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I am getting an exception as System.InvalidOperationException,
Additional Info: It is invalid to start a second message loop on a single thread. Use application.RunDialog or Form.ShowDialog.
My code is:
class cINI
{
[STAThread]
static void Main()
{
InitApp();
}
private static void InitApp
{
frmFirst obj = new frmFirst();
obj.ShowDialog();
}
internal static void StartApp()
{
clsLogin = new cLogin(dbUtils);
if(clsLogin.ShowLogin() == DialogResult.Ok)
Application.Run(new frmMain());
}
}
Now the frmFirst :
Here On Button click event i want to call the StartApp method, so i write
cINI.StartApp();
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Check out this article[^] and see how the form (splash screen) is run on a seperate thread.
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HI
when we are refreshing the page previous value is going and new
value is assiging
for ex: a[0]=34;
a[1]=0;
a[2]=0;
when we are working and page is refreshed and assigned a[1]=23;
now a[0]=0;
a[1]=23;
a[2]=0;
can any one help how to store all the values like
a[0]=34;
a[1]=23;
................
Thanx in advance
suman.c
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You need to realise that every time your page posts back the request is handled by a completely new instance of your page class. This means that your Hashtable field will be initialized every time.
Read up on the ASP.Net Page Lifecycle.
If you want to keep information between requests then you can store the data in a few places. Have a read up on the ViewState, Session and Application objects.
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Hi every body , i want to Delete a .wav file from linux directory '/var/spool/asterisk/monitor/20080122-182544-1201006544.4.wav' from windows machine using c#.net, can any body write me some code related to this.
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Unless you get your network admin to comprimise the entire security of the linux box, this is definately not possible from C#, neither will it be even if you are non-root on the linux box itself.
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is it possible with any other developing way to delete file. e.g. telnet c#,ssh c#.net code or any other developing code.?
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Can you get to the file via normal means ie putty or a mapped network drive?
C# isn't going to get you access to the box that you don't have using other techniques.
Russell
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1. When does this exception occur “Index out of range”?
a. Opening a database connection
b. On datatype mismatch
c. On accessing a data column not existing
d. When dead lock occurs
2. Which of the following object is used to catch a run time error?
a. Runtime.error
b. Exception.InnerException
c. Err
d. Error.runtime
3.What does WSDL stand for?
a. Web service Dynamic Language
b. World Service Data Language
c. Web service Design Language
d. Web service Description Language
4.Event supported by Dropdownlist
a. OnKeyup
b. OnKeypress
c. OnChecked
d. OnDatabound
5. Namespace used to connect SQL Server 2000 database
a. System.Oledb.SqlServer
b. System.Odbc.SqlClient
c. System.data.SqlClient
d. System.data.SqlServer
6. How to generate a javascript code at run time?
a. Page.RegisterClientScriptBlock()
b. Page.RegisterClientScript()
c. Page.RegisterScriptBlock()
d. Page.RegisterScript()
7. How many script tag can a .net page can have?
a. 5
b. 10
c. 20
d. Unlimited
8. Most efficient way of concatenating two strings
a. String1.Concat(String2)
b. String1 & String2
c. Concat(String1,String2)
d. StringBuilder.Append(String1).Appent(String2)
9. Choose odd one out
a. DataSet
b. DataTable
c. DataReader
d. DataAdapter
10. How to access a value from Web.config?
a. Configuration.AppSettings()
b. ConfigurationManager.AppSettings()
c. Configuration.Settings.AppSettings()
d. Configuration.App.Settings()
11. How to assign a javascript event to a asp.net button control?
a. Button.AssignScript(“onClick”)
b. Button.Attributes.onClick()
c. Button.Attributes.Add(“onclick”)
d. Button.Attributes.AddScript(“Onclick”)
12. If Session.timeout=30. When will the session expire?
a. 30 Milliseconds
b. 30 Minutes
c. 30 Seconds
d. 30 Hours
13. Which of the following method transfers control from one page to another and preservers the form values in the first page.
a. Server.Transfer()
b. Response.Redirect()
c. Request.Show()
d. Request.Display()
14. A Web service can only be written in .NET?
a. True
b. False
15. A set of tables are maintained in a Dataset as
a. TablesCollection object
b. DataTableCollection object
c. DataRowsCollection object
d. TableRowCollection object
plz help....
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You forgot,
16. How does a student learn C#:
a. Ask people to do his/her homework.
b. Programming is stupid, I'd rather be a movie star.
c. He/she takes the initiative and does a few simple google searches.
d. Learn to write and even speak in native binary, C# is bound to be easier then...
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Answer of Question 1
(from your options)
c. On accessing a data column not existing
in general this exception occurs when someone try to access the index an array that is outside the bounds of the array.
Answer of Question 2
None of the mentioned choices..
Answer of Question 3
None of the mentioned choices..
Answer of Question 4
a,b
Answer of Question 5
c
Answer of Question 6
None of the above
Page.ClientPage.RegisterClientScriptBlock() //Check this.
Answer of Question 7
Not sure
Answer of Question 8
StringBuilder.Append
Answer of Question 9
c
Answer of Question 10
c
Answer of Question 11
c
Answer of Question 12
30 Minutes (not sure)
Answer of Question 13
Server.Transfer (again google about it)
Answer of Question 14
False
Answer of Question 15
b
AND THE ANSWER TO ALL THESE QUESTIONS IN ONE WORD "GOOGLE"
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http:\\www.google.com 
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1. Neither
2. Neither
4. Neither
6. Neither
8. Neither
Experience is the sum of all the mistakes you have done.
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No wonder so many people passing software courses nowadays...
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Can anybody help me getting the "CrystalRuntime.Application",
i am new to crystel report .. i am converting some VB code in to C#
but i dont know how to convert following code...
Dim vorep As New CRAXDRT.REPORT
If avoA Is Nothing Then
Set avoA = CreateObject("CrystalRuntime.Application")
End If
Set vorep = avoA .OpenReport(Report)
vorep.EnableParameterPrompting = False
If vorep.HasSavedData Then
vorep.DiscardSavedData
End If
can anybody help me here....
T@SU
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Any one know how to create an airbrush drawing tool.
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I would guess that you will need to randomly choose a certain number of pixels within the brush area, and color them as needed. I think that the distribution function is uneven for that type of effect, so you should probably do something like picking a radius and and angle, then coloring that pixel. That way, the center has a higher probability of being colored than the outside. Good luck,
Sounds like somebody's got a case of the Mondays
-Jeff
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You might want to google: Paint .NET, it is an entire drawing suite that I believe was written in VC#, if not VC# at least .NET. It is Open Source 
Regards,
Thomas Stockwell
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Visit my homepage Oracle Studios[ ^]
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Hi All,
I have a win app with two forms involved. Form1 opens up Form2. When I go to close Form2 I want to refresh some grids on Form1. I tried setting up a custom eventhandler but its kind of hokey. I need some way to call a method in Form1 from Form2. Does anyone have the best way to do this? I passed a Form1 reference to Form2 and tried to see if a public method that I declared in Form1 was visible but doesn't show up. So I went with trying to create a custom event in Form1 and calling it from Form2 but not sure the best way to do this, any ideas?
Thanks,
JJ
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A quick question. Is Form2 shown modally? If so, at the point the Form2 is closed (right after it is declared in whatever method Form1 instantiates it), that is where you can refresh your data.
If the above situation doesn't work for you, I would consider reworking the whole public method thing you tried. Perhaps you didn't pass reference of Form1 to Form2, instead, you passed reference to a regular System.Windows.Forms.Form.
Something like
public void OpenForm(Form myForm)
is NOT the same as
public void OpenForm(Form1 myForm)
because Form1 is the actual object that would have your method contained in it.
That is probably why you didn't see that method show up in your Intellisense list. (I don't know, I'm just taking a guess...)
Hope that helps.
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In .net best thing to do this is through Delegates
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How to change cursor?
This not working!
Cursor.Current = Cursors.Cross);
Thanks.
Alex
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What is not working?
You might want to take the ) out of your code.
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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try myForm.Cursor=Cursor.Cross;, each Control has a Cursor property.
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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