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I'm not sure I fully understand your problem. Btw look at MSDN
library: (ex: ComboBox.DataSource).
Using DataSource property to associate a collection to your ComboBox, you have both a "DisplayMember" property, and a "ValueMember" property. I think this will solve your problem.
Gilles
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Sorry, I didn't make myself very clear. Thank you for answering and I got confused about this for a long time.
But now my problem is: I want to connect a valuable and a combobox together. when the valuable changes, the selection of combobox changes too. on the other hand, when the selection of combobox change, this valuable will change too.
But I don't know how to do that in C#. Do you have any ideas about this one?
Thanks in advance.
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a value or a variable
ComboBox1 has its own items including ID which dictates COmboBox2
Table1
CustomerName
CustomerID
Table2
StoreName
StoreID
CustomerID
As you can see the relationship is a customer has 0 or many stores and a store must have 1 customer
ComboBox1.DataSource = Table["CUstomer"].DefaultView;
ComboBox1.DisplayMember = "Name";
ComboBox1.ValueMember = "ID";
ComboBox2.DataSource = Table["Stores"].DefaultView;
ComboBox2.DisplayMember = "Name";
ComboBox2.ValueMember = ComboBox1.SelectedValue;
try that out, when you change combo1 the combo2 is updated based on the relationshipID.
to make them change each other makes no sense really, its a circular relationship which would require for you to hand pick the relationships in which
you would sink the SelectedIndex_Changed event and make your changes there.
nick
I'm not an expert yet, but I play one at work. Yeah and here too.
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I wrote the code using DataBindings like that:
checkBox1.DataBindings.Add("Checked", MyClass, "bValue" );
"checkBox1.Checked" and MyClass.bValue were supposed to be changed whenever the other one was changed.
But, when I changed the value of check1.Checked, like this:
checkBox1.Checked = false;
MyClass.Value was not changed.
Can anyone tell me why?
Thanks in advance!
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what does more code look like?
I mean does your class have get and set accessors. dont use public fields because you need to validate the data. what if a null comes from a database or somewhere. your code will break.
nick
I'm not an expert yet, but I play one at work. Yeah and here too.
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I am trying to automate login to a site for a subsequent file upload. Even though I set the Content-Length header I keep getting the 411 (length required) response error.
I begin with an initial unauthorized request to a form-authenticated page.
I extract the session cookie from the response header and attach it to the next request I send by POST method, along with the required authentication info. The program halts as soon as I try to access the next response, referring to the abovementioned error code.
Please tell me what I'm missing...
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
using System;
using System.Net;
using System.Web;
using System.Text;
using System.IO;
public class Loader {
private HttpWebRequest request;
private HttpWebResponse response;
private CookieCollection cookies;
private string url = "http://www.somedomain.com/member/home.jsp";
private string logPath = @"c:\\loader\response.log";
/*-------------------------------------------------------------------------*/
public static void Main() {
Loader loader = new Loader();
loader.MakeInitRequest();
loader.SendAuthInfo();
} // end Main
/*-------------------------------------------------------------------------*/
public void MakeInitRequest() {
request = (HttpWebRequest) WebRequest.Create(url);
// Set the request's CookieContainer
request.CookieContainer = new CookieContainer();
response = (HttpWebResponse) request.GetResponse();
// Capture cookies from the initial response
cookies = response.Cookies;
// Log the response
this.LogResponse("\n\n************INITIAL RESPONSE:************\n\n");
response.Close();
} // end MakeInitRequest
/*-------------------------------------------------------------------------*/
public void SendAuthInfo() {
string username = "my_username";
string password = "my_password";
string postData = "j_username=" + HttpUtility.UrlEncode(username) +
"&j_password=" + HttpUtility.UrlEncode(password);
byte[] postDataBytes = Encoding.ASCII.GetBytes(postData);
request = (HttpWebRequest) WebRequest.Create(url);
// Set the cookies from the initial response to this request
if (cookies != null) {
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(cookies);
}
// Set the request headers
request.Method = "POST";
request.ContentType = "application-www-form-urlencoded";
request.ContentLength = postDataBytes.Length;
// Post authentication info
StreamWriter writer = new StreamWriter( request.GetRequestStream() );
writer.Write(postDataBytes);
// Log the response
response = (HttpWebResponse) request.GetResponse();
this.LogResponse("\n\n************NEXT RESPONSE************\n\n");
response.Close();
writer.Close();
} // end SendAuthInfo
/*-------------------------------------------------------------------------*/
private string DisplayResponseHeaders(WebHeaderCollection headers) {
StringBuilder buffer = new StringBuilder();
// Capture each header:value pair
foreach(string header in headers) {
buffer.Append(header + ": " + headers[header] + "\n");
}
return buffer.ToString();
} // end DisplayResponseHeaders
/*-------------------------------------------------------------------------*/
private void LogResponse(string title) {
FileStream fStream =
new FileStream(logPath, FileMode.Append, FileAccess.Write);
StreamWriter logWriter = new StreamWriter(fStream);
StreamReader reader = new StreamReader(response.GetResponseStream());
string responseString;
// Log the response
responseString =
this.DisplayResponseHeaders(response.Headers) +
reader.ReadToEnd();
logWriter.Write(title + responseString);
reader.Close();
logWriter.Close();
fStream.Close();
} // end LogResponse
/*-------------------------------------------------------------------------*/
} // end class Loader
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I have created a Database Object on a Remoting Server that is not disposing when the function call is returned? Why would this be happening?
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Yes how can i override the drawing inside the row header
nick
I'm not an expert yet, but I play one at work. Yeah and here too.
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Hi all.
I've searched through the forums but couldn't find an answer.
I have a rich text box (but the question stands even for "simple" text boxes),
and I would like to get the cursor's position within it.
Something like "line X column Y", or even just "char Z".
Any suggestions?
In particular, I'm trying to get to this info from the
handler of a mouse click event on the rich text box
--just in case the System.Windows.Forms.MouseEventArgs parameter can help
Thanks in advance,
F.O.R.
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Well, so far here's what I found... if anyone has any better idea, feel free to post 
<br />
<br />
int ndex = this.rBox_MarkedUp.GetCharIndexFromPosition(<br />
new System.Drawing.Point(e.X, e.Y));<br />
int line = this.rBox_MarkedUp.GetLineFromCharIndex(ndex);<br />
ndex is now the 0-based index of the char clicked
and
line is the number of the line (0-based as well).
We now return to the usual stream of questions
Thanks,
F.O.R.
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Hi.
I just went thru this as well, but this is what i worked out. it's basically the same thing you already figured out.
private void rtb1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)<br />
{<br />
leftMouse(e.X, e.Y);<br />
}<br />
<br />
private void leftMouse(int X, int Y)<br />
{<br />
posStart = rtb1.GetCharIndexFromPosition(new Point(X, Y));<br />
}
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Can you use functions like sprintf in c#??
If so, what namespace would you need to use them??
Because you can't do #include <stdio.h>
Or can you???!!!!????
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Why not just use String.Format?
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There is a nice section in the C Runtime Lib docs on MSDN that shows you exactly how the functions maps. Sorry no link.
leppie::AllocCPArticle("Zee blog");
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Hi !
I'm new to this whole .NET framework stuff. I want to implement "Office XP Task Panel" like functionality and
how to attached two windows.
Thanks & Regards
Sanjay Rastogi
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Dear sirs,
I would like to get more information about SingleCall servers like:
1- Is it possible to persist data in SingleCall server ? If so, how ?
2- Is it possible to keep a thread running indefinitly in a SingleCall
server ?
3- I need to develop a SingleCall server that keep several threads
running, to monitor something, like a Process Scheduler, for example.
My questions are:
- When (and where) do I need to start them ?
- When (and where) do I need to stop them ?
- How long will them still running ?
4- In a SingleCall server, is it possible to share data among server
calls using static variables ?
Thank you very much.
Marcos.
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Hi friends,
Is there any new class,namespace now available with C# to invoke win32 APIs like SendMessage?
VikramS
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You can easily declare Windows APIs in your code. For instance, SendMessage would be:
[DllImport("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
This article[^] has a large number of Win32 constants, functions, and structures declared.
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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I'm having a little difficulty with the set accessor. I'm working on a template-based site design and trying to use the set accessor to set the document's title. The problem is that it's not setting the title and I can't seem to figure out what I'm missing. Here's some sample code:
---
ControlBase.cs
---
public class ControlBase : System.Web.UI.UserControl
{
private string _strTitle;
public string Title
{
get
{
return _strTitle;
}
set
{
_strTitle = value;
}
}
}
---
Default.aspx
---
<%@ Page language="c#" Codebehind="Default.aspx.cs" AutoEventWireup="false"
Inherits="namespace.PageBase" %>
...
<title><asp:literal id="litTitle" runat="server"></asp:literal></title>
---
Default.aspx.cs
---
public class PageBase : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Literal litTitle;
private ControlBase _ctlContent;
private void Page_PreRender(object sender, System.EventArgs e)
{
if (_ctlContent.Title != string.Empty)
{
this.litTitle.Text = _ctlContent.Title;
}
}
}
---
Default.ascx.cs
---
public class Default : ControlBase
{
private void Page_Load(object sender, System.EventArgs e)
{
this.Title = "This should be the title of the document";
}
}
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your class is fine. its how your populating it freom the asp page is the problem.
nick
I'm not an expert yet, but I play one at work. Yeah and here too.
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Thanks for your reply. I solved my problem by adding an EventHandler for Page_PreRender to the PageBase class.
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Hi !
I'm new to this whole .NET framework stuff. Till now I was working with a team by some CAE projects. Our programs have been using binary files to store results and datas. So now I decided to write an implementation of reading these binary files in C#. In Delphi it look something like that:
- define a packed record
- write it to the stream with TStream.Write() method.
The TStream.Write() method took two arguments: one was a reference to a buffer and second was the buffer size.
As far as I can see there is no such possibility to read a whole bunch of data at-once like this. Can you please tell me how do I do that (write a bunch of data directly to the stream) using the .NET framework architecture ?
The goal is to create a next version of these apps that are taking advantages of the .NET framework and the C# programming language (which is btw really more readable than the Pascal syntax for me) but leaving the possibility to read old projects by new users.
Best regards - Matthias Hryniszak
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Doing so isn't very wise because it can easily break by the addition, removal, or changing of position of an element. Every C book I've read has also pointed out that doing so is a bad idea.
Because it is a bad idea (and generally mis-used) the framework doesn't support it in the form you are looking for. The alternative is to use the Serialization classes, but since you have an existing format to follow those won't work for you.
The next best thing is to just read the data in and interpret it as you go. I'm not aware of how Delphi/Pascal format binary data so I can't comment on any differences. But if memory serves Pascal uses length-prefixed strings instead of null-terminated strings. This could potentially be one problem you'll encounter.
I hope that gives you some direction on where you should go from here.
James
At Jethro Tull's August 28, 2003 concert Ian Anderson mentioned that the group would be performing a medley of title tracks. The songs were "Songs from the Wood", "Too Old to Rock and Roll; Too Young to Die"; and from the Heavy Horses album, "Stairway to Heaven"
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