|
Perfect?? Really??
Everyone thinks their code is perfect, right up until it explodes on a machine that was not your DEV box.
I've got an app I've written going out to 10,800 machines next week. Even though I've tested it to death on a dozen machines, both XP and 7 and had a mini-pilot, I can no longer find anything wrong when the app is used normally and when I intentionally try and break it. Does that mean that my code is perfect?? Hell NO! It just means there's a test case that I haven't thought of yet.
Am I nervous that I have an app going out to so many machines? You bet your ass I am!! Especially so considering this app was comissioned by a VP and has very high visibility.
Chances are VERY good that its your code that's screwed up and there's some misguided step in your logic that you think is right and it's not, or some condition you didn't think of or are not checking for that's causing the problem.
Member 8591985 wrote: I use Stored procedure to insert data in the table.
But somehow I find
duplicate entries except for first column in the table.
AND
Member 8591985 wrote: Because I tried it myself and it wont allow to enter duplicate values as my
logic is perfect and I am inserting values on button click.
Case in point. You're obviously doing something very wrong that is never going to work in a multi-user environment. The logic works perfectly IF and only IF there is one person running your frontend. Your code is probably written for that limitation and falls on its face when used by multiple users because it doesn't take into account two people using the code at the exact same time.
You should be asking yourself (and your logic) what would happen if 2 or more users click on this button at the exact same time.
Member 8591985 wrote: How is this possible? I mean is there an error in my front end coding or is it
an error in Sql-server.
An error in SQL Server itself? Most assuredly not. Is there some problem in your stored procedure AND/OR your frontend code? I'd guarantee it!
|
|
|
|
|
Hi All,
I am creating setup project for window application in c#. I want user to enter few details during installation like username/password. Installation will be continued only if these fields are filled. Can anyone tell me how to validate fields during installation.
FYI: I am using standard Setup Project provided by .NET.
Thanks in advance !
Amit
|
|
|
|
|
|
|
Hi there
Im Fairly new to C#.net, In vb i used to use a function called SaveSetting.
Im Aware that no such function in C#.net Exists
is there any way to do this??
Ian
|
|
|
|
|
I don't know what SaveSetting does in VB.NET, but would this[^] help at all?
|
|
|
|
|
My Apologies
SaveSetting is basically a way of saving program settings to the registry so that when the program starts again those setting casn be used.
Eg a user logs in to a program for the first time so i would save their user name to the registry so that when the program starts again it assums the same user wants to logs in a gets the name from the registry and fills it in to the username textbox.
but i use it for all sorts of little bits of data that i need kept out of the way of the scope of the program
If i can't do want ive described in that way id really apreciate some advise on how to achieve the right way.
Many thanks
Ian
|
|
|
|
|
The article I linked to suggests how this can be achieved using C#.
|
|
|
|
|
Looks like SaveSetting was storing data in a file (maybe ini) or database.
You will need to implement similar functionality. Check if you are referring an external dll that contains this method's implementation.
|
|
|
|
|
If you are using C# in WinForms, you have the "Application Settings" facility to help you persist values:[^].
Other strategies, besides Registry manipulation, and Application Settings, include serialization, and deserialization.
CP has very good articles on serialization and de-serialization, just search for them: Mehdi Gholam's recent work on "Fast JSON" is outstanding: but, perhaps more relevant to situations where you need to store and retrieve large amounts of information:[^].
best, Bill
"Our life is a faint tracing on the surface of mystery, like the idle, curved tunnels of leaf miners on the surface of a leaf. We must somehow take a wider view, look at the whole landscape, really see it, and describe what's going on here. Then we can at least wail the right question into the swaddling band of darkness, or, if it comes to that, choir the proper praise." Annie Dillard
|
|
|
|
|
Thanks alot bill
im probably going to have a poke around in application settings, i always hated them in vb thats why i used the reistry, but im going to have a good research into persist values and see what i can learn
thanks again
Ian
|
|
|
|
|
Microsoft doesn't want you storing app settings in the registry anymore. Why would you anyways? The application settings API is about 1% of the work vs. storing stuff in the registry  .
|
|
|
|
|
Hi to all
i am creating an application in c# windows using socket programming..
both client and server is working well.
but main concept is when working both client and server
if no process in client program
For Example :
1). idle in gmail
2). like screen saver in windows when no process
at the time in server system shows or alert Like
" The Client Is In IDLE "
how to do this process in c# windows application.. please any body help.. ( sorry for my English )
|
|
|
|
|
|
If you are wanting to know if only your client program is idle and it is WinForms, you can use this[^].
|
|
|
|
|
If you are asking about the server....
If you have open connections and no traffic is received on them after X time (where X depends on your system) then you close the socket.
The client is responsible for detecting the socket close and re-establishing it once it starts doing something.
|
|
|
|
|
hello guys... i have this datagridview inwhich one of the columns is Checkbox column. I have this following code which works well if I put it into Button's Click Event.
<pre>
ArrayList arr = new ArrayList();
for (int i = 0; i < dgStudents.Rows.Count; i++)
{
bool val = Convert.ToBoolean(dgStudents.Rows[i].Cells[0].Value);
if (val)
arr.Add(Convert.ToInt32(dt.Rows[i]["StudentId"]));
}
</pre>
But this code does not help when I wanna check an individual row. Lets say I check/uncheck third row, then how do I know about this change? I tried <b>CellValueChanged</b> but it did not work. thnx for any help.
-- modified 2-Feb-12 4:02am.
|
|
|
|
|
overloaded Name wrote: Lets say I check/uncheck third row, then how do I know about this change? I tried <b>CellValueChanged</b> but it did not work. thnx for any help.
CellValueChanged[^] is the correct event. Can you paste/post your code here?
Bastard Programmer from Hell 
|
|
|
|
|
Here is the code for <b>CellValueChanged()</b>
<pre lang="c#">
private void dgStudents_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
if(e.ColumnIndex == 0) //checkbox column
CheckboxColumnValChanged();
}
</pre>
Now here is the code for <b>CheckboxColumnValChanged()</b>.
<pre lang="c#">
private void CheckboxColumnValChanged()
{
if (dgStudents.Rows.Count > 0)
{
//int index = dgStudents.CurrentRow.Index;
//bool IsChecked = (bool)dgStudents.Rows[index].Cells[0].Value;
//if (IsChecked)
// MessageBox.Show("True");
//else
// MessageBox.Show("False");
}
}
</pre>
When I change the third row ONLY THEN it will tell me about 2nd row. But I wanna know immediately when I check/uncheck the 2nd row.
|
|
|
|
|
The DataGridView.CellValueChanged event occurs when the user-specified value is committed, which typically occurs when focus leaves the cell.
In the case of check box cells, however, you will typically want to handle the change immediately. To commit the change when the cell is clicked, you must handle the DataGridView.CurrentCellDirtyStateChanged event. In the handler, if the current cell is a check box cell, call the DataGridView.CommitEdit method and pass in the Commit value.
Taken from here[^].
|
|
|
|
|
Thanx. It helped me
|
|
|
|
|
Do you guys know of any easy way to have one column in a table of which the value auto updates every time an UPDATE statement is called for a specific row?
Either one of the following two scenarios would be fine but I'm not sure what the easiest way would be of implementing it:
1. Let's say there's a column in the table called 'Version' (int). Every time an UPDATE statement is called, the value of the 'Version' column is automatically incremented by 1 for every row affected.
2. Let's say there's a column in the table called 'Modified' (datetime). Every time an UPDATE statement is called, the value of the 'Modified' column is automatically set to the current date and time. I have a similar concept to this in my DB with a column named 'Inserted' which has a default value of GetDate(). So for every INSERT into the table, the 'Inserted' column will automatically get the current date and time but I'd like to have something like this for UPDATE as well.
Any ideas? My best idea so far would be to create a trigger on the table, something as follows:
CREATE TRIGGER update_mytable
ON MyTable
FOR UPDATE
AS
BEGIN
UPDATE MyTable
SET Modified = GETDATE()
WHERE RecordID IN (SELECT RecordID FROM INSERTED)
END
But I'm hoping that there might be a more elegant solution.
|
|
|
|
|
This is an elegant solution, and is definitely your best bet here. Note that you should do an = test, not an IN test.
|
|
|
|
|
Thanks. But why would you say that I should use an = test as opposed to an IN test? What if the UPDATE statement affects more than one row? Is there any specific disadvantage to usign an IN test that I should consider?
|
|
|
|
|
I think that's the best approach. It should work for all updates. Second way I can think of is to create procedure for updating the table and using it for all updates, that occur. And inside this procedure you can also update your version and modified columns. But that required you to stick with the procedures for all updates.
Don't forget to rate answer, that helped you. It will allow other people find their answers faster.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
