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Hi,
Is it possible to create user-defined controls (.ascx file) and use them in windows applications. If so can anyone provide links, resources.
Thanks and Rgds,
PLS
Long Live
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No. You can create user defined controls, but they can't be ascx files, they need to be winforms controls.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Hi,
Thanks Christian Graus.
Long Live
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Hello I am new to this forum... I have a quick question... well I've created a Address Book, basically as my first program that I want to show my family.. On the first form it is all textboxes, datatimepicker, and a picturebox.
You click the menu to open the DataGrid form I created.. in this I have a DataGridView. I have two problems. The DataGridView is always missing the first row of data. ID is the primary key and auto increments. It is always missing the first one... Also how do I get the table to display the image they chose with the person they added? I have the column as a image column but it will not display. The Picturebox is in the database. Here is how they load the picture:
try
{
DialogResult result = new DialogResult();
OpenFileDialog openfile = new OpenFileDialog();
result = openfile.ShowDialog();
if (result == DialogResult.Cancel)
{
return;
}
else
{
picturePictureBox.Image = Image.FromFile(openfile.FileName);
}
}
catch (Exception ex)
{
toolStripStatusLabel1.Text = ex.Message;
}
One --> how come the datagridview is missing a row all the time?
two --> how do I get the picture to display in the datagridview?
I will be adding something where they can print the information in this format:
FirstName LastNAme
Address
City, State Zip
Home Phone, Cell Phone, Fax
I will get to this later, I am goign to try to figure that one out myself, but with the datagridview and the picture I have been messing with for a while and can just not figure it out.. Thanks
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Hi,
two --> how do I get the picture to display in the datagridview?
maybe this can help you
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TextBox get focus always, like msn messager's input-box.
How to do?
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Probably call SetFocus each time the textbox is no longer in focus.
"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus
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Hi,
My C# code calls to bunch of external methods exported from gdi32.dll
That’s example of the code we use to export the methods from the dll:
[DllImport("gdi32.dll")]<br />
internal static extern int ExtEscape(HDC hDC, <br />
int nEscape, <br />
int inputSize,<br />
ref CWDDECMD InputData, <br />
int outputSize, <br />
ref CIWSINFO OutputData);<br />
<br />
<br />
…<br />
[DllImport("gdi32.dll")]<br />
internal static extern int ExtEscape(HDC hDC, <br />
int nEscape,<br />
int inputSize,<br />
ref CWDDECMD InputData,<br />
int outputSize,<br />
ref CIOVLTHEATERMODE OutputData);
There are over two hundred of method declarations and they are different only by type of parameters (ie CIWSINFO versus CIOVLTHEATERMODE in this examle).
The methods are called from all around the code.
Now I have to come with design that allows tracing calls to the methods
While printing the name of the method and type and values of passed parameters (this part is simple as each passed type implements ToString method).
I just hate idea of duplicating each declaration with the method that performs tracing before calling to real method:
[DllImport("gdi32.dll")]<br />
internal static extern int ExtEscape(…);<br />
<br />
static int ExtEscapeTrace (…)<br />
{<br />
DoTrace ();<br />
ExtEscape (…) ;
}
To bad the methods are static; otherwise I would be able to use proxies.
Any ideas?
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Hi,
I am trying to get status text of the browser using following code but for some reason I am not getting any values back. Any idea why?
// both lines doesn't work
string result = webBrowser1.Status.Text;
string result = webBrowser1.Document.Window.StatusBarText;
Thanks
A.Asif
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I've been using the WMI code generator to get my start, but I'm having trouble figuring out how to implement WMI in C# on my own.
I've figured out that what I'll probably do to check who is logged on the computer remotly is use:
-Win32_Process, filter where name='explorer.exe'
And then:
-GetOwner
to throw back the username.
Are u familiar on how to implement WMI in C#? I could really use a hand.
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try this. I got the code snippet from the code generator itself. However, makesure you know which Win32_Process.Handle you want t10execute GetOwner on. In the code snippet its tied to 1076.
using System;
using System.Management;
using System.Windows.Forms;
namespace WMISample
{
public class CallWMIMethod
{
public static void Main()
{
try
{
ManagementObject classInstance =
new ManagementObject("root\\CIMV2",
"Win32_Process.Handle='1076'",
null);
// no method in-parameters to define
// Execute the method and obtain the return values.
ManagementBaseObject outParams =
classInstance.InvokeMethod("GetOwner", null, null);
// List outParams
Console.WriteLine("Out parameters:");
Console.WriteLine("Domain: " + outParams["Domain"]);
Console.WriteLine("ReturnValue: " + outParams["ReturnValue"]);
Console.WriteLine("User: " + outParams["User"]);
}
catch(ManagementException err)
{
MessageBox.Show("An error occurred while trying to execute the WMI method: " + err.Message);
}
}
}
}
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I want to user only enter integer for the employeeID property but when i enter alpha-numeric the messagebox appears twice. I want to display once what's wrong.
[TypeConverter(typeof(TypeConverters.MyIntConverter)),Browsable(true)]
public int EmployeeID
{
get { return _empID; }
set { _empID = value; }
}
=========MyIntConverter Class==============================
public class MyIntConverter : System.ComponentModel.Int32Converter
{
public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string)
{
try
{
return int.Parse(value.ToString());
}
catch(Exception)
{
MessageBox.Show("Invalid Number");
return 0;
}
}
return base.ConvertFrom(context, culture, value);
}
}
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This code will only show one, so it must be getting called twice. Try setting a breakpoint and checking the call stack to see why it's called twice.
Also, if you're going to use a value, use as instead of is, it's more efficient. And I'd recommend int.TryParse instead of a try/catch.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I feel like pulling my hairs have already spent 2 hours... I have only one propertyGrid on a form and even test on a brand new project still am getting the Messagebox twice. What i notice is that somehow it's coming twice in the Catch block. I do'nt know where else to dig.
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Look at the call stack to see who is calling the method each time. One of the callers is presumably unintentional.
Sounds like somebody's got a case of the Mondays
-Jeff
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What i have discovered is that when the when the debugger hits to the MessageBox.Show inside the catch block it goes back to the start of the function and then start all over again. I couldn't figure out why is it behaving like this. If i remove the MessageBox.show then it works fine but i want to display my customize error message.
Line 24 is where my MessageBox.show is defined
========Below are the call stack i got==================
myHelp.exe!TypeConverters.MyIntConverter.ConvertFrom(System.ComponentModel.ITypeDescriptorContext context = {System.Windows.Forms.PropertyGridInternal.PropertyDescriptorGridEntry EmployeeID}, System.Globalization.CultureInfo culture = {en-US}, object value = "9s") Line 33 C#
[External Code]
myHelp.exe!TypeConverters.MyIntConverter.ConvertFrom(System.ComponentModel.ITypeDescriptorContext context = {System.Windows.Forms.PropertyGridInternal.PropertyDescriptorGridEntry EmployeeID}, System.Globalization.CultureInfo culture = {en-US}, object value = "9s") Line 24 + 0xb bytes C#
[External Code]
myHelp.exe!TypeConverters.MyIntConverter.ConvertFrom(System.ComponentModel.ITypeDescriptorContext context = {System.Windows.Forms.PropertyGridInternal.PropertyDescriptorGridEntry EmployeeID}, System.Globalization.CultureInfo culture = {en-US}, object value = "9s") Line 24 + 0xb bytes C#
[External Code]
myHelp.exe!myHelp.Program.Main() Line 17 + 0x1a bytes C#
[External Code]
I get this message when i do MessageBox.Show(e.StackTrace.Tostring());
at System.Number.StringToNumber(String str,NumberStyles options, NumberBuffer& number,
NumberFormatInfo info, Boolean ParseDecimal at System.Number.ParseInt32(string s,
NumberStyles style, NumberFormatInfo info) at System.Int32.Parse(string)
at TypeConverters.MyIntConverter.ConvertFrom(ITypeDescriptorContext context,
CultureInfo culture, Object value) in Document\Project\MyIntConverter.cs line 20
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I'm guessing you have more than one event handler calling the method.
At any rate, consider using a NumericUpDown rather than a TextBox, or write a KeyPress event handler to ignore characters you don't want.
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Hi,
To investigate your issue, I tried your TypeConverter with my product, Smart PropertyGrid.Net. I also got the form twice and this is for this reason: the grid reacts to validation with the Enter key and also to the loss of focus. When Enter is pressed, your ConvertFrom method is called and the dialog box is displayed. Because the grid does not expect any UI to be shown at that moment, it also reacts to the loss of focus and tries to validate again the new value. Therefore, the ConvertFrom is called again and the form is displayed a second time. It won't happen indefinitely since at this time, the focus has been definitely lost.
I guess that the MS PropertyGrid acts in the same way. By showing a message box, you are going against the way it's supposed to work. No UI should be displayed by a TypeConverter whose goal is just to convert. If it fails to convert a value, it's supposed to throw an exception and the grid will show it. Smart PropertyGrid has of course more flexible mechanisms to validate and show errors.
Anyway, in SPG, I was able to stop this problem by defining a static bool isInsideConvertFrom. This way I was able to stop reentrant calls. Even if I think you should not show a UI from your converter, you can try this technique with the MS grid. Maybe it will work. However, I think your grid won't gain the focus back when the message box is closed. But this is to be tested.
Best regards,
Nicolas Cadilhac @ VisualHint
Smart PropertyGrid.Net
Microsoft PropertyGrid Resource List
Free PropertyGrid for MFC
Smart FieldPackEditor.Net / DateTimePicker
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Hi,
i would connect on a sqlserver, i use :
string strConnexion = "Data Source=localhost; Integrated Security=SSPI;" + "Initial Catalog=Northwind";<br />
try <br />
{<br />
SqlConnection oConnection = new SqlConnection(strConnexion);<br />
oConnection.Open();<br />
MessageBox.Show("Etat de la connexion : " + Connection.State);<br />
oConnection.Close(); <br />
} <br />
catch (Exception e) <br />
{ } <br />
but they are an exception,i use sqlexpress,
Thank you verry mutch.
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post the exception you get.
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J4amieC wrote: post the exception you get.
Look at the code:
catch (Exception e)
{ }
He is using the anti-pattern known as "try-catch-ignore" 
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This is the usual connection string I use for SQL Express.
Server=[MachineName]\SQLEXPRESS;Database=[DbName];Trusted_Connection=yes;
Need a C# Consultant? I'm available.
Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
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