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Has a 'dataGrid1' and assign to 'dataTable1', 'dataTable1' have 3 columns: Col1,Col2,Col3, and then:
Col1.ColumnName = "Col1";
Col2.ColumnName = "Col2";
Col3.ColumnName = "Col3";
Col1.DataType = System.Decimal;
Col2.DataType = System.Int32;
Col3.DataType = System.Decimal;
Col3.Expression = "Col1 * Col2";
Col3.ReadOnly = true; // it's auto set
Why at runtime, edit Col1, Col2 of the 'dataTable1' and then leave to other row, but Col3's value has not change yet, has not any be computed？
Additional:
I had try to new a 'dataRow1', and then give value to dataRow1[0], dataRow1[1], and at last 'Add()' this row in 'dataTable1'. At this time, run dataTable1.Refresh() and found that 'Col3' shown correct. Why at this time the Expression could be used.
 
Why learn more, unaware more?
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hi to all,
does any one knows how to use graphical control in a c# win application.
i have an interface that display a planning of an employe and i want to do that graphically.
does any one knows if such control exist in c# ?
if not does someone have any suggestions ?
best regards and thanks in advance
fady
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All controls in c# inherit System.Windows.Forms.Control.
You can create such a control that draws a specific thing when you call the procedures you add to it. The question is how to draw onto the control? The answer is the System.Drawing.Graphics Class. Get the associated Graphics to you control with CreateGraphics and do your drawing, the control changes it's (visual) contnents afther a refresh.
I hope you understand...because is a rough world out there...
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Dear All,
I've one code which will convert an XML file to a MailMessage object. Now I want to save it to local disk as .MSG or .EML file. How can i do this?
Does any body know it?
Jayant D. Kulkarni
Brainbench Certified Software Engineer in C#, ASP.NET, .NET Framework and ADO.NET
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i have downloaded new Message from outlook into my local folder i have problem in displaying it in winforms(C#)
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There is string in the statement.
For example, SQL statement in C#.
strSQL="Select * "
" from TB1";
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strSQL="Select * " +
" from TB1";
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Another way is
strSQL="Select * ";
strSQL+=" from TB1";
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strSQL = @"Select *
from TB1";
works as well. It's useful for putting long formatted strings in code.
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Hallo comunity,
i create litle tool with Visual Studio .Net 2005 and with Framework 2.0 Beta and it works good, but is a beta version of framework!, but not all of systems have a Framework version 2.0, most of them have a 1.1 framework version, can i make a configuration witch framework to use when my tool is installed, or when i compile the aplication they should use the 1.1 framwork and not the 2.0, so i can install the application on everey system with 1.1 framwork, i have 3 versions of Framework, 1.0 , 1.1 and 2.0???? Maybe in a Solutionsettings or preferences or properties???
thanx for help!
mirso
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You can specify the version of the runtime required by your application in configration file in requiredRuntime element you can specify which versions of the common language runtime that your application supports in supportedRuntime
elment look at startup Element[^]
requiredRuntime Element[^]
supportedRuntime Elemnent[^]
MCAD
-- modified at 9:17 Friday 2nd September, 2005
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Hallo mcad,
thax for help, i have do this!
mirsad
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and this solved the problem or what?
MCAD
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i ansver later, i dont have yet testing the application!
that what i make:
<br />
<configuration><br />
<startup><br />
<supportedRuntime version="v1.0.3705" /><br />
<supportedRuntime version="v1.1.4322" /><br />
<supportedRuntime version="v2.0.50215" /><br />
</startup><br />
</configuration><br />
I take all 3 Framework versions to support my application, i message you the result!
mirsad
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hallo comunity,
my idea dont work now, hmm, this configuration file dont take result by the installation, the installer search framework 2.0 again, i should insert a
required tag element maybe in the configuration file, like this:
<requiredRuntime version="v1.1.4322" safemode="true">
maybe works now!? any idea for me?
regards
mirso
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hi,
this dont work with this statement in the confiturations file, the installer takes only the framework 2.0!?
I think that my config file is wrong kreatet!!! Witch name must have a configuration file for an projekt, and i have 5 projekts included in my projekt solution!! and in every project him own config file! is that right???
regards
mirso
-- modified at 6:57 Monday 5th September, 2005
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I'm importing a COM interface definition into C#, and I came across a method that has a parameter:
[out, iid_is(riid)] void **ppvInterface
This parameter is used to pass a COM interface reference out to the caller, which in this case will be managed code. The use of void**, is, I believe, due to the fact that the interface reference passed to the caller may be either IDispatch or IUnknown.
I know how to deal with cases where the base interface (between the two) that the interface is derived from is known - make the argument be of type object, and then add a MarshalAs attribute, specifying either UnmanagedType.IUnknown or UnmanagedType.IDispatch. But what should be done when the interface could be derived from either one?
TIA!
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Recently I design a custom comboBox control,this control includes two forms.The one of the forms is inherit from the namespace that System.Windows.Forms.ComboBox,When active DropDownEvent,The second form will be shown.But the focus is moved on the new form.
However,I want keep the focus still on the main form.
Will you help me,please? Thanks.
MSN:tomatoboy78@hotmail.com ，you can email to me.;)
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From what I understand you have two forms : a mainForm, and a "dropDownForm". When you press the drop down button you wish to show the dropDownForm but keep focus on the mainForm. If you do that the dropDownForm will not be visible (only if you make it allways on top, whitch is not a good thing, let's say you switch to an other aplication...in this case you will see the dropDownForm). I recommend you to forward all the focus actions you wish to keep onto the mainForm from the dropDownForm.
I hope you understand...because is a rough world out there...
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Is there anyone can help???
I am trying to get and set the content of some page items those have
a particular associated xml element. And this is what I tried:
InDesign.Application indesign;
Type t = Type.GetTypeFromProgID("InDesign.Application", true);
indesign = (InDesign.Application)Activator.CreateInstance(t);
InDesign.Document doc = indesign.ActiveDocument;
InDesign.PageItems items = doc.PageItems;
System.Collections.IEnumerator enu = items.GetEnumerator();
while (enu.MoveNext())
{
// this is ok, giving System.__ComObject
// which is useless information
MessageBox.Show(enu.Current.ToString());
// but this is not, giving InvalidCastException
// What object type is it meant to be ????
PageItem i = (PageItem)enu.Current;
MessageBox.Show(i.Id.ToString());
}
I also tried doc.AllPageItems, but it gave me the same exception.
Thank you for any help.
Ha
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I have Visual C++ lib file, but I also want to use C# to write my program. How can i do? Can I use Visual C++ *.lib into C#?
Second problem:
Is it same the writen methods with Visual C++.NET & Visual C++?
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Nop, you can't use .lib on c#, but, you can use Interop and call functions in a DLL.
Second, Visual C++.Net can compile projects made with Visual C++, but Visual C++.Net can compile managed C++ programs also.
Eduardo Diaz
site | english blog | spanish blog
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The best you can do is to write a mixed-mode wrapper around the classes in the library and then use that wrapper from C#.
uumeme wrote:
Is it same the writen methods with Visual C++.NET & Visual C++?
No, VC++ .NET generates IL, VC++ code is compiled to machine code.
Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro
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Hi All,
I Have two RichTexBoxes on a form vertically one above the other.
Now i want to draw a rectangle on the Richtextbox like we draw in MS-WORD.
This rectangle should allow the user to enter text within it.
and if the rectangle is dragged by holding one of it's end the size of the rectangle should increase. if the size of the rectangle increases more than the Richtextbox's size the rectangle should be continued on the next Richtextbox.
What i want to achieve is the same that we do in MS-WORD.
I dont know whether it is possible or not.
Please help me out,
Waiting for reply
Rgards,
Pramod
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