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My son needed to create a table of some numbers for some homework this week, so I wrote a small WinForms app to do it. Here's a snippet:
private void DisplayTable()
{
int rows = (int) this.numericUpDown1.Value ;
System.Text.StringBuilder html = new System.Text.StringBuilder() ;
html.AppendFormat ("<html><head><title>{0}</title></head><body><table cols='{1}' width='100%' border='1'><tr><th>Row</th>" ,
this.textBox2.Text , this.columns.Count + 1 ) ;
for ( int c = 0 ; c < this.columns.Count ; c++ )
{
html.AppendFormat ( "<th>{0}</th>" , this.columns [ c ].Item1 ) ;
}
html.Append ( "<th>Total</th></tr>" ) ;
for ( int r = 1 ; r <= rows ; r++ )
{
html.AppendFormat ( "<tr><td>{0}</td>" , r ) ;
int tot = 0 ;
for ( int c = 0 ; c < this.columns.Count ; c++ )
{
int val = this.columns [ c ].Item2 * r ;
html.AppendFormat ( "<td>{0}</td>" , val ) ;
tot += val ;
}
html.AppendFormat ( "<td>{0}</td></tr>" , tot ) ;
}
html.Append ( "</table></body></html>" ) ;
this.webBrowser1.DocumentText = html.ToString() ;
}
P.S. I also have apps that generate DataTables.
modified 25-Jan-12 11:06am.
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PIEBALDconsult wrote: My son needed to create
PIEBALDconsult wrote: so I wrote
The difficult we do right away...
...the impossible takes slightly longer.
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Disturbingly for him, he only got a C-.
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There was no requirement as to how to create the table, I assumed that using a computer program to do so was OK. As I didn't feel like teaching him Excel, I wrote a program that would allow him to create the table.
Furthermore, he had completed his ilegible hand-drawn table before I finished with the program anyway.
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Yeah - but it was a woodwork class...
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Well, I voted this response up, simply because I like the warm feeling of thinking about a father helping his son to code.
Depending on the age of his son, and the nature of the class, and the teacher's qualifications, and what his peers may, or may not, know, about .NET, or C#: what happens when the teacher asks him to explain his solution to the class, though 
best, Bill
"Science is facts; just as houses are made of stones: so, is science made of facts. But, a pile of stones is not a house, and a collection of facts is not, necessarily, science." Henri Poincare
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It was a math class, he simply had to produce and use a table with some numbers in it to get some values to answer a few questions. The table was only an aid to answering the questions, not the answer itself. He didn't need to code, but I had hoped that he might see how having such a useful skill could benefit him.
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I am a beginner in asp. I have a link like some thing like this http://www.mysite.com/default1.asp?id="9" . I need to change this url into like this href="http://www.mysite.com/ar/default1.asp?id="9" on a clicking a button. Means on clicking this button it will get change the url "/ar/" and the next click it will remove "/ar/" . Please some one help me to do this.
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You might get better responses if you post this in the ASP.NET forum.
The difficult we do right away...
...the impossible takes slightly longer.
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Hi,
i need to find a "Outlook Task" with a special UserProperty like "id". I know how to find a contact with this property, but this doesn't work with a task.
Contactitem:
Outlook.ContactItem contact = (Outlook.ContactItem)contactItems.Find(String.Format("[Email1Address]='{0}' and " + "[User3]='{1}'", mail_s, master_s));
I need Help please! Thank's a lot
regards
ww
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Hi
When I could change the text at runtime, I think the property was called Capture.
How do you do in Visual Studio 2010?
If I set the button btn's property Text to "By" and try the below
btn.Text="Hi"
nothing happens.
How do I do it nowadays 
Many Thanks
Fia
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What do you mean, "Nothing Happens".
If "btn" is a control on your form or webpage(depending on your solution type), then this will change the text shown on the button.
I think that you have not given us a clear picture of your issue. Could you describe it a little more?
I wasn't, now I am, then I won't be anymore.
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Hi again
What I mean with "nothing happens" is that the button btn's text is still By.Even if the bool folder's property Visible is changed to true. I have tried
I have the code in the buttons click event.
private void btn_Click(object sender, EventArgs e)
{
if (folder.Visible==true )
{
btn.Text = "Hi";
}
else
{
btn.Text = "By";
}
}
I have tried btn.Invalidate(); and Form1.Invalidate(); it didn't help. And I also tried with Refresh() and Update() on both btn and Form1.
Dear KP Lee
I don't understand how to or what you mean I should do
"I fixed that by assigning a delegate in the winapp, running the calculations on another thread and calling the delegate."
Many Thanks
Fia
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I'd try to change the condition to
if (btn.Text == "By") just to try if the Text change works.
If it does, you should investigate how folder.Visible is connected to your button text.
Ciao,
luker
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The other thing to check is that the click event is hooked to the event handler: put a breakpoint on the first line to make sure it is being executed, and then single step through.
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Hi
Thanks for your answers.
I have already stepped through the code and it's running as it should, but the button's Text still doesn't change.
I don't understand what to do????.
Many Thanks
Fia
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OK: I took an existing form, and dropped a button on it.
I double clicked the button and in the handler method that came up:
private void button1_Click(object sender, EventArgs e)
{
button1.Text = button1.Text == "Hello" ? "Goodbye" : "Hello";
}
When I ran the app, the button caption was "button1".
When I pressed it the first time, it changed to "Goodbye"
A second click, it became "Hello".
Third click, back to "Goodbye", and round and round.
What am I doing that is different to you, or you doing that is different to me?
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Hi
I can't see any difference.
Here is my code.
private void btn_Click(object sender, EventArgs e)
{
if (folder.Visible==true )
{
btn.Text = "Hi";
}
else
{
btn.Text = "By";
}
}
The variable folder is just a bool variable. When I debug my code I can see that it runs as it should, but still the button's Text doesn't change.
I don't know if it has anything to do with the problem, but I have a FileLListbox and a FolderListBox from Alva on the form. Should that be the problem.
Many Thanks
Fia
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Try something quick: Put a breakpoint on the if line of the handler, and change teh button text in the designer to "TEST".
Run your app, and press the button. Look at btn.Text in the debugger - is it "TEST"?
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Hi
I tried that and the text is "Test". I tried also to remove all Alva controls, but I still can't change the text on the button. 
Thanks
Fia
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So at least we can be absolutely sure that the right button is hooked up - if you replace the handler content with
btn.Text = "WTF!"; and single step over that one instruction, is the text still "Test" or "WTF!" - I'm just wondering if the text is being changed back somewhere else (which would be a weird thing to do automatically)
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Hi
It changes to "WTF" in the code, but after the event. The buttons text is "Test"?????
Thanks
Fia
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Something has got to be changing it back!
Delete it.
Rebuild.
That should give you any errors that refer to it.
If there aren't any, put it back and repeat the above, see if it works.
Either that or you have a PC full of malevolent pixies... 
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Put a breakpoint in your code in this routine. Search through your code for all instances of the word Test and put breakpoints on them all - each and everyone. Run the program again and note each breakpoint you hit - you must be resetting the text back to Test after you have left this routine.
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Trying that statement shouldn't even compile. Assuming you didn't complete the statement you really used (with a semi-colon,) this will normally cause the button to refresh and show "Hi" (Without quotes) like your other responder said.
You can try to force a refresh with an .Invalidate
Once, I tried to execute complex logic and print intermediate results by modifying text boxes' .Text property. Wanted to know why that wasn't working. Your winapp has to be idle and waiting for a response before it will render the changes.
I fixed that by assigning a delegate in the winapp, running the calculations on another thread and calling the delegate.
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