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I installed Microsoft SQL Server Compact 4.0 but i get same error everytime i launch my application.
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Take a look at the version that your application is expecting - the exception mentioned 3.5 
Bastard Programmer from Hell 
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how stupid =))) later version should be more than enough, but, hey, that's microsoft, nothing ever works as it should =)))
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Ah, yes, because all later versions are "automatically" completely compatible, right? 
Bastard Programmer from Hell
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installed 3.5 version and now it works =))
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Saidrex wrote: later version should be more than enough,
It is a major version change 3 => 4. So quite reasonable and expected that they shouldn't be mixed.
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I have dataGridview table, when i click on specific cell in specific column, it searches text from that cell in other database tables and returns single rows. How to delete found rows from those tables?
I got this far:
private void datoru_sarakstsDataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)
if (e.ColumnIndex == 7)
{
string a = datoru_sarakstsDataGridView.Rows[e.RowIndex].Cells[1].Value.ToString();
DataRow[] sarakstsRow = datori_database.Tables["datoru_saraksts"].Select("datora_id = '" + a + "'");
sarakstsRow[0].Delete();
DataRow[] konfigRow = datori_database.Tables["konfig"].Select("datora_id = '" + a + "'");
konfigRow[0].Delete();
DataRow[] osRow = datori_database.Tables["operetajsistemas"].Select("datora_id = '" + a + "'");
osRow[0].Delete();
DataRow[] progRow = datori_database.Tables["programmas"].Select("datora_id = '" + a + "'");
progRow[0].Delete();
But when i execute my program and try it, it doesn't delete those rows.
Sorry for my bad english.
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Delete marks the row for deletion by updating the status to Delete.
You still need to call AcceptChanges to delete these rows.
You can read more about the Delete method here[^].
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nope, nothing there helped me.
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Do you want to delete the rows from the datatable or from the database or both?
Never underestimate the power of human stupidity
RAH
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I tried delete rows only from 1 table and it worked, but when i try code posted in first post i get and error: IndexOutofRangeException was unhandled
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Tried another way to delete rows:
string a = datoru_sarakstsDataGridView.Rows[e.RowIndex].Cells[1].Value.ToString();
DataRow[] osRow = datori_database.Tables["operetajsistemas"].Select("datora_id = '" + a + "'");
int index = datori_database.operetajsistemas.Rows.IndexOf(osRow[0]);
datori_database.Tables["operetajsistemas"].Rows[index].Delete();
datori_database.operetajsistemas.AcceptChanges();
And again nothing happens.
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Sir my humble request is if u could please help me with Http Handlers implementation using C#.
Sir i have a textbox in which i retrieve name of employee from database on button click , now i want to implement a handler between .
I am not able to understand what code i should write inside the ProcessRequest method of the handler, and how to register handler in IIS.
In-case u have some documentation or code which could help me understand these things better,I request u sir please mail me, my email id is Jyant_money@yahoo.com.
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You are asking your questions in the wrong way, mixing up UI elements with HttpHandler logic.
It usually works like this: UI generates an event, in response to which the page issues a request with specific URL that's sent to your HttpHandler, which then writes the response back.
You can find a few article on this forum about use of HttpHandler, I will only add to the list the one that I published: Basic Routing for HttpHandler[^]
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Don't include your email in posts on a public forum. You will get lots of spam. CP users can email you if you have ticked the 'allow private email replies' box, and you don't need to expose your email.
You shouldn't need to mess about with HTTP handlers for this, just use a traditional AJAX request sent to a URL which is handled by the normal ASP.net framework (i.e. something.aspx in the old way, or /Controller/Method in MVC).
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How to override button click event in c#
Thanks & Regards
Thahir
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Sorry?
What do you mean by "override button click event"?
Do you mean add a handler? Or prevent an existing handler from working?
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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prevent an existing handler from working.
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If the app is a .NET WinForms app where you have something that implements a Form or other Container, holding a Button having a Click handler implemented by providing an OnClick() handler, then you should provide your own override OnClick(...) handler and inide it NOT call base.OnClick(). If OTOH the current handler was added using Click+=new EventHandler(myNewClickHandler) then you have to remove that handler, either by removing the code that adds it, or by actually removing it using the -= operator.
See, it would be easier if you stated a more complete and clear question, possibly showing some code.
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I used override keyword, now it is working but triggering twice.
protected virtual void btnDate_Click(object sender, EventArgs e)
{
MessageBox.Show("Base");
}
protected override void btnDate_Click(object sender, EventArgs e)
{
MessageBox.Show("Child");
};
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Disconnect the handler? 
Why would you setup a handler and then not use it?? Granted, I know nothing about your project and or what you're doing.
Another method is to override the OnClick method. The Onxxx methods are where the events are raised from in controls. Create your own button and override the OnClick method with some code that determines in the click event should fire. If it does, just call the base OnClick method.
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Hi all,
Suppose I have a button in a windows form app that when clicked just once causes a text box to display one message, and when clicked twice causes the text box to display a different message. I have tried to use an if statement like the following to record the number of mouse clicks but it's not working.
int clickCount=1;
if (clickCount < 2)
{
txtDisplay.Text = txtDisplay.Text + "Side1";
clickCount++;
}
else
{
txtDisplay.Text = txtDisplay.Text + "Side2";
}
It appears that each time the mouse is clicked, clickCount is set to 1 instead of having the value from the previous click. How do I store a value from the previous click event and use it in the current event? Please point me in the right direction, thanks in advance.
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You need to make clickCount a static variable so it is set to 1 at the beginning of the application.
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Sorry to disagree with you, but this behavior of the static keyword corresponds to C++ and not C#. In fact, if you try to set a local variable ( i.e. defined inside a method ) as static in C#, you will obtain a compiler error.
In my opinion, the best option to have clickCount record the number of clicks is to define it as a member variable and not a local one.
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