Re: a query - C# Discussion Boards

19-Feb-07 20:40

In form1,i defined it like :
namespace WindowsApplication1
{
public partial class form1 : Form
{
public DateTime n;
SqlConnection conn = new SqlConnection("Data Source=PROGRAMER;Initial Catalog=....");
.....
}

In form2,i made object of form1:
System.Windows.Forms.Form form1_ = new form1();
string d = form1_.n;
-- BUT it is giving error on 'n' here, 'n' doesnot come on click of'.' after form1_

I hav used it like this in form1:
private void button1_Click(object sender, EventArgs e)
{
conn.Open();

string strQury = "";
strQury = "insert into dashboarddealerlogin (logoutdatetime) values '(" + DateTime.Now + ")'";
SqlCommand cm = new SqlCommand(strQury, conn);
n = Convert.ToDateTime(cm.ExecuteScalar());
}
Is my global declaration of 'n' still not proper?
Thank You.
Nekshan.
-- modified at 2:48 Tuesday 20th February, 2007

virendra patel19-Feb-07 21:00

virendra patel

19-Feb-07 21:00

'all things is all right .I THINK U Assign n as date and here u declare string.so it might get error.
'string d = form1_.n;
' used like this
datetime n = form1.n;
'& u used from1 is the name of form right?

Nekshan19-Feb-07 21:55

19-Feb-07 21:55

datetime n = form1.n;
-- Not Working:error on 'n'.
Nekshan.

Guffa19-Feb-07 21:24

Guffa

19-Feb-07 21:24

I see three errors in your code.

1. You have declared the reference form1_ as a reference to a Form object, not a form1 object. Therefore you only have access to the members of the base class, none of the members of the inherited class.

2. You are creating a completely new instance of form1, that means that it's separate from the instance that already exists. This in turn means that the n member has not been set for that instance.

3. You are executing an insert query and expect it to return data. The result from an insert query is empty, so the ExecuteScalar method will return null. This will be converted to DateTime.MinValue by the Convert.ToDateTime call.

---
single minded; short sighted; long gone;

Sandeep Akhare19-Feb-07 21:37

19-Feb-07 21:37

Take a look on it
http://www.codeproject.com/useritems/pass_data_between_forms.asp

<l>Thanks and Regards
Sandeep

Nekshan19-Feb-07 22:01

19-Feb-07 22:01

Thanx Sandeep.
The project u suggested is really nice.
Nekshan.

Sandeep Akhare19-Feb-07 22:20

How to send back value to the Main WinForm? [modified]

19-Feb-07 22:20

My Pleasure Smile | :)

<l>Thanks and Regards
Sandeep

Stopping a Thread

nasambur19-Feb-07 20:22

nasambur

19-Feb-07 20:22

Hi,

I'm writing a LoadGenerator application, in which for a specific period of time
certain no.of Threads are created and executes simultaneously..
That i call as RampUp threads.

After sleeping for a sustain period (10secs) of time.. I want to RampDown threads, that is i want to kill the threads one by one..

I have defined an ArrayList object alThreads to maintain the Threads list..

RampUp() method

public void RampUp()
{
  for(int i=0; i<10; i++)
  {
    Thread thread = new Thread(ExecuteSingleThread);
    thread.Start();
    if(alThread.Contains(thread) == false)
    {
      alThreads.Add(thread);
    }
    Thread.Sleep(5000);
  }
}

The below code kills the thread every five second..

RampDown() method

public void RampDown()
{
for(int i=0;i<alThreads.Count;i++)
  {
    Thread thread = (Thread)alThreads[i];
    if(thread.IsAlive)
      thread.Abort();
    Thread.Sleep(5000);
  }
}

Now the problem is after killing the first thread, all the remaining threads
doesn't executes the code inside it..

Please help me..

regards,
nas

Khoramdin19-Feb-07 20:07

Khoramdin

19-Feb-07 20:07

Hello,

I am trying to create an Windows Application using Visual C# and I am having the following problem.

I have a second WinForm (Form2) which is used for login. I would like to send the login information back to main window (Form1) in order to display it there. Currently, I am able to do so but I am using the following code:

private void button1_Click(object sender, System.EventArgs e)

{
Form2 frm=new Form2();
frm._textBox=_textBox1;
frm.Show();
}

This does the job but it opens a NEW window. Is there anyway that I can simply refresh my existent window rather opening a new one?

Thank you.

Khoramdin

Martin#19-Feb-07 20:49

Martin#

19-Feb-07 20:49

Hello,

This is a very often asked question.

Look at this answere
http://www.codeproject.com/script/comments/forums.asp?msg=1745542&forumid=1649&XtraIDs=1649&searchkw=angus&sd=22+Nov+2004&ed=20+Feb+2007&author=Martin%23&stype=1#xx1745542xx[^].

I always give the advice, to look at this very good article from Colin Angus Mackay:
http://www.codeproject.com/dotnet/passingvaluesbetweenforms.asp[^]

All the best,

Martin

Khoramdin20-Feb-07 9:42

Khoramdin

20-Feb-07 9:42

Hello Martin,

Thanx for the message. It was a great help. I managed to get this going but I have one question.

I followed the article and managed to pass only ONE variable between Parent and Childs. I am not sure if there is a way to pass more than one variable or I am missing something.

Thanx again for your help, mate.

Khoramdin

Martin#20-Feb-07 20:37

Martin#

20-Feb-07 20:37

Hello,

I'm glad I could help!

Khoramdin wrote:
I am not sure if there is a way to pass more than one variable or I am missing something

You could:
)work with more than one property

)use a struct

)use a class

)use a collection, like Hashtable or ArrayList or ...

All the best,

Martin

Rhys Gravell19-Feb-07 20:53

Rhys Gravell

19-Feb-07 20:53

Look at the ShowDialog method of a form for opening a Modal Dialog

<br />
using (MyForm myForm = new MyForm())<br />
{<br />
	myForm.ShowDialog();<br />
}<br />

...and overloading the form constructor and/or return to provide the data you want.

Rhys

ELYSIUM, n. An imaginary delightful country which the ancients foolishly believed to be inhabited by the spirits of the good. This ridiculous and mischievous fable was swept off the face of the earth by the early Christians -- may their souls be happy in Heaven!

Ambrose Bierce (1842 - 1914)

Behind every argument is someone's ignorance.

Louis D. Brandeis (1856 - 1941)

a query [modified]

Nekshan19-Feb-07 19:51

19-Feb-07 19:51

private void logout_Click(object sender, EventArgs e)
{
conn.Open();
string strQury = "";
strQury = "insert into dashboarddealerlogin (logoutdatetime) values '(" + DateTime.Now + ")'";
SqlCommand cm = new SqlCommand(strQury, conn);
int n = Convert.ToInt32(cm.ExecuteScalar());
}

I have written this code in form1.cs and i need to write it there only on 'logout_click'.
Now i want to use this 'int n' in a function in form2.cs of same project:
funEntrylogin(m, i, tb_id.Text, tb_pswd.Text, DateTime.Now,n);
but here it is giving error on 'n',if i write the above code, as 'n' is not declared in form2.cs.
How can i declare this 'int n' of form1 in form2?
How can i do this?
thanx.
nekshan.

-- modified at 1:57 Tuesday 20th February, 2007

virendra patel19-Feb-07 20:05

virendra patel

19-Feb-07 20:05

'form1
' define this n globally on top of form1
Public n As Integer

' form2
' create objec to from1 in from2
Dim f1 As New Form1

' used like
string s = f1.n

'this declaration is vb convert it to c# ok.

Re: a query [modified]

Nekshan19-Feb-07 20:39

19-Feb-07 20:39

In form1,i defined it like :
namespace WindowsApplication1
{
public partial class form1 : Form
{
public DateTime n;
SqlConnection conn = new SqlConnection("Data Source=PROGRAMER;Initial Catalog=....");
.....
}

In form2,i made object of form1:
System.Windows.Forms.Form form1_ = new form1();
string d = form1_.n;
-- BUT it is giving error on 'n' here, 'n' doesnot come on click of'.' after form1_

I have used it like this in form1:
private void button1_Click(object sender, EventArgs e)
{
conn.Open();

string strQury = "";
strQury = "insert into dashboarddealerlogin (logoutdatetime) values '(" + DateTime.Now + ")'";
SqlCommand cm = new SqlCommand(strQury, conn);
n = Convert.ToDateTime(cm.ExecuteScalar());
}
Is my global declaration of 'n' still not proper?
Thank You.
Nekshan.

-- modified at 2:51 Tuesday 20th February, 2007

Sandeep Akhare19-Feb-07 20:08

19-Feb-07 20:08

Hi
Use Query string or you can put this varaible in the session and get it from the session on next page

<l>Thanks and Regards
Sandeep

Nekshan19-Feb-07 20:16

19-Feb-07 20:16

session? i m doing windows programming.
can i use session in windows programming? i dont think so..
if can... how?
Thank You.
nekshan.

Sandeep Akhare19-Feb-07 20:22

19-Feb-07 20:22

Sorry Boss
You should mension that

<l>Thanks and Regards
Sandeep