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I am writing an HR application to add new employees. Currently, I am having an issue where I want to send a specific message base on the exception that is received. In my database SNN is a unique key hence if an SSN is being added that already exist in the DB a Unique key violation exception is thrown. If the UserID already exist a Primary Key violation exception is thrown. I am certain this is possible but just not sure what is best practice. I can write a method which search the DB first and if the record is found thrown an error message based on whether it was the Unique key violation or the PK violation. I have also been searching MSDN to see if I can identify the C# SqlClient error ID for either scenarios and based on the exception ID, alert the user with the right error message.
Any advice will be greatly appreciated.
Skan
If you knew it would not compile why didn't you tell me?!?!?!
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Skanless wrote: I have also been searching MSDN to see if I can identify the C# SqlClient error ID for either scenarios and based on the exception ID, alert the user with the right error message
All the Ids can be found in SQL Server itself.
SELECT * FROM sys.messages or
SELECT * FROM sysmessages (if you are on SQL Server 2000)
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Thanks dude, I found them. I would still like to know what best practice for a situation like this.
Skan
If you knew it would not compile why didn't you tell me?!?!?!
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Use IF Exists in a trigger and then throw custom exceptions from the sp. However, SQL server will natively through the message number so there is no reason for custom handling to catch it.
Need a C# Consultant? I'm available.
Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
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This worked perfectly!!!
IF EXISTS
(SELECT Emp_Login_ID FROM Employees where Emp_Login_ID = @Emp_Login_ID )
RETURN -1
ELSE
IF EXISTS
(SELECT Emp_SSN FROM Employees where Emp_SSN = @Emp_SSN )
RETURN -2
ELSE
INSERT INTO........
I am no longer receiving the Exception. However, I am not sure how to throw the Error message in C#. How would C# know to throw and Exception if the insert does nto execute? Thanks for you help.
Note: All this is done in a single stored procedure. Which is then called in the application in a try, catch statement.
Skan
If you knew it would not compile why didn't you tell me?!?!?!
modified on Thursday, December 06, 2007 12:44:52 AM
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Thanks for the help guys. I got it working with the following lines of code. I will simplify my code later but just need to get it working.
SqlParameter paramReturnValue = new SqlParameter();
paramReturnValue.ParameterName = "@return_value";
paramReturnValue.SqlDbType = SqlDbType.Int;
paramReturnValue.Direction = ParameterDirection.ReturnValue;
cmd.Parameters.Add(paramReturnValue);
Skan
If you knew it would not compile why didn't you tell me?!?!?!
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A System.Data.SqlClient.SqlException has an Errors array which contains the specific error(s).
I search it for 2601 (unique index violation) or 2627 (primary key violation), and if present I wrap it in a custom exception.
You can take a look at my DatabaseAccessor article which contains an enum of the code I support.
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Hello everybody scenario is as follows:
Application multithreaded in windowsForms
C# Language
Framework 2.0 in VisualStudio 2005
This application works with several business logic processes asynchronous manner.
Play audio and video with DirectX
Handles timers who control the times of execution.
Everything works correctly while not use objects pictureBox with animated images (GIF). When I need to load an Animated Gif in a pictureBox and view the animation at run time, the processor is fired at a 100%, that happens only with a lively Gif image. Using a JPG or PNG static images, the performance is not affected. But implementation requires at least play 10 Gif animated, distributed in the Form.
When you try to load all these images, many are not displayed in the pictureBox and those displayed lose animation or reproduce them too slowly and with a delay that makes Losing the aesthetics chart.
To accomplish this I found some documentation msdn Class ImageAnimator, which to deploy in a component created for myself, I get the same problem of performance that picture box.
If anyone has an idea of what's going on and how to solve am waiting for their early comments.
Thankyou.
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I'd avoid the picture box and draw the images yourself. The picture box doesn't handle animated gifs, so you must have your own code in there somewhere already, right ?
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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i am trying to export a excel file to the user when they click a button, i tried Response.WriteFile("filename"), it only display the content in the same page, can someone tell me whats the code to prompt them with a save as option? Thank you in advance.
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I think I just answered this in the VB forum. The ASP.NET forum is the only forum that is right for this question, please don't crosspost
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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sorry for the crosspost, i was a bit impatient, and thank you for your help, Regards!
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Hi
I have the code below to minimize my form to the systemtray and bring it back up when the notifyicon is doubleclicked.
When the form is minimized some log-information is added in a richtextbox and I want the errors to be shown in red, so I set the selectioncolor to red.
My problem is that this only works if the form is in it's normal state otherwise all the text added will be black.
Does anyone know why I can't set the selectioncolor when the form is minimized?
private delegate void UpdateInfoDelegate(string newEvent, Color c);
private void UpdateInfo(string newEvent, Color c)
{
rtbInfo.SelectionColor = c;
rtbInfo.AppendText(newEvent);
rtbInfo.SelectionColor = Color.Black;
}
public void SetInfoText(string text)
{
rtbInfo.Invoke(new UpdateInfoDelegate(UpdateInfo), DateTime.Now + " " + text + "\r\n", Color.Black);
}
public void SetErrorText(string text)
{
rtbInfo.Invoke(new UpdateInfoDelegate(UpdateInfo), DateTime.Now + " " + text + "\r\n", Color.Red);
}
private void Form1_Resize(object sender, EventArgs e)
{
if (WindowState == FormWindowState.Minimized)
{
Hide();
notifyIcon1.Visible = true;
}
}
private void notifyIcon1_DoubleClick(object sender, EventArgs e)
{
Show();
WindowState = FormWindowState.Normal;
notifyIcon1.Visible = false;
}
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You have to do the append/coloring in this order: append, select appended text, set selection color. See this post on MSDN[^].
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I have a dataset filled with names (1 table 1 collumn),
I then loop trough the dataset and add all of them as tree nodes to a treeview.
Then i want to aply a rowfilter after the rowfilter is set i want to loop trough the filtered set,
But evertime i do it nothing gets filtered it just displays everthing in the dataset.
I'm guessing that its my loop but im not sure:
for(int i=0; i < dataset_filter.Tables[0].Rows.Count; i++)
Rowfilter:
dataset_filter.Tables[0].DefaultView.RowFilter = "filter='" + filter.Text + "%'";
Thanks!
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Hello,
I am executing a JScript class from my C# using Microsoft Jscript Engine, using reflection to invoke JScript.
If there is any exception thrown from JSCript, how to frame it properly for end user. I can handle the execption in try catch block, but i am getting TargetInvocation exception, which needs to be framed properly and shown to end user. Any Inputs in framing the TargetInvocation exception and showing to user in meaningful way?
Thanks
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Hello,
I have a DataGridView that is dynamically populated and configured for row select, multiselect = no. When a row is double clicked, an event handler is fired which runs a function based on the Row index. The row index is referenced as follows:
myDgv.SelectedRows[0].Cells[2].Value.ToString()
This works great, until the user is holding the CTRL key while double clicking. I get an "index out of range error", making me think holding the CTRL key changes the value the above code returns.
Has anyone ran into this before? I'm not sure what to do, other than catch the error and fail the event. Any ideas are appreciated!
Thanks,
Alan
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I think it may have something to do with the index being cell based rather than row based if I hold CTRL. CTRL modifies selection in Windows (as in selecting multiple files at once, or multiple listbox lines at once).
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Ok, figured it out. When I doubleclick on a row while holding CTRL, the dialog selects the row on the first click, but deselects it on the second. The DoubleClick eventhandler fires, references the selected row, and fails as none are selected.
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Hello everyone,
I know this one is a little tricky, but I hope someone has a
hint or an idea.
In our application occurs a StackOverflowException (at least
I think that) and the result is, that the application just
closes.
The problem is that I am not really sure which Exception
occurs because it happens sporadically and only at one of our
customers in different parts of our application.
So I have checked our code what will happens, when I manually
force some unhandled exceptions to occur. For example
NullReference, DivisionByZero, OutOfMemeory. No problem at
all. They all where handled by the Application.ThreadException
event. With a call stack and everything else that is nice to
have.
Then I tried StackOverflowException. The application crashes
and closes with a Dr. Watson hint. No stack trace and no clue
where to start searching.
Does anyone know how to log the call stack of an
StackOverflowException? (Of course without to install Visual
Studio on the customers workstations)
The application is developed in c# @ .Net Framework 2.0
Many thanks for every tip in advance...
modified on Thursday, December 06, 2007 4:55:21 AM
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According to http://msdn2.microsoft.com/en-us/library/system.stackoverflowexception.aspx[^]...
<br />
In prior versions of the .NET Framework, your application could catch a StackOverflowException object (for example, to recover from unbounded recursion). However, that practice is currently discouraged because significant additional code is required to reliably catch a stack overflow exception and continue program execution.<br />
<br />
Starting with the .NET Framework version 2.0, a StackOverflowException object cannot be caught by a try-catch block and the corresponding process is terminated by default.<br />
Does that help?
Please don't bother me... I'm hacking right now. Don't look at me like that - doesn't anybody remember what "hacking" really means? 
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Thank you, I have also read that and that gave me no hope. So the best is to switch back to Framework 1.0 
I cannot believe there is no way to catch such a fatal exception.
I have tried to create a new AppDomain…
I have tried to start the whole app in a separate Thread…
But everything I do the application still crashes. 
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I am using Treeview in a C# windows form. The data entered into the tree is a hierarchical listing of table definitions associated in groups of various depth off of the Treeview root.
I am looking for a class or routine where I can navigate through each Treeview node and node/child, get the value of the element so i can process the output.
I have a rudimental listing of this through the first 2 nodes (with testing ), but this requires some more elaborate coding, maybe recursive:
<br />
String nodeName = "";<br />
int nodeNum = 0;<br />
int i = 0, j = 1, k=0, cnt=0, lstNode=0;<br />
nodeName = treeView1.ToString();<br />
if (treeView1.Nodes.Count > 0)<br />
{<br />
for (i = 0; i < treeView1.Nodes.Count; i++)<br />
{<br />
nodeName = treeView1.Nodes[i].Text.ToString();<br />
cnt = treeView1.Nodes[i].GetNodeCount(false);<br />
if (cnt > 0)<br />
{<br />
lstNode = treeView1.Nodes[i].LastNode.Index;<br />
lstNode = treeView1.Nodes[i].LastNode.Level;<br />
for (j = 0; j < cnt; j++)<br />
{<br />
try<br />
{<br />
nodeName = treeView1.Nodes[i].Nodes[j].Text.ToString();<br />
}<br />
catch (Exception e)<br />
{ <br />
nodeName = "Undefined"; <br />
}<br />
}<br />
}<br />
}<br />
}<br />
This needs to be refined so that I can see ALL child elements no matter how deep they are in the Treeview.
Can anyone help?
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You will need to write a recursive function to iterate through all nodes of a treeview
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That is my assumption as well, but I have not written a recursive function in quite awhile. Can anyone give me push in the right direction on this? Code samples or what not?
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