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The best way to handle this problem and doing it safely is to create a delegate in the Parent, create an Event in the child, and subscribe the delegate to the event. Then when your child sees that the event for opening the second child occurs, you raise the event and pass the necessary information to be passed to the second child in the event args.
...parent...
MyChild child;
...
if (child != null)
{
child = new MyChild();
child.SomeEvent += new EventHandler(myDelegateMethod);
child.MdiParent = this;
child.Show();
}
else
child.Focus();
...
private void myDelegateMethod(object sender, MyEventArgs e)
{
INewChild something;
if (e.RequestedForm == "Calculate")
something = new Calculate(e.Args);
else
something = new SomethingElse(e.Args);
something.MdiParent = this;
something.Show();
}
...
public class MyEventArgs:System.EventArgs
...
______________________________
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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Is string a primitive type or is it not?
I read in Jeffrey Richter's "Applied Microsoft .NET Framework" that string (and decimal too) should be primitive types but than I tried following lines of code:
<br />
string s="";<br />
Console.WriteLine (s.GetType().IsPrimitive.ToString());<br />
It prints false!!
Do I make something false, or does anybody have an explanation for that??
mfg
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System.String is a class.
AFAIK the pseudo-primitive type string is only a shortcut for System.String.
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Yes, I know. int is also just a shortcut for System.Int32.
What I'm wondering about is, that Mr. Richter writes in his book, that string is a Primitive type and the command returns false at this method call. It also does with decimal datatype (decimal is no class), but it does not with int.
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Thanks!! Good explanation 
It says that string is no primitive type.
But another question:
This discussion also says that only on primitive types consts could be defined; but I am also able to define a string const with the following statement:
private const string cMYCONST = "asdfjkl";
???? 
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As was already proven about that author, not everyone is as right as they claim to be. Whoever said that is wrong.
You can declare anything as a const that can take a literal value, such as strings and other "primative" types (value types) that don't require explicit instantiation. These are your numeric types, bool, string, and enums.
Microsoft MVP, Visual C#
My Articles
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Thanks for the answer. I think I understand now a little more about those value/reference types...
Heath Stewart wrote:
As was already proven about that author, not everyone is as right as they claim to be. Whoever said that is wrong.
What do you mean with it, does Jeffrey Richter have more mistakes in his articels than it seem to be there??
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Actually, I was referring to the comment in the discussion someone linked that said that only "primatives" could be declared as consts. The fact that Jeffrey Richter said that String was a primative (and I'm taking your word for it) would be incorrect, yes. The Framework supports that by what you saw (which, BTW, you don't need to use Boolean.ToString in Console.WriteLine, since it formats every argument - regardless of type - as a string anyway; see my article, Custom String Formatting in .NET[^] for a brief discussion, though the article's not about that so much).
Microsoft MVP, Visual C#
My Articles
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I would say string is primitive as it is directly supported in the CLR. Decimal on the hand, is not.
top secret
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Hi all...
I just back to my machine today morning after Easter vacation. Have gone thru all comments. Frankly, as of now, I don't have that much in depth idea about it to say something authentically. Thanks very much for all valuable inputs so that I can consider those to identify the truth.
rgds...mil10.
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Hi everybody,
I visited a website about 4 or 6 months ago that was presenting a component for either .NET or COM that allowed to write Excel files programatically (not just automation, it was standalone: no need for Excel). I remember the component was quite cheap (or free, unsure) and not from one of the big component makers out there. It was pretty much one guy writing this component and sharing with others.
The problem is, I can't find the website anymore, nor do I remember the name of the thing. I bookmarked it but I deleted all my bookmarks about a month ago because I never used them (duh!)
Anyone knows what I'm talking about and can point me to the right direction? Google and Groups.Google didn't help.
Thanks a lot!
Carl
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Try http://www.fpoint.com[^]. This is Farpoint Technologies, makers of Spread for COM and .NET, one of the best Excel-like controls that's been around for quite a while. It can open and write XLS files and handy many of Excel's embedded functions (like SUM, AVG, etc.). Many of the same features are supported, and it is relatively cheap (Spread for Windows Forms is $799).
Microsoft MVP, Visual C#
My Articles
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I'm sure their component is nice, but at $800, it is really not in my budget.
The thing I'm looking for was either free or under $100... I don't remember exactly.
Thanks
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It was easy to find this[^] after a quick search on the usual sites.
Microsoft MVP, Visual C#
My Articles
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You may also want to have a look at XlsGen[^]. The price for a license starts around $10 USD.
--Jesse
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GREAT!!!!!!!! That's the one I was looking for! I knew some CPIANs were smarter than me and didn't delete their bookmarks 
Thanks again, this really helps!
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Is there a c# version of this: http://www.codeproject.com/shell/shellextguide1.asp ?
Is it possible to do it in c#? Can anyone point me to a tutorial or even just briefly explain how to do it?
Thanks
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<br />
[StructLayout(LayoutKind.Sequential)]<br />
public class SHITEMID<br />
{<br />
int cb;<br />
byte [] abID;<br />
}<br />
<br />
[StructLayout(LayoutKind.Sequential)]<br />
public class LPITEMIDLIST<br />
{<br />
SHITEMID mkId;<br />
}<br />
<br />
[StructLayout(LayoutKind.Sequential)]<br />
public class LPCMINVOKECOMMANDINFO<br />
{ <br />
int cbSize; <br />
int fMask; <br />
IntPtr hwnd; <br />
[MarshalAs(UnmanagedType.LPStr)]<br />
string lpVerb; <br />
[MarshalAs(UnmanagedType.LPStr)]<br />
string lpParameters; <br />
[MarshalAs(UnmanagedType.LPStr)]<br />
string lpDirectory; <br />
int nShow; <br />
int dwHotKey; <br />
IntPtr hIcon; <br />
} <br />
<br />
[ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("000214E8-0000-0000-C000-000000000046")]<br />
public interface IShellExtInit <br />
{<br />
[PreserveSig()]<br />
int Initialize(<br />
LPITEMIDLIST pidlFolder,<br />
IDataObject pdtobj,<br />
IntPtr hkeyProgId<br />
);<br />
}<br />
<br />
[ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("000214E4-0000-0000-C000-000000000046")]<br />
public interface IContextMenu<br />
{<br />
[PreserveSig()]<br />
int GetCommandString(<br />
out int idCmd,<br />
int uFlags,<br />
out int pwReserved,<br />
[MarshalAs(UnmanagedType.LPStr)]<br />
string pszName,<br />
int cchMax<br />
);<br />
<br />
[PreserveSig()]<br />
int InvokeCommand(<br />
LPCMINVOKECOMMANDINFO pici<br />
);<br />
<br />
[PreserveSig()]<br />
int QueryContextMenu(<br />
IntPtr hmenu,<br />
int indexMenu,<br />
int idCmdFirst,<br />
int idCmdLast,<br />
int uFlags<br />
);<br />
}<br />
<br />
[Guid("30DA4710-4D8A-4753-981A-9D20D5790356"), ComVisible(true)]<br />
public class MyShellExt : IShellExtInit, IContextMenu<br />
{<br />
public MyShellExt()<br />
{<br />
}<br />
#region IShellExtInit Members<br />
<br />
public int Initialize(LPITEMIDLIST pidlFolder, IDataObject pdtobj, IntPtr hkeyProgId)<br />
{<br />
return 0;<br />
}<br />
<br />
#endregion<br />
<br />
#region IContextMenu Members<br />
<br />
public int GetCommandString(out int idCmd, int uFlags, out int pwReserved, string pszName, int cchMax)<br />
{<br />
idCmd = 0;<br />
pwReserved = 0;<br />
return 0;<br />
}<br />
<br />
public int InvokeCommand(LPCMINVOKECOMMANDINFO pici)<br />
{<br />
return 0;<br />
}<br />
<br />
public int QueryContextMenu(IntPtr hmenu, int indexMenu, int idCmdFirst, int idCmdLast, int uFlags)<br />
{<br />
return null;<br />
}<br />
<br />
#endregion<br />
}<br />
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In an old project we are using the Crystal report viewer (CrystalDecisions.Windows.Forms) which was orginally version 9.1.5000.0 but we have updated to version 10 now.
If I look at the properties of this referenced assembly within Visual Studio .NET it shows version 10.0.3300.0 but when we build the app and look at the assembly information on the .exe file it still shows version 9.1 begin referenced.
How to update the assembly reference?
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Rebuild your project or solution. This will clean intermediate files and rebuild the entire project or solution.
Microsoft MVP, Visual C#
My Articles
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Hi,
Can somebody please tell me how to use the "Item" property in System.Collections.SortedList class. I wanted to get and set the value field depending on the key.
Thanks
Raj
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If you look at the documentation for the Items property, it says that it's the indexer in C# (the same as other lists' Items properties). This means you use it like this:
myList[key] = value;
value = myList[key]; You can use a key because a SortedList implement IDictionary, an interface for key/value collections. Mosts lists in the .NET FCL simply take an index (0-based, as with all .NET languages) in their indexer.
Microsoft MVP, Visual C#
My Articles
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Thanks for your reply. I am new to .Net. Trying to understand these properties. DO I have to override this property.
I am doing like this, but it doesn't work. In my Sorted list keys are of type string and value is of type int.
public override int Item(string myKey)
{
get
{
return mySrotedList[myKey];
}
set
{
mySortedList[myKey] = value;
}
}
Thanks for your help and time.
Raj
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