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Hi, all:
I am totally stuck, please help. I have a datagrid on the WinForm ( using C# ). I am trying to create a combobox for one of the columns. I use the technique described in MS KB Article 323167 ( coded in VB.NET) and I port the code to C#. It works fine for the existing rows. Whe I click on the * row ( i.e., try to create a new row) on the datagrid. The combobox seems there, but when I click on the down arrow, the combobox does not dropdown. Occasionally, I can get the dropdown, but when I leave the cell, the changed value goes to the previous row ( strange!). The primary key is AutoNumber, when I click on the new row ( with "*" in front of it), I sometime get little pencil in front of the row, but sometimes I do not get it except the autonumber ( almost like it does not treat as a new row ).
Has anyone use this combobox technique and work on the new row successfully? I include the code snippet ( handling the events) here, if you can spot anything I did wrong, please let me know.
Any help is highly appreciated. Thanks in advance.
Dion
************ Code Starts here ***********
private void dataGrid1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
{<br />
if ( dataGrid1.CurrentCell.ColumnNumber == 1 )<br />
{<br />
cbType.Width = dataGrid1.GetCurrentCellBounds().Width;<br />
}<br />
}<br />
<br />
private void dataGrid1_CurrentCellChanged(object sender, System.EventArgs e)<br />
{<br />
if ( dataGrid1.CurrentCell.ColumnNumber == 1 )<br />
{<br />
cbType.Visible = false;<br />
cbType.Width = 0;<br />
cbType.Left = dataGrid1.GetCurrentCellBounds().Left;<br />
cbType.Top = dataGrid1.GetCurrentCellBounds().Top;<br />
cbType.Text = dataGrid1[dataGrid1.CurrentCell].ToString() + "";<br />
cbType.Visible = true;<br />
}<br />
else<br />
{<br />
cbType.Visible = false;<br />
cbType.Width = 0;<br />
} <br />
}<br />
<br />
private void dataGrid1_Scroll(object sender, System.EventArgs e)<br />
{<br />
cbType.Visible = false;<br />
cbType.Width = 0;<br />
}<br />
<br />
<br />
private void dataGrid1_Click(object sender, System.EventArgs e)<br />
{<br />
cbType.Visible = false;<br />
cbType.Width = 0;<br />
}<br />
<br />
<br />
private void cbType_TextChanged(object sender, System.EventArgs e)<br />
{<br />
if ( dataGrid1.CurrentCell.ColumnNumber == 1 )<br />
{<br />
cbType.Visible = false;<br />
<br />
if ( ( dataGrid1[dataGrid1.CurrentCell] + "") == "" )<br />
{<br />
SendKeys.Send("*");<br />
}<br />
<br />
dataGrid1[dataGrid1.CurrentCell] = cbType.Text;<br />
} <br />
}
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Hi,
What do i need to develop win ce apps with .net??
is there some sdk for it? , is it even possible?
//Roger
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The compact framework (subset of the .NET SDK). Available as part of .NET 1.1 (still in beta[^]).
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excuse my ignorance now but , when that is installed , can i compile apps in vs.net to the 1.1 framework? do i need to point vs.net to where the new compiler is or?
i have no idea what im doing now ... totally confused 
//Roger
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Whatever VS.NET version, the .NET (standard or compact) version the compiler compiles and runs against is HARDCODED. So you must have the adequate environment :
If you are using VS.NET 2002, then you can separately download the compact framework. I don't have the link, but you probably can get it somewhere from the MS site (even though MS tends to push their 1.1 beta).
If you are using VS.NET 2003 beta, then you can download the 1.1 .NET framework (either run-time or SDK). What you download has both the standard and compact versions to play with.
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Is it possible to call a COM component in C# from a COM in MFC with in WinCE
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The only way I know of to develop CE apps in C# is using the VS.Net 2003 Beta, which includes a CE.Net emulator for testing of CE apps right on your development machine. Go to MSDN and look at the MSDN Show - they had an epsiode a couple of months back focussing on developing with the compact framework.
Although MS have publicly released the framework 1.1 beta (which contains the compact framework - aka CE.Net) AFAIK there is absolutely no way to use it with VS.Net 2002. If someone can would like to correct me on this, I would be glad to hear it.
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Hi every:
How can i use C# to call VC dll???
it's include a parameter type ---> Char
when i call this dll in C#
it's return value is error...
please help me~~~~~~~~
exam:
declare:
[DllImport("test.dll")]
public static extern int teststring([In,Out] string aa)
and call:
string aa=”HI! Nice to Meet You!”;
RetString = teststring(aa);
----------------------------------
becase in VC the dll's parameter is declare a Ascii Array
how i can do to trun vc's parameter(ascii array) to become
a string in C#.....
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try
<br />
[DllImport("test.dll", CharSet=CharSet.Ansi)]<br />
public static extern int teststring(string aa);<br />
If it doesn't work, don't hesitate to post the actual C/C++ function prototype.
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I did a few columns on this last fall. I'd suggest this one:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncscol/html/csharp09192002.asp
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I'm just starting out with C# and I'm following one of the Microsoft walkthroughs for creating a distributed application.
It involves IIS, SQL server and a windows client and a web client.
The windows client works fine, but the web client just times out so I was poking around trying to find out what's going on because there are no obvious problems (aka I don't know really what to look for  ).
Anyway, the question I have is when I switch to HTML view for my web form, the first line of xml code is highlighted in yellow, the line is (not broken in the original, just one line):
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebApplication1.WebForm1" %>
Is this to indicate an error or parsing problem of some kind or....?
The full code for the form is this:
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebApplication1.WebForm1" %><br />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><br />
<HTML><br />
<HEAD><br />
<title>WebForm1</title><br />
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0"><br />
<meta name="CODE_LANGUAGE" Content="C#"><br />
<meta name="vs_defaultClientScript" content="JavaScript"><br />
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"><br />
</HEAD><br />
<body MS_POSITIONING="GridLayout"><br />
<form id="Form1" method="post" runat="server"><br />
</form><br />
</body><br />
</HTML>
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It's 100% normal for it to be highlighted yellow. The yellow highlighted lines in asp.net pages are lines that specify the backend library for the page.
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Thank you Furty. That rules that out as pointing to the problem.
I guess I'm going to have to do some digging to figure out how to debug a web application.
Thanks again
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Hi there,
I just thought this information might be useful to u! Though from ur mail it sounded like u r just beginning ASP.NET, I would not try and offend u by giving some information that u already know! If it helps, GREAT!
Debugging a web Application fortunately is much better in VS.NET than it was in InterDEV with ASP.
A process named ASPNET_WP.exe runs on the machine within which your ASP.NET (C# or VB.NET) code is debuged.
If your solution contains several projects, just set up any of the desired projects as a Startup Project from the Context menu, and any of the aspx pages as the startup page.
If your machine's config is very good, you will go for this traditional debugging approach which is good too!
But, there is a better approach wherein, you just open any desired page in the Browser, and at any point of time Go into Debug mode by Attaching to the ASPNET_WP.exe process from Tools->Debug Processes menu option. just go ahead with the default options while doing this.
Hope htis helps a bit!
Atul kale
Sr. Software Engineer
XcelVision Technologies Ltd.
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Hi Atul, that information is extremely helpful, thank you very much!
Cheers!
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Hi David, I'm debugging remotely if you consider the computer sitting 6 inches to the left of my development system remote.
From what I understand (and have done) since reading Atul's message is that you can debug locally if you have installed VS.NET after you installed IIS etc as it adds debugging support, however, as in my case, you need to run the STEP 1 of the vs.net setup on the remote IIS server, then do STEP 2 of the VS.NET setup selecting only the server / remote debugging components which takes care of all that. (it's in the readme file for VS.NET installation).
(Although you may already know all this;))
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i have set up a new member of the RC2CryptoServiceProvider. im trying to enhance the security of my program further by generating a random saltbyte using the RNGCryptoServiceProvider class. it works fine to generate the random file in a byte using the following code :
byte[] random = new Byte[100];<br />
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();<br />
rng.GetBytes(random);
my question is...i can encrypt with this method and random salt bytes...but since they are random how can i call apon them when decrypting ? if you dont decrypt with the same bytes then you get a encryptiong "bad data" error. how can i safely get the bytes used for encrypting to my decryptiong method.
im trying my best to make a clear question out of this problem if it wasnt clear enough let me know and ill try to clearify.
thanks alot,
Jesse M
P.s furty i know you know the awnser...
The Code Project Is Your Friend...
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The simplest way would be to have a fixed salt byte array of course, however the next easiest option would be to write the salt bytes to your filestream when encrypting, and read them back when decrypting.
Encryption:
FileStream fs = File.Create(filename);<br />
byte[] salt = new byte[16];<br />
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();<br />
rng.GetBytes(salt);<br />
fs.Write(salt, 0, salt.Length)<br />
<br />
Decryption:
FileStream fs = File.OpenRead(filename);<br />
byte[] salt = new byte[16];<br />
fs.Read(salt, 0, salt.Length)<br />
<br />
While this is certainly not the best method of doing it, it will work fine. Ideally your salt bytes would also be encrypted, so as not to weaken the basic thing they're about. But then again, your IV should be unique and encrypted too, and you should be using a keyed checksum, and etc etc.. OK, I'll write an article and put together a wrapper for it all *when* I get a few hours free time.. For now this will get you by
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thanks alot for the help...i will use a filestream...write the salt bytes...then encrypt the salt bytes....so on so forth.....or i guess i could just make a dll to do it for my program too....
The Code Project Is Your Friend...
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How can Controls(Buttons, Panels, etc..) be passed by referenece without making an overload for each type of Control. When trying to pass a button control an error is recieved of :
cannot convert from 'ref System.Windows.Forms.Button' to 'ref System.Windows.Forms.Control'
Trying to cast this does not work, and as said before making an overload for each control type seems a little massive. Every control made after this will have to be added to the code and then recompiled.
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have you tried boxing the button to a control when you call the method?
MyMethod(ref (Control)myButton);
1001111111011101111100111100101011110011110100101110010011010010
Sonork | 100.21142 | TheEclypse
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There should be someother way of doing it(something seems to be wrong here, but I couldn't figure out), but did you try passing ref Object
Cheers,
Kannan
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Why why why? object is by ref all ready!
MyDUMeter: a .NET DUMeter clone
"Thats like saying "hahahaha he doesnt know the difference between a cyberneticradioactivenuclothermolopticdimswitch and a biocontainingspherogramotron", but with words you have really never heard of."
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