Re: Different type of class Instantiation - C# 3.5 - C# Discussion Boards

PIEBALDconsult26-Nov-07 9:13

26-Nov-07 9:13

The biggest problem with that is that the value passed in may match more than one key's pattern even though the patterns are unique. You'll need to decide what to do in those cases. Iteration will be required.

unknown sign

ghanavat25-Nov-07 23:26

ghanavat

25-Nov-07 23:26

hi guys

what is this operator " {0} "? Confused | :confused:

such as:

Console.WriteLine("Property Value: {0}", ///);

saeed ghanavat

Re: unknown sign

N a v a n e e t h25-Nov-07 23:30

N a v a n e e t h

25-Nov-07 23:30

saeed470 wrote:
what is this operator " {0} "?

This can be replaced by the object specified.

string str = "test";
int a = 10;
Console.WriteLine("{0}{1}",str,a) //This will print "test10"

If you are using this, you can avoid casting the object to string explicitly.

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form cast

md_refay25-Nov-07 22:56

md_refay

25-Nov-07 22:56

i have menu in my application and i need to create general form object that can be converted to type of the active form to execute some void in active form so i need to convert (frm) which is form to customized form like employeeform and so on
thanks

md_refay

Re: form cast

NanaAM26-Nov-07 0:18

NanaAM

26-Nov-07 0:18

What is the question?

Nana

Different type of class Instantiation - C# 3.5

N a v a n e e t h25-Nov-07 22:46

N a v a n e e t h

25-Nov-07 22:46

Hi,

I was doing some experiments with C# 3.5 and I got the following code which is very tough to digest for me. Could anyone help me to understand this ?

class MySimpleClass
{
    private string _Property1 = string.Empty;
    private string _Property2 = string.Empty;

    public string Property1
    {
        get { return _Property1; }
        set { _Property1 = value; }
    }

    public string Property2
    {
        get { return _Property2; }
        set { _Property2 = value; }
    }
}

Following is the code where above class instance are kept in a List<>

List<MySimpleClass> objList = new List<MySimpleClass>{
            new MySimpleClass{Property1="Hello",Property2="Hello1"}
        };

How such type of invoking is possible ? I checked with the overloaded constructors for List class. But I couldn't find any matching methods there. I tried removing the instance creating of MySimpleclass. Then it shows error no overload method matches the parameter. From this I guess when we specify in the above format, automatically it is calling the Add() method specified in the List. How this happening, since no overloaded constructor takes MySimpleclass as parameter ?

Any ideas ?

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Re: Different type of class Instantiation - C# 3.5

darkelv25-Nov-07 23:03

darkelv

25-Nov-07 23:03

Maybe this blog will help. (at the object initializer part)

Click Here^

Re: Different type of class Instantiation - C# 3.5

N a v a n e e t h25-Nov-07 23:15

N a v a n e e t h

25-Nov-07 23:15

Thanks for the link. That explains the syntax well. But still I am not getting how the call is going to Add() method ? Let me try with creating a custom collection and adding items. Thanks again

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Re: Different type of class Instantiation - C# 3.5

N a v a n e e t h25-Nov-07 23:50

N a v a n e e t h

25-Nov-07 23:50

Yes I found it. If any class which implements IList, and initialize like the above sample, it will call Add() method by default. Cool | :cool:

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how to show image in ListView ColumnHeader

VenkataRamana.Gali25-Nov-07 22:30

VenkataRamana.Gali

25-Nov-07 22:30

hi,

i am working on 2.0 winforms.

any plz tell me how to show an icon or image in ListView ColumnHeader.

thanks

Ramana

Re: how to show image in ListView ColumnHeader

TJoe26-Nov-07 2:07

TJoe

26-Nov-07 2:07

Check this[^] out.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

enable the menus

keyto25-Nov-07 22:27

keyto

25-Nov-07 22:27

I have created a MDI form and is has menus like file edit etc. On file menu I have login sub menu. I initially disable all the menus except file. With click on login sub menu login form open and user can put user name and passowrd. The question is if that password is correct I need to enable the menus. How is it possible ? please help me.

keyto

Re: enable the menus

Pete O'Hanlon25-Nov-07 23:48

Pete O'Hanlon

25-Nov-07 23:48

This[^] article might help you. It does something very similar, so should serve as a good start.

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how to ZIP and UNZIP in C#

E_Gold25-Nov-07 22:19

E_Gold

25-Nov-07 22:19

hi how can i zip and unzip file in C# code ?

thank's

Re: how to ZIP and UNZIP in C#

VenkataRamana.Gali25-Nov-07 22:37

VenkataRamana.Gali

25-Nov-07 22:37

depend onthe zipping/unzipping tool.
use System.Diagnostics.Process class,
through Process class execute the zipping executable with command line parameters.
convert zipped/unzipped files to the stream & write into the hard disk?

go it?

Ramana

Re: how to ZIP and UNZIP in C#

Martin#25-Nov-07 22:55

Martin#

25-Nov-07 22:55

Hello,

You could use "SharpZibLib", which is a part of the free "SharpDevelop" project!
Can be downloaded (with examples) here![^]

All the best,

Martin

Re: how to ZIP and UNZIP in C#

Sandeep Kumar25-Nov-07 23:38

Sandeep Kumar

25-Nov-07 23:38

Hi.....

By using GZipStream class you can compress and decompress the file.....

GZipStream Example Link[^]

Regards,
Sandeep Kumar.V

Updating multiple base data

Nitin.raj25-Nov-07 22:13

Nitin.raj

25-Nov-07 22:13

hi,

I have fetched two database tables "MTQABenchMarks" and "Users" in the datagridview. This is a windows application. Now I have to update the "MTQABenchMark" database after making changes to the datatable present in the application. When I run the code it is throwing an exception "Dynamic SQL generation is not supported against multiple base tables." How to solve this. the code is

public Form1()
{
InitializeComponent();
}
static SqlConnection Con = new SqlConnection("Data Source= 192.168.100.234; Initial Catalog=gishyd; User ID=sa; password=gis*2005");

SqlDataAdapter Da = new SqlDataAdapter("SELECT dbo.Users.UserID, dbo.MTQABenchMark.Id as EmpID, dbo.Users.FirstName + ' ' + dbo.Users.LastName AS Name, dbo.MTQABenchMark.NoofMinPerDay,dbo.MTQABenchMark.PerMonth FROM dbo.Users INNER JOIN dbo.MTQABenchMark ON dbo.Users.UserID = dbo.MTQABenchMark.EID ", Con);
DataSet Ds = new DataSet();

private void Form1_Load(object sender, EventArgs e)
{
Da.Fill(Ds, "MTQABenchMark");
dataGridView1.DataSource = Ds.Tables["MTQABenchMark"];
}

private void button2_Click(object sender, EventArgs e)
{
SqlCommandBuilder CmdBld = new SqlCommandBuilder(Da);

Da.InsertCommand = CmdBld.GetInsertCommand();
Da.Update(Ds, "MTQABenchMark");

MessageBox.Show(" Database is Updated");
}

}
}

Please Help.

Nitin Raj Bidkikar

Nitin Raj Bidkikar

Re: Updating multiple base data

Aftab Sindhi26-Nov-07 5:07

Aftab Sindhi

26-Nov-07 5:07

You have 2 options.
1. Don't use INNER JOIN in your query. Get both tables separately and make relation between them at .NET level. Here you can select like a INNER JOIN only related records in both tables.
2. Don't generate and get INSERT or UPDATE command from Command Builder. Build manually INSERT or UPDATE commands for the ADAPTER.

For more information on these approaches GOOGLE.

Regards

Windows service

dan!sh 25-Nov-07 22:03

dan!sh

25-Nov-07 22:03

Hi
I am trying to write a windows services(first time).
I want it to write the name of each file opened in a notepad document.
I have written some code for it and I do have a service now which makes entry in the event log whenever it is started or stopped.
From where can I get a code understand what should be done next?
I dont want exact code; just a help to understand services

Chaos, panic and disorder - my work here is done.

Re: Windows service

schoetbi26-Nov-07 10:35

schoetbi

26-Nov-07 10:35

look here: C-Sharpcorner.com

how i can connect useres to the databas [modified]

yemen_programmer25-Nov-07 21:41

yemen_programmer

25-Nov-07 21:41

hello every one ,
i create user in sqlserver and when i create form in c# contain the username and password . i can't connect the user to data base .
how i can mack this .the spicifec preoplem in connection and compare user name and password
alhemyary

-- modified at 3:54 Monday 26th November, 2007

Re: how i can connect useres to the databas

Pete O'Hanlon25-Nov-07 21:49

Pete O'Hanlon

25-Nov-07 21:49

Could you be a bit more specific? Which area is causing you the problem? The connection string? The stored procedure?

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Re: how i can connect useres to the databas

Christian Graus25-Nov-07 21:49

Christian Graus

25-Nov-07 21:49

Well, you need to fix your code. Do you mean you have a login with SQL Server that goes in your connection string, or a table with usernames and passwords which the user needs to use to use your application ?

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Dropdownlist

minniemooo25-Nov-07 21:07

minniemooo

25-Nov-07 21:07

How do I populate my dropdownlist with data from SQL?

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