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From inside class A, just instantiate B. From outside class A, you can instantiate A.B.
FYI, class B can access private members of class A, and instantiating class A does not instantiate class B.
You typically nest classes to either show dependency of the nested class on the outer class or to mark the nested class as private so that only the outer class can access it (it still needs a public or internal constructor, though).
Microsoft MVP, Visual C#
My Articles
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Consider the following code...
public class Outer
{
public Outer() { }
<br>
public class Inner
{
public Inner() { }
}
}
The Inner class can be accessed as follows...
Outer.Inner i = new Outer.Inner();
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A small annotation that doesn't deal with your question.
Instead of the public get- and set-methods, use properties to offer access to your private class members.
<br />
private string stra1;<br />
public string Stra1<br />
{<br />
get<br />
{<br />
return this.stra1;<br />
}<br />
set<br />
{<br />
this.stra1 = value;<br />
}<br />
}<br />
Afterwards you can access the property like a public variable.
<br />
A obj = new A();<br />
obj.Stra1 = "string";<br />
string x = obj.Stra1;
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Urgent.. need a sw that cuts video into images and compatible with .NET
or
access the video from the program using C#.net then convert the frames into images
count the frames in the video
set a index for each image
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Hi
Well, my question today is how I could use a dataset into a PivotTable??
I try to use a PivotTable v10 into my C# project, and I wanna bind it from a dataset, but I don't know how. The PivotTable just can be binded from a DataSource 
If someone work with PivotTable in C#, please help me.
Thanks
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hxxbin
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It must bind against an ADO data source, not an ADO.NET data source. In order to do this, you must import the ADO typelib. If you have installed VS.NET, it is recommended that you use the Primary Interop Assembly (PIA) created by Microsoft, adodb.dll. This is found by default in Program Files\Microsoft.NET\Primary Interop Assemblies.
You use ADO much like you use ADO.NET: you create connections and commands and execute that command to get back an ADO recordset, which you can then set as the PivotTable.DataSource property value.
Microsoft MVP, Visual C#
My Articles
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Thanks, I better try to use ADO  , I don't know how use PIA It's hard to use PIA??
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hxxbin
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Just add a reference to it and access the classes just like you do with any other assembly.
Microsoft MVP, Visual C#
My Articles
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Hey,
I need an example of an application written in C#, using Winforms, and especially separating the three classic layers (Data Access Layer, Business Logic layer, User Interface Layer)..
If you know any please send the link..
It would be of GREAT help to me..
Thank you!
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this is the code i used
PrintDocument pd=new PrintDocument();
pd.DefaultPageSettings.PaperSize= // don't know what to put here
chad
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Set it to a new instance of the PaperSize, like so:
PrintDocument pd = new PrintDocument();
pd.DefaultPageSettings.PaperSize = new PaperSize("Legal", 8500, 14000);You can also get supported paper sizes from the printer by getting the PrinterSettings in a number of ways and then enumerating through the PaperSizes collection property.
Microsoft MVP, Visual C#
My Articles
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ok here is my code listing but it dose not print on legal paper is sayes manual feed plain letter on my printer
public void printpages()
{
pages=cnt;
pd.PrintPage += new inting.PrintPageEventHandler .printDocument1_PrintPage);
pd.DocumentName = "Imaging";
pd.DefaultPageSettings.PaperSize = new PaperSize("Legal", 8500, 14000);
if (pd.PrinterSettings.IsValid)
{
pd.Print();
}
private void printDocument1_PrintPage(object sender,System.Drawing.Printing.PrintPageEventArgs e)
{
System.IO.FileStream fs ; //create a filestream to open the image
fs= new FileStream("c:\\temp\\test.tiff",System.IO.FileMode.Open,System.IO.FileAccess.Read);
Image newImage = Image.FromStream(fs);
Rectangle destRect = new Rectangle( 1, 1,1000,1000);
e.Graphics.DrawImage(newImage, destRect);
fs.Close();
}
chad
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Does your printer even support legal paper? As I mentioned before, get the PrinterSettings for your paper and enumerate the PaperSizes collection property.
Microsoft MVP, Visual C#
My Articles
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I'm still finding my feet in the new .NET world, wanting to learn the best practises rather than just using old C++ techniques.
I'm looking for the best way for displaying a list of data records and allow double-click to launch a seperate form, passing in the record that has been selected.
In MFC, I use a ListViewCtrl and fill it with data from a recordset.
What is the best way to do this in C#.
A data-bound ListView control seemed the best way, but that doesn't seem possible in C#. Or is the DataGrid the way it should be done in C#.
I only want to display the data in a columned list, with no editing - possibly may want to have a different background colour on individual rows.
Michael
But you know when the truth is told,
That you can get what you want or you can just get old,
Your're going to kick off before you even get halfway through.
When will you realise... Vienna waits for you? - "The Stranger," Billy Joel
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You can always data-bind the ListView though there are no properties or functionality to do this for you like there is for the DataGrid. You can make either one work, however.
With the DataGrid, you could handle the DoubleClick event. In that handler, get the CurrentRowIndex and use that to get the DataRow in your data source. If you bind against a DataView instead, be sure to get the DataRowView with that index in order to get the row. Then just invoke whatever action you want using the data from that row.
Microsoft MVP, Visual C#
My Articles
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Heath Stewart wrote:
You can always data-bind the ListView though there are no properties or functionality to do this for you like there is for the DataGrid. You can make either one work, however.
Thanks,
Being a lazy kind of guy, I've been looking for a ListView control that already has the data-binding code implemented. Beyond a VB.NET sample on MSDN (and a poor conversion to C# here at CP), I haven't found anything.
As you seem to be the oracle when it comes to all things C#, do you know of any code that already implements data-binding in a ListView.
I'm probably going to have to write it myself, but I can't believe nobody has done it already. (I'm equally surprised that MS didn't do it either)
Michael
But you know when the truth is told,
That you can get what you want or you can just get old,
Your're going to kick off before you even get halfway through.
When will you realise... Vienna waits for you? - "The Stranger," Billy Joel
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Microsoft is doing it for .NET 2.0. They're adding data-binding to the ListView (among other things, like virtual lists and grouping) and introducing an all-new control called the DataView, which is much more powerful and flexible than the DataGrid. In fact, IIRC, the DataGrid isn't even added to VS.NET 2005's toolbox by default.
There's no easy way to bind the ListView, but you can use the same tactics as the DataGrid. If the DataSource property you'd add to your own ListView derivative implements IListSource, you get the IList. If it implements IList, you simply use that. Then just enumerate that and do a little checking to see if you're enumerating simple objects or DataRows. You can use that to bind columns.
You could go a step further (albeit a pretty big step) and create your own column handlers that allow you to specify mapping names. The best way to see how this works is to use ildasm.exe from the .NET Framework SDK to see how the DataGrid works.
Consider this, though: after you've finished you're essentially created a DataGrid. You may as well use that until you can upgrade your codebase to .NET 2.0 which should go beta later this summer presumably since it's slated to be released in Q1 or Q2 of 2005.
Microsoft MVP, Visual C#
My Articles
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Heath Stewart wrote:
Consider this, though: after you've finished you're essentially created a DataGrid.
A very good point.
Thanks for your advice, very educational. I'll take the DataGrid route for now, it should do what I need.
Michael
But you know when the truth is told,
That you can get what you want or you can just get old,
Your're going to kick off before you even get halfway through.
When will you realise... Vienna waits for you? - "The Stranger," Billy Joel
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I have a client calling methods in a remote server object.
The client gets data, displays it to the user, and sends updates to the server via method calls.
I am now on 1.1 Framework AND I have implemented the TypeFilterLevel=Full
We can send atomic data to the server (bool, string, etc.) but when I send my collection (marked [Serializable]) back to the server, I get the infamous Security violation error. Since I've already deployed the documented fix, what is the next step? I should be able to pass this data back to the server??!!! 
______________________________
The Tao gave birth to machine language. Machine language gave birth to the assembler.
The assembler gave birth to the compiler. Now there are ten thousand languages.
Each language has its purpose, however humble. Each language expresses the Yin and Yang of software. Each language has its place within the Tao.
But do not program in COBOL if you can avoid it.
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Many developers have been trying to figure out a way to simulate VB6 style default property in C#.
I thought of using operator overloads first. Since assignment operator doesn't overload, I used implicit to type cast.
MyClass c="Test String";
Console.WriteLine(c);
It is implemented in the following class using implicit type casting operator
class MyClass{
public static implicit operator MyClass(string s) {<br />
MyClass c=new MyClass();<br />
c.Text=s;<br />
return c;<br />
}<br />
private string _Text;<br />
public string Text{<br />
get{return _Text; }<br />
set { _Text = value; }<br />
}<br />
public override string ToString() { return Text;}<br />
}
Does someone know a simpler way?
Fakher Halim
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That's really the only way to do it. There is no "default property" in the Common Type System (CTS), which defines how types and members are defined. So, since MyClass is not a String, you have to use an operator as you've done.
Frankly, I think the whole thing is silly. What's so hard about instantiating and assigning the Text property? Using the operator you incur one more call on the call stack.
Microsoft MVP, Visual C#
My Articles
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Those VB6 developers were INSISTING on not using MyClass.Text and just assigning MyClass directly with a string , as they would do in pre-.NET days
The classical example was a Label control, where both of following mean the same:
lblEnterName.Caption = "Enter full name"<br />
lblEnterName = "Enter full name"
Fakher Halim
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I understand what the intentions are, but this isn't VB6 - it's the .NET Framework. Change is inevitable.
Microsoft MVP, Visual C#
My Articles
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