C# Discussion Boards - CodeProject

Re: what is the maximum size

Thomas Krojer25-Nov-09 20:47

Thomas Krojer

25-Nov-09 20:47

Take a look at the StreamReader Class.

Re: what is the maximum size

Joe Rozario25-Nov-09 21:26

Joe Rozario

25-Nov-09 21:26

Thank you friend,

Thanks for Your replay ......

i made small mistake .... $Shucks | :-\$

thank you.

by

joe

Re: what is the maximum size

Member 218499725-Nov-09 20:56

Member 2184997

25-Nov-09 20:56

Please don't read a 2gb file all at once. Thats just insane. Read it a little bit at a time, say, 1 mb or 10 mb, or whatever. Like the other guy said, check out StreamReader.

Re: what is the maximum size

Joe Rozario25-Nov-09 21:28

Joe Rozario

25-Nov-09 21:28

Thank you friend,

Thanks for Your replay ......

i made small mistake .... $Shucks | :-\$

i am not reading 2G file at time i am reading 100kb at time ...anyhow thanks for your suggestion.

thank you.

by

joe

Re: what is the maximum size

harold aptroot25-Nov-09 23:14

harold aptroot

25-Nov-09 23:14

IIRC it depends on 32 vs 64 bit.
But, in any case, will you really be happy if one program fills up all of most (or at least a sizable chunk) of your RAM?
Btw, surely you mean a long not a double

Re: what is the maximum size

Joe Rozario26-Nov-09 1:17

Joe Rozario

26-Nov-09 1:17

Thanks for your replay....

harold aptroot wrote:
or at least a sizable chunk

that's what i was trying ....

harold aptroot wrote:
surely you mean a long not a double

yes i was mistaken that is long

Thank you so much Smile | :)

by

joe

Re: what is the maximum size

Luc Pattyn26-Nov-09 1:13

Luc Pattyn

26-Nov-09 1:13

Hi,

AFAIK array sizes are limited to something like 2G-1.

However, assuming you only need part of the content of a binary (i.e. non-text) file, you can:
- get the File.Length, which is a long;
- get a stream for reading the file, with File.Open;
- seek a position in the file, say length-10, using FileStream.Seek;
- and read part of the file into an array, using FileStream.Read;
- finally close/dispose everything.

So for getting the end of the file, there is no need whatsoever to read everything!

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: what is the maximum size

Joe Rozario26-Nov-09 1:22

Joe Rozario

26-Nov-09 1:22

Thank you friend....

i was doing the same ....

thanks for the explantion ...

i did not notice that Seek position is (Long)

Luc Pattyn wrote:
seek a position in the file, say length-10, using FileStream.Seek

now my program works fine ... Smile | :)

by

joe

Export datagridview to excel file in Windows App.

mostafa_h25-Nov-09 18:45

mostafa_h

25-Nov-09 18:45

Hi All ,
In my datagridview , i imported an excel file to analyse it so filter and etc. . after that I want to export it to an Excel File using Save As Button in Windows Application . Plz help me how can do it ... ?
Regards

s_mostafa_h

Re: Export datagridview to excel file in Windows App.

Abhijit Jana25-Nov-09 18:52

Abhijit Jana

25-Nov-09 18:52

Here you Go
Export Gridview to Excel[^]

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.

Re: Export datagridview to excel file in Windows App.

mostafa_h25-Nov-09 22:31

mostafa_h

25-Nov-09 22:31

thanks,
this add all the contents of DatagriView , no the Header Text of column ,
....
RGDS !

s_mostafa_h

creating Generic Base Class Help

Lino Chacko25-Nov-09 18:37

Lino Chacko

25-Nov-09 18:37

hi...
i tried to create a generic base class. create Form1 as base class. Tried to access form1 from form2. there is no error on build. but i cant view the design part of Form2. Design part shows the error

"The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following classes in the file: Form2 --- The base class 'Test2.Form1' could not be loaded. Ensure the assembly has been referenced and that all projects have been built. Customer --- The base class 'System.Object' cannot be designed. "

source code is given bellow

public partial class Form1<T> : Form
{
public Form1()
{
InitializeComponent();
}
}

public partial class Form2 : Form1<Customer>
{
public Form2()
{
InitializeComponent();
}
}
public class Customer
{
private string customerName = string.Empty;
public string CustomerName
{
get { return customerName; }
set { customerName = value; }
}
}

please help me to solve this problem
---------------------------------------
Thanks in advance

Re: creating Generic Base Class Help

Mycroft Holmes25-Nov-09 21:06

Mycroft Holmes

25-Nov-09 21:06

Have you looked at an inherited form. Create you base form, compile your app. When you create your next form there is an option to create an inherited form and select the base form.

Read mpp file [modified] [Solved]

DJ24525-Nov-09 16:42

DJ245

25-Nov-09 16:42

hi all,

i am in need of reading tasks from an .mpp file. How can i find the parent task id of particular task while reading? Please help me..

Lal

modified on Thursday, November 26, 2009 12:18 AM

Re: Read mpp file

dan!sh 25-Nov-09 17:14

dan!sh

25-Nov-09 17:14

Interop provides classes and interfaces to read an MPP file. There you can create a Task object and check if it offers any property to do this.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Check Children in MDIParent

Socheat.Net25-Nov-09 16:15

Socheat.Net

25-Nov-09 16:15

Dear all,
Can you give me code that can find form in MDIParent?

Socheat

Re: Check Children in MDIParent

N a v a n e e t h25-Nov-09 16:34

N a v a n e e t h

25-Nov-09 16:34

Your question is not clear. Do you want to find a form that is child of a MDI form?

Best wishes,
Navaneeth

Re: Check Children in MDIParent

Socheat.Net25-Nov-09 17:08

Socheat.Net

25-Nov-09 17:08

Dear,
I want to find form child, if it not yet open, it will open

Socheat

Re: Check Children in MDIParent

N a v a n e e t h25-Nov-09 17:11

N a v a n e e t h

25-Nov-09 17:11

MdiChildren[^] should help.

Best wishes,
Navaneeth

Re: Check Children in MDIParent

dan!sh 25-Nov-09 16:58

dan!sh

25-Nov-09 16:58

MDIChildren property of the parent form would give an array of child forms. Is this what you are looking for?

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Re: Check Children in MDIParent

Socheat.Net25-Nov-09 17:17

Socheat.Net

25-Nov-09 17:17

Thank,
I got it

Socheat

Array Help

Joe Spaz25-Nov-09 14:06

Joe Spaz

25-Nov-09 14:06

This is the final code, i finally got the array in the label. Thanks

public partial class ShippingCosts : Form
{
   //array of zip codes and charges
   int[,] intZip = { {33620, 5}, {33619, 10}, {33618, 12}, {33617, 13}, {33616, 14}, {33611, 18}, {33602, 22},
{33600, 25}, {33254, 26}, {33628,30}};

   public ShippingCosts()
   {
      InitializeComponent();
   }

   //click event handler
   private void btnSubmit_Click(object sender, EventArgs e)
   {

     int intZipCode=Int32.Parse(txtZipCode.Text);

      //for statement to find zip code
     for (int intcounter =0; intcounter <intZip.GetUpperBound(0); intcounter++)

    {
        //if statement for what to do if matches or doesnt match
        if (intZipCode== intZip[intcounter,0])
        {
        lblResults.Text=Convert.ToString(intZip[intcounter,1]);
        return;
        }
        else
        {
        lblResults.Text = "We do not deliver to this address";

         }}
      //end if statement

modified on Wednesday, November 25, 2009 8:43 PM

Re: Array Help

Luc Pattyn25-Nov-09 14:29

Luc Pattyn

25-Nov-09 14:29

Hi,

I think it has to be Convert.ToString(intZip[intcounter,1]); to correspond to the conditional test on the line before it.

However there are better ways to do this:

1.
an array is fine when you know the number of elements in advance; otherwise you should use a list (good old ArrayList, or better yet the generic List<T> where T is some type).

2.
using a two-dimensional array like this is a little ugly. A clearer (but more expensive) way would be to create a class or struct that holds one ZIP code and one shipping quantity, then build a one-dimensional array or a generic list of such elements.

3.
and then, as you are interested in mapping one collection (ZIP codes) onto another collection (quantities), there is even better; have a look at the generic Dictionary<TKey,TValue> class. Using that, with its indexing capabilities and its Find methods, you could eliminate your for loop entirely.

4.
and finally some people will argue your data belongs in a database table, so you don't need a Dictionary, a simple SQL query would come up with the result.

PS: you have a strange return inside the if-else; I would expect both cases to be more similar, i.e. have
a return after the if-else (or none at all, if that's the end of the method).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Array Help

_Maxxx_25-Nov-09 14:33

_Maxxx_

25-Nov-09 14:33

your [0,1] should be [intCounter,1]

___________________________________________
.\\axxx
(That's an 'M')

Re: Array Help

Joe Spaz25-Nov-09 14:42

Joe Spaz

25-Nov-09 14:42

Thank you very much guys, i knew it was something really dumb like that but i really appreciate the explanations.

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