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Right, I would write that first example as:
if (ex is COMException)
{
return ((COMException)ex).ErrorCode.ToString();
}
"Omit needless local variables." -- (To modernize Strunk)
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Got it.
I had to create a new COMException, and cast into that.
COMException COMex = new COMException();<br />
<br />
COMex = (COMException)ex;
then I was fine.
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JoeRip wrote: I had to create a new COMException
No, you didn't. this would have worked just fine:
COMException COMex = (COMException)ex;
The reason it failed initially is that you tried to reuse the ex variable which was already defined as Exception:
ex = (COMException)ex;
You should definately read up on the C# is and as keywords as they are better suited to what you are trying to do.
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Yeah, Martin set me straight. Is and As are exactly what I needed, very helpful. I've rewritten the section using Is and As, it all works excellently.
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hi every body i need ur help .. i am doing program in windows appplication using C# code .so i created one combo box and i populate data from database using ds . then so i dont want 2 edit in seleteditem in combobox..plzz tell me wht should i do now.plz ..help me...
thanks 2 all..
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First of all, use proper English when posting your question. Secondly, if you set DropDownStyle property to ComboBoxStyle.DropDownList, users won't be able to change the text of current item. However they will able to select another item from the drop down list
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brother thanks its working.... next time ii ll use proper eng ..ok bye thanks..
thanks 2 all..
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Hi all,
I have found the following code on how to fill a tree view control with one's directory structure, but it is in VB. Can anyone please help me to translate into C#?
' In general Declarations
Dim tvn As Node
Private Sub Command1_Click()
Me.MousePointer = vbHourglass
TreeView1.Nodes.Clear
' Pathname to create folder/file list from
p$ = Dir1.Path
If Right$(p$, 1) <> "\" Then p$ = p$ + "\"
Set tvn = TreeView1.Nodes.Add(, tvwParent, p$, p$)
RecurseFiles2 p$
Me.MousePointer = vbDefault
End Sub
Sub RecurseFiles2(ByVal fPath As String)
Dim File_Name As String
Dim File_Read As Integer ' Number of Files Read
Dim strTempPath As String
Dim i As Integer
If Right$(fPath, 1) <> "\" Then fPath = fPath & "\"
' to do a pattern match do, or something.
' folders won`t be included in the list (not my fault)
' File_Name = Dir$(fPath+"\*.exe", vbDirectory)
File_Name = Dir$(fPath, vbDirectory)
File_Read = 1
Do While File_Name <> ""
If File_Name <> "." And File_Name <> ".." Then
strTempPath = fPath & File_Name
If GetAttr(strTempPath) And vbDirectory Then
Set tvn = TreeView1.Nodes.Add(fPath, tvwChild, strTempPath + "\", File_Name)
RecurseFiles2 strTempPath ' if a folder, then call this routine to scan that folder (recursion)
File_Name = Dir$(fPath, vbDirectory)
For i = 2 To File_Read
File_Name = Dir$
Next
Else
Set tvn = TreeView1.Nodes.Add(fPath, tvwChild, strTempPath, File_Name)
End If
End If
File_Name = Dir$
File_Read = File_Read + 1
Loop
End Sub
Many Thanks
Regards,
The only programmers that are better that C programmers are those who code in 1's and 0's ![Green Alien | [Alien]](https://www.codeproject.com/script/Forums/Images/alien.gif)
 Programm3r
My Blog: ^_^
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There are code converters available on the web that will do this. I suggest you use one of those.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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Thanks for the reply pmarfleet. Do you know of any good ones?
Thanks again ....
Regards,
The only programmers that are better that C programmers are those who code in 1's and 0's
Programm3r
My Blog: ^_^
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I don't use code converters - I don't have any need for them. However a Google search threw up the following results[^].
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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Hello...
Can some body help me with Timer?
I want to display the data from my database. For an example:
i) 1st data will be displayed ( 10 seconds)
ii)After 10 seconds finish, 2nd data will be displayed
iii) These data will be displayed continuously (looping)
Please help me.
Thanks in advance
Jac
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where do you and which way do you want show the data?
you can read the data at a time and simply use a timer to display on time
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I have done something like the code below.
It will display the data but, it won't display for 10 seconds
it will read all the data from database then only the timer stop for 10 seconds.
What i'm expected is, each data display at 10 seconds of time then only continue to the next data and so on...
public load(....)
{
Timer myTimer = new Timer();
myTimer.Interval = 10000;
myTimer.Enabled = true;
myTimer.Tick += new EventHandler(Timer_Tick);
}
public void Timer_Tick(object sender, EventArgs e)
{
string conStrg;
conStrg = ("Data Source=DIMENSION3000\\SQLEXPRESS;Initial Catalog=kMasjid;User ID=sa;password=123456");
SqlConnection connTimer = new SqlConnection(conStrg);
connTimer.Open();
string selSQL = "Select txtDesc FROM txtScroll";
SqlCommand com = new SqlCommand(selSQL, connTimer);
SqlDataReader reader = com.ExecuteReader();
DataSet ds = new DataSet();
while (reader.Read())
{
alphaTxtMain.Text = " " + reader["txtDesc"];
myTimer.Interval = 10000;
myTimer.Stop();
}
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Hi Jacklynn,
i see in your code the myTimer.Stop(); while reading from the db,
where is the myTimer.Start();??
Nassos
GanDad
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simple dude ........if u have a auto number or a counter in ur database
then u can do it ....................
step 1: start the timer in form load
step 2: write a event ............
step 3: assign that event to timer
srep 4: write a perfect query in event like
"select * from tablename where counter = @counter";
step 5; add the parameter n assign it to a integer which will increement each time the event is triggered
step 6 : last but not the least assign the output to a grid ........
important clear the grid each time
its me sid
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Dude..have done like the code below but the data cannot display for 10secs.
public load(....)
{
Timer myTimer = new Timer();
myTimer.Interval = 10000;
myTimer.Enabled = true;
myTimer.Tick += new EventHandler(Timer_Tick);
}
public void Timer_Tick(object sender, EventArgs e)
{
string conStrg;
conStrg = ("Data Source=DIMENSION3000\\SQLEXPRESS;Initial Catalog=kMasjid;User ID=sa;password=123456");
SqlConnection connTimer = new SqlConnection(conStrg);
connTimer.Open();
string selSQL = "Select txtDesc FROM txtScroll";
SqlCommand com = new SqlCommand(selSQL, connTimer);
SqlDataReader reader = com.ExecuteReader();
DataSet ds = new DataSet();
while (reader.Read())
{
alphaTxtMain.Text = " " + reader["txtDesc"];
myTimer.Interval = 10000;
myTimer.Stop();
}
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i dint get u...data is not at all displayed or its blinking...?
its me sid
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Mmm..it's like blinking.
Supposed that, the output is 10secs for each data to be displayed.
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Hi.
You can use above meta tag which refresh every 5 seconds your page. U can use it in also.
I hope can help this.
Thanks
<div class="ForumSig">"Good Thing Goes With Good People..."</div>
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I have a WindowsForm project.
When I open a dialogForm from my MainForm, do nothing.
Then I close this dialog.
This time VS2005 report "InvalidOperationEception: Invoke or BeginInvoke cannot be called on a control until the window handle has been created." at "Application.Run(new MainForm());"
what cause can beget this exception?
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Can we see the code?
Are you calling Invoke or BeginInvoke directly?
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#region Open dialog part<br />
private void btnSetting_Click(object sender, EventArgs e)<br />
{<br />
OpenSettingForm();<br />
}<br />
<br />
private void OpenSettingForm()<br />
{<br />
FormSetting frmSetting = new FormSetting(this.localUIN.ToString(), this.localInfo.NickName, this.localInfo.Sign, ServiceURL, this.pictureBox1.Image, this.tabControl1.Tabs, this);<br />
<br />
frmSetting.Width = 535;<br />
frmSetting.Height = 505;<br />
frmSetting.Owner = this;<br />
frmSetting.ShowDialog();<br />
}<br />
#endregion<br />
<br />
#region close dialog part<br />
private void ApplySettings()<br />
{<br />
int myuin = Convert.ToInt32(uin.Substring(1));<br />
<br />
if (!string.Empty.Equals(this.txtNick.Text.Trim()) && !this.oldNick.Equals(this.txtNick.Text.Trim()))<br />
{<br />
if (this.callService.UpdateNick(myuin, this.txtNick.Text) > 0) <br />
{<br />
FreeAssemblage.SetSettings(this.uin, "Nick", this.txtNick.Text.Trim());<br />
}<br />
}<br />
<br />
if (!this.oldSign.Equals(this.txtSign.Text))<br />
this.callService.UpdateSign(myuin, this.txtSign.Text);<br />
<br />
FreeAssemblage.SetSettings(this.uin, this.hashConfig);<br />
<br />
this.frmMain.OperateHistory(this.chkHistory.Checked);<br />
}<br />
<br />
private void btnApp_Click(object sender, EventArgs e)<br />
{<br />
ApplySettings();<br />
<br />
this.btnApp.Enabled = false;<br />
}<br />
<br />
private void btnOK_Click(object sender, EventArgs e)<br />
{<br />
if (true == this.btnApp.Enabled)<br />
{<br />
ApplySettings();<br />
}<br />
<br />
this.Close();<br />
<br />
}<br />
#endregion
-- modified at 4:23 Monday 19th November, 2007
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