often restricted to prevent viruses spreading too easily)
A better way to code your write is to use using blocks:
using (FileStream fs = new FileStream("D:\\Temp\\Programming.txt", FileMode.OpenOrCreate, FileAccess.Write))
{
using (StreamWriter fw = new StreamWriter(fs))
{
fw.WriteLine("C# Programming");
fw.WriteLine("C Programming");
fw.WriteLine("C++ Programming");
}
}
This shows the structure better, and also closes the Stream and StreamWriteer for you, as well as removing them from context so they can;t be used by accident when they aren't ready.
When you have the file written properly, it's pretty easy to read it!
Have a go, and if you are still having troubles, let me know!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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You should close the StreamWriter as well I think.
If you're unsure of the code you could always set a breakpoint and debug or add a try catch statement.
Usually the D drive is not "protected" as someone mentioned, although you never know. Do make sure it exists and that it is not the CD/DVD-ROM drive or something like that.
Hope this helps.
modified 13-Apr-15 4:25am.
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hi everyone,
i have a web service that need authentication so i used soap header authentication along with creating a token , i used this line of code to create it
public string token = Guid.NewGuid().ToString();
but my boss told that's simply .NET guid & did't accept it
so i was asking is there another of creating a token
a token like that
e710581a-f985-40a7-a8e7-808c26177c0f
plz i need this quickly
thnkx 
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Did your boss say that .NET guids are not real guids? If so he doesn't know what he's talking about.
The difficult we do right away...
...the impossible takes slightly longer.
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i don't what the refuse for actually & unfortunately he is not here , he's outside the country so if there another way for creating a token that used in web service authentication , plz tell me i needed it very soon
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This project I'm working on c# Win App, the customer built a DAL, which compiles into a DLL.
Then used straight Entity Framework 6.+ to bind against.
I read this article, that says you need to use the Entity Data Model to code and bind against.
Entity Framework in WinForms[^]
So I followed the instructions, and now I have a datagrid that I can load data in, and it works.
I figured out how to sort it using OrderBy
Question:
Is this the way to go?
Comment:
I'm old school here, where you hand type what you want to do.
I'm not use to the binding, and Entity Framework is new to me.
I can see how handy this can be if I can figure it out, and implement it correctly.
I would lime to get more control over my select statement here, or am I overlooking the design of EF altogether.
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
_context = new entity_data_model.StoreDatabaseEntities();
_context.Customers.Load();
_context.SalesOrderDetails.Load();
this.customerBindingSource.DataSource = _context.Customers.Local.ToBindingList().OrderBy(customer => customer.FirstName);
this.salesOrderDetailBindingSource.DataSource = _context.SalesOrderDetails.Local.ToBindingList();
Debug.WriteLine("Supports Filtering: " + customerBindingSource.SupportsFiltering);
Debug.WriteLine("Supports Filtering: " + salesOrderDetailBindingSource.SupportsFiltering);
customerDataGridView.AutoGenerateColumns = false;
}
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Is this to way to go ... where? What is it you want the code to do? The only reasonable fitness of this code is as an example of ... a badly laid out example of binding to a table of small size. It's most definitely not production quality code as its not scalable at all.
The first thing it does is load ALL of the Customers and ALL of the SalesOrderDetails tables. If the tables are quite large this will result is very slow query performance as EF re-hydrates every object in those tables, even if those objects are not needed by the query.
The code is binding to the ENTIRE list of Customers, not just the customers that are visible in the datagrid. Again, this does not scale as the list of Customers grows and grows. This setup does not support filtering nor does it allow for paging.
It also appears that the grid used for SalesOrderDetails is showing the entire list of orders details, not just the details for a selected Customer. What good is that?
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Good point you made there about loading the entire list of customers and sales orders. I forgot about that.
I'll look for a way to use Entity Framework without binding. So I guess the answer is no.
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No Entity Data Model
And just use the Data Access Layer that is compiled as a DLL
So I replaced the GridView with a ListView, wrote code to create the columns, and wrote this code to load the ListView object.
I really don't want to bind to objects. I want to use the benefits of the Data Access Layer concept, but without binding.
All the examples and turtorials I'm able to locate show Entity Framework and binding to objects.
So I got rid of the Entity Data Model and DataSources, and went back to the DAL only.
I'm not clear on the Entity Framework. Wasn't even sure if I was really using it or not, so I deleted the reference to it.
Got a few error messages in teh code I posted below, so I guess I'm using it.
This is a crash course for me on using DAL and Entity Framework, so please bear with me, I am underwater on this subject.
private void load_customers()
{
lv_customers.Items.Clear();
using (StoreContext context = new StoreContext())
{
var query =
from customer in context.Customers
where customer.FirstName == "Randy" || customer.LastName == "Sublett"
orderby customer.FirstName
select new
{
ID = customer.ID,
FirstName = customer.FirstName,
LastName = customer.LastName,
BusinessName = customer.BusinessName
};
foreach(var ci in query)
{
ListViewItem item = new ListViewItem(ci.ID.ToString(), 0);
item.SubItems.Add(ci.FirstName);
item.SubItems.Add(ci.LastName);
item.SubItems.Add(ci.BusinessName);
item.SubItems.Add(0.ToString());
lv_customers.Items.Add(item);
Application.DoEvents();
}
}
}
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