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The code snippet that I showed is the actual rtb name... The thing is that I want to clear the screen so I can see that the software is processing obtaining and encoding bytes into hex equivalent string and display.
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Just a guess:
maybe you are doing the rtb.Text="" in some other thread (which is illegal!)
and sometimes it works, sometimes it fails (it should always throw an Exception since
.NET 2.0 unless you set CheckForIllegalCrossThreadCalls=false, which one should never do !!).
If so, read up on Control.InvokeRequired and Invoke.
If not, give it a try with Application.DoEvents() following rtb.Text=""; if that helps,
consider it a hack, and try to move the code following it into asynchronous execution
(a separate thread, or something based on timer ticks).
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THAAAAAARRRRR SHE BLOOOOOWWSSSS!
Thanks for the help! its the Application.DoEvents() DOES help! I've used that before and must've forgotten that! Thanks a heap!
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umm one more thing...
What do u mean "consider it a hack" in the following quote:
"If not, give it a try with Application.DoEvents() following rtb.Text=""; if that helps,
consider it a hack, and try to move the code following it into asynchronous execution
(a separate thread, or something based on timer ticks)."
Can u clarify that? Thanks! I'm not sure of the meaning of it.
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GUI design rules include the requirement to be responsive at all times, resulting in a
maximum time any action on the GUI thread is allowed to take (some 10 to 30 msec).
If so, there is no need for DoEvents().
Longer operations should be executed in the background, on a separate thread (or
be chopped into smaller pieces and sequenced somehow, e.g. using timer ticks).
There is a pseudo-solution consisiting of calling DoEvents() once or several times
while inside some long method running on the GUI thread; this allows the GUI to update
itself to some degree, but does not offer full responsiveness, hence it is a hack.
There are other requirements, such as:
lengthy operations should indicate they are running (the bare minimum is a WaitCursor);
lengthy operations should show a decent progress indication (Windows often fails to do
that itself);
lengthy operations should be cancellable.
Of course it is up to the designer how far to carry this; it does influence user's
experience tho.
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Hmm thanks for the informative response. I've learned something new.
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Hi,
I have populated a hashtable called CacheHashTableForwards.
This is how the hashtable gets populated:
CacheHashTablesForwards.Add(IndexName, code)
...
Now I would like to sort this data which is inside the Hashtable.
Not sure if this is a good approach but I use an ArrayList to do this as follows:
CacheHashTablesForwardsArraySorted = new ArrayList(CacheHashTablesForwards.Keys)
As you can see, The sorted array does not contains the other column, i.e. code
How can I properly sort using the arraylist.
Thanks
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Hi,
your ArrayList CacheHashTablesForwardsArraySorted is NOT sorted:
1) the Keys property of a hashtable returns an ICollection containing all the keys, but
MSDN clearly states "The order of the keys in the ICollection is unspecified"
2) giving it a name ending on "Sorted" doesnt do it either.
So you must explicitly sort your ArrayList.
Afterwards, you can enumerate the sorted list, and use the hashtable to look up the
corresponding values.
The alternative is to use a SortedList instead of a HashTable; that one does it all.
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Hello again,
I am now fully using sortedList()
This seems to be what I was looking for.
What is the difference between hashtable and sortedlist apart from the sort please?
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Well, the MSDN documentation is rather abundant on these. Havent studied it in detail.
Seems like SortedList uses just two arrays (and hence needs frequently copying stuff
to insert/remove items), think of it as a normal List that makes sure it remains sorted
at all times, whatever the cost.
HashTable does not care about sorting, it applies a bag of tricks for maximum
performance: it uses a hashing scheme, and linked lists
so it offers best performance especially for large collections or frequent inserts/removals.
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arkiboys wrote: CacheHashTablesForwardsArraySorted = new ArrayList(CacheHashTablesForwards.Keys)
Assuming 'IndexName' implements IComparable, then you can simply add:
CacheHashTablesForwardsArraySorted.Sort();
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I begin learn C#. in C# do not have keyword ReDim Preserve and I wonder how can I change the code below in to C#.
Dim i() as string
Redim i(0)
i(0)= "abc"
ReDim Preserve i(2)
i(1) = "you are the best"
i(2) = "thanks"
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LyBun wrote: C# do not have keyword ReDim Preserve
So, what does it do?
Upcoming events:
* Glasgow: Mock Objects, SQL Server CLR Integration, Reporting Services, db4o, Dependency Injection with Spring ...
* Reading: Developer Day 5
Ready to Give up - Your help will be much appreciated.
My website
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Hi,
there basically are two approaches:
1.
use an array; when it needs to grow, create a new one and copy the contents
(e.g. using Array.Copy)
Thats what ReDim does behind the scenes.
2.
use a collection, such as an ArrayList or a List. These act like stretchable arrays,
but are a bit slower in accessing their elements.
So to choose one or the other you must balance the add/remove operations against the
read/write operations.
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Hello Luc,
For strings I like to use the dynamic:
System.Collections.Specialized.StringCollection dynstringarray = new System.Collections.Specialized.StringCollection();
All the best,
Martin
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Hi Martin,
I did not know StringCollection.
I created my own StringList back in the 1.x times, and am still using it...
Thanks for the info.
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Glad I could give you a info!
Doesn't happen so often.
All the best,
Martin
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Dear gurus,
I want to make a statistics on the words of any text within a pdf-file.
Do you know how I can access a pdf for my purpose?
thanks in advance
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Hint: try to search CP articles containing the word pdf.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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Hi all,
I am reandering a Data Grid from my web part containing a paging event its giving me post back but grid is rendering twise on the page.
Any suggestion???
<br />
protected override void CreateChildControls()<br />
{<br />
DataTable data = null;<br />
string[] columnArray = null;<br />
bool IsColumns = false;<br />
DataTableValidationStatus tableStatus;<br />
<br />
try<br />
{<br />
if (!String.IsNullOrEmpty(Columns))<br />
{<br />
columnArray = Columns.Replace(" ", "").Split(',');<br />
IsColumns = true;<br />
}<br />
<br />
data = GetDataTable();<br />
tableStatus = Utility.ValidateDataTable(data, true, true, IsColumns, columnArray);<br />
<br />
if (tableStatus == DataTableValidationStatus.Valid)<br />
{<br />
data.Locale = System.Globalization.CultureInfo.InvariantCulture;<br />
<br />
grid.EnableViewState = true;<br />
grid.AutoGenerateColumns = false;<br />
grid.AllowPaging = true;<br />
grid.PageSize = PageSize;<br />
grid.CurrentPageIndex = currentpageindex;<br />
grid.PagerStyle.Mode = PagerMode.NextPrev;<br />
grid.PagerStyle.CssClass = PagerStyleCssClass;<br />
<br />
grid.CssClass = GridCssClass;<br />
grid.AlternatingItemStyle.CssClass = AlternatCssClass;<br />
grid.HeaderStyle.CssClass = HeaderCssClass;<br />
grid.ItemStyle.CssClass = ItemCssClass;<br />
<br />
grid.Width = System.Web.UI.WebControls.Unit.Percentage(100);<br />
<br />
grid.PageIndexChanged += new DataGridPageChangedEventHandler(this.grid_PageIndexChanged);<br />
<br />
grid.DataSource = data;<br />
grid.DataBind();<br />
Controls.Add(grid);<br />
}<br />
}<br />
<br />
private void grid_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)<br />
{<br />
currentpageindex = e.NewPageIndex;<br />
BindGrid();<br />
}<br />
Anuj
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Hi All,
I want to use the outlook application in my program i want to use it's option without opening it.
I hear about a line code but i need more help about that.
merwa
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Here's[^] an example on MSDN of how to use MS Outlook in C#.
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in remoting, the choice of the channel for intranet application without firewall protection or allowing communication thru some port, is mostly TCP.we can achieve our functionality by http channel as well.but by using TCP we get performance gain since TCP is faster than HTTP.
Can anyone clarify why communication over TCP channel is Faster than on Http channel
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