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This is rarely a good idea. If the user control needs acces to a Form object, it should have a Form property OR extend the Form class.
Also when the user control is dropped onto a form (or other container) in the designer, a parameterless constructor is used/needed.
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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You can use the Parent property to access the container the user control is in - this may or may not be a form... it could be a groupbox, a panel etc, you can check by using is or as. If it's not a form, check the parent's parent etc etc...
This is normally the wrong way round of doing things though as you will effectively be coupling your user control to a form and if you want to manipulate other controls on the form then you will be coupling to those too. If your control is then used in a different container and/or the expected controls aren't present you will end up with problems. A better solution is to expose events, properties and methods in your user control that it's host form can access, then the host form can control all it's controls including your user control.
If you are wanting a 'controller' form with your user control acting as the controller - you would be better to create a custom form for this purpose rather than a user control IMO.
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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see i use this user control in FormA and when the project runs it gets any form name execpt itself(the form that has this user control) in textbox1 (this textbox1 is also in the user control)and then the user control brings out all control on that form and show all properties of that control.
I have used this code in User Control:
Type type = Type.GetType(txtFormName.Text, false, true);
Form frm = Activator.CreateInstance(type) as Form;
I get this error :
Value cannot be null.
Parameter name: type.
Alert :
This user control has been made in another project and i have build DLL and now I use this DLL in my another projects.
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Very good day all,
Is there a built in control & classes in C# allow me to draw a circle "dynamically"?
like the image in this link?
thank you!
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Yes there is, in a windows form app you can:
private void Form1_Load(object sender, EventArgs e)
{
Pen pen = new Pen(Color.Black, 3);
Graphics gfx = this.CreateGraphics();
gfx.DrawEllipse(pen, 20, 20, 50, 50);
}
That should get you on the right track 
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I made a slight mistake in my last reply, you should actually add the code to the form "paint" event:
private void Form1_Paint(object sender, PaintEventArgs e)
{
Pen pen = new Pen(Color.Black, 3);
Graphics gfx = this.CreateGraphics();
gfx.DrawEllipse(pen, 20, 20, 50, 50);
}
as the form "load" event doesnt apply graphical effects it just initialises its base values.
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Thanks , I have modfied that , it helps
now , the key thing how to create those node on to of them?
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A couple of points...
1. Your pen should be disposed (or better still enclosed in a using block.)
2. Any graphics object you create yourself should also be disposed (gfx)
2b. Creating grapics is 'expensive', there is already a Graphics object in e.
3. Better to override the OnPaint method.
3b. You should call the base's method at a suitable location.
so the code would become...
protected override void OnPaint(PaintEventArgs e)
{
using (Pen pen = new Pen(Color.Black, 3))
{
e.Graphics.DrawEllipse(pen, 20, 20, 50, 50);
}
base.OnPaint(e);
}
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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Hi Dave,
DaveyM69 wrote: You should call the base's method at a suitable location
Really? I never do that for Paint, and neither does this MSDN example[^].
So my questions are: why? what does it do for me? and if so, what is "a suitable location"?
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Because otherwise (if overriding OnPaint rather than handling the Paint event) the Paint event will not get raised. I normally do it at the end of the method i.e. after all painting, however if there is some custom action that needs doing after all paint handlers have finished then base.OnPaint(e) should be called before then.
Edit: I've just followed the link a reread your post - In my point before I had suggested overriding OnPaint rather than handling the Paint event which is where the confusion comes from!
I prefer to override OnPaint if painting as I can be sure that no subscribers to the Paint event will be called until I've done with painting. If I paint in the Paint event handler then other subscribers may already have been notified yet my painting hasn't even begun!
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)
modified on Saturday, January 2, 2010 9:32 AM
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hi......
i want to protect my application with licence key....in Xaml
can anyone help mee....
thanquuu...
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Its pretty simple, make some random characters using a random number generator and specify how many you want?
Random ran = new Random();
string mySerial = string.Empty;
int serialLength = 12;
for (int i = 0; i < serialLength;i++)
{
int ascii = ran.Next(70,90);
char myChar = (char)ascii;
mySerial += myChar.ToString();
}
A bit like that, next time lookup the problem.
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Why do you say you want it in XAML? XAML is a markup language - pure and simple.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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I have develop one window application in C#.Net. I want to create a trial version for 15 Days. How can I do.
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You can use preprocessors for example you could place this statement before your declare the namespaces:
#define TRIAL
using System..... ect
and in the form load event you could:
#if TRIAL
if (firstusedate.days < firstusedate.days + 15)
{
MessageBox.Show("Sorry trial expired");
System.Thread.Sleep(3000);
}
#endif
My answer is pretty vague but you should get the idea, feel free to ask if there is still some problems
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I don't think anyone is going to get the idea because what you propose only does anything at compile time. It doesn't protect the app at all.
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I see the app is not being built as a trial, but a dynamic trial based app.
...
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First When U installed Your Software you must have to insert the Date any where either in Database or Text File or System Registry. When Person Start The Software Check That and +15 and Current Date Of System When Your Insert
Date+15=CurrentDate The Close That Software or any Message trial Period of your Software is Over. Application.Exit(),Application.ExitThread().
Thanku Dinesh
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Hi,
I made one combobox which i canwrite some text, in C# and i build that as DLL.
And i call this to VC++.
My problem, when it is in C#,i can write text in combobox.
But in VC++,i cannot write.
When i press alphapets in keyboard nothing is displayed in combobox. only beep sound is coming.
Whats the mistake?
Anu
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I have made this small application that can write and read XML and I am new to XML parsing.
The following source is probably pretty bad so does anyone have some ideas to make it better for example, a better design strategy for it?
I would really like to follow a good conduct before I look further 
The main class (normal console application)
using System;
using System.Collections.Generic;
using System.Text;
namespace xml
{
class Program
{
static void Main(string[] args)
{
List<Product> list = new List<Product>()
{
new Product(0, "Xbox 360", ProductType.Electronic, 129.99m),
new Product(1,"Playstation 3",ProductType.Electronic,130.99m),
new Product(2,"Playmobile Tonka",ProductType.Toy,29.99m),
new Product(3,"Tennis rack",ProductType.Sports,50.99m)
};
XmlRules rules = new XmlRules();
rules.SortList(ref list, SortType.IDLowest);
Xml xml = new Xml();
xml.SaveProductAsXML(list);
xml.ReadXml();
list = null;
}
}
public class Product
{
public int ID { get; set; }
public string Name { get; set; }
public ProductType Type { get; set; }
public decimal Cost { get; set; }
public Product(int id, string name, ProductType type, decimal cost)
{
ID = id;
Name = name;
Type = type;
Cost = cost;
}
}
public enum ProductType
{
Electronic, Toy, Sports
}
}
An XML class that deals with saving and reading XML:
using System;
using System.IO;
using System.Collections.Generic;
using System.Xml;
namespace xml
{
class Xml
{
const string _FILE_NAME = "products.xml";
public void SaveProductAsXML(List<Product> list)
{
XmlDocument root = new XmlDocument();
XmlElement rootElement = root.CreateElement("Products");
root.AppendChild(rootElement);
for (int i = 0; i < list.Count; i++)
{
XmlElement elemnt = root.CreateElement("Product");
XmlAttribute att = root.CreateAttribute("Name");
att.Value = list[i].Name;
elemnt.Attributes.Append(att);
XmlAttribute idAttr = root.CreateAttribute("ID");
idAttr.Value = list[i].ID.ToString();
elemnt.Attributes.Append(idAttr);
XmlAttribute typeAttr = root.CreateAttribute("Type");
typeAttr.Value = list[i].Type.ToString();
elemnt.Attributes.Append(typeAttr);
XmlAttribute priceAttr = root.CreateAttribute("Price");
priceAttr.Value = string.Format("{0}", list[i].Cost);
elemnt.Attributes.Append(priceAttr);
rootElement.AppendChild(elemnt);
}
root.Save(_FILE_NAME);
root = null;
rootElement = null;
}
public void ReadXml()
{
using (FileStream file = File.OpenRead(_FILE_NAME))
{
XmlDocument document = new XmlDocument();
document.Load(file);
XmlNodeList nodeList = document.GetElementsByTagName("Product");
for (int i = 0; i < nodeList.Count; i++)
{
string name = nodeList[i].Attributes[0].InnerText;
string id = nodeList[i].Attributes[1].InnerText;
string type = nodeList[i].Attributes[2].InnerText;
string price = string.Format("{0:c}", decimal.Parse(nodeList[i].Attributes[3].InnerText));
Console.WriteLine("Name {0}", name);
Console.WriteLine("ID {0}", id);
Console.WriteLine("Type {0}", type);
Console.WriteLine("Price {0}", price);
Console.WriteLine();
}
}
Console.ReadKey();
}
}
}
And finally a class that stores the sorting rules for the XML document:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace xml
{
class XmlRules
{
public void SortList(ref List<Product> list, SortType sort)
{
IEnumerable<Product> products;
if (sort == SortType.PriceLowest || sort == SortType.PriceHighest)
{
products =
from p in list
orderby (sort == SortType.PriceHighest ? p.Cost * -1 : p.Cost)
select p;
list = products.ToList();
}
else if (sort == SortType.IDLowest || sort == SortType.IDHighest)
{
products =
from p in list
orderby (sort == SortType.IDHighest ? p.ID * -1 : p.ID)
select p;
list = products.ToList();
}
products = null;
}
}
public enum SortType
{
PriceLowest, PriceHighest, IDLowest, IDHighest
}
}
Thanks!
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If it works, I'd leave it alone and move on into the rest of the project.
Beyond that, I would make the method in XmlRules static so that you don't have to instantiate the class to use that method. (By the way, you neglected to take into account the sort direction.)
Second, I would use Linq-to_Xml to load/save the XML data from the disk file. It's much simpler.
.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001
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I have developed a windows app that will run on a local network. I have the app set so users can run the app from the server. What do I need to do so the user doesn't get the message: "The publisher could not be verified. Are you sure you want to run this software"
Thanks in advance!
sk
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Digital Signature -- see here: http://www.kinook.com/blog/?p=10[^]
--EricDV Sig---------
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them.
- Laurence J. Peters
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I assume you are using IE 7 or 8. Add your app to the browser's trusted sites list.
| There are only 10 types of people in this world — those who understand binary, and those who don't. |
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The Solution that i Provided U is For Win App.
1)First U Have to installed Your application on Server and The Folder Which is Created on Your Server Must Be Shared with Full Permission on That Folder.
2)Go To The Start->Run->Cmd->cd \->CD Windows (Enter)
CD \Microsoft .NET FramreWork 2.0 (Enter)
CD \Framework (Enter)
CD \v2.0.50727 (Enter)
C:\Windows\Microsoft .NET FramreWork 2.0\Framework \v2.0.50727(this you path)
after that you have to Write The command
caspol -cg 1.2 FullTrust (Case Senstitive)
Ask For Yes Or No Press Y
All This Work is Done At Server.
Now on Client
1)First Installed .NEt FrameWork 2.0 Setup
2)MYComputer Right Click MAP Driver From That Server on Your Client Computer
3)Repate The Setup Of Command on the Client as Above
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