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Wrap your insCommand.ExecuteNonQuery(); in a try/catch block and catch the SqlException that gets throw. What does that say?
- Nick Parker
My Blog
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Change this...
String strInsert = "insert into User(UserID,Password,UserType,"+
" FirstName,LastName,Age,Gender,Phone,Fax,Email,URL,"+
" Address,City,State,Country) values (@UserID," +
" @Password, @UserType, @FirstName, @LastName, @Age, " +
" @Gender, @Phone, @Fax, @Email, @URL, @Address, @City, @State," +
" @Country)";
Into this..
String strInsert = "insert into User(UserID,Password,UserType,"+
" FirstName,LastName,Age,Gender,Phone,Fax,Email,URL,"+
" Address,City,State,Country) values (?,?,?,?,?,?,?,?,?,?)";
But I'm not sure if this will work, because you are only passing 2 parameters. Do some test with only 2 paramaters... e.g.
String strInsert = "insert into User(UserID,Password) values ?,?)";
Free your mind...
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instead of insCommand.Connection.Open() use
myConnection.Open() and check whether all the server details are correct or not. then try to pass hardcoded values in the query instead of parameters. If it works fine then go to parameters
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Hi Everyone,
I have a problem with a set of components I am creating. Basically I have the following:
Menu : Component<br />
MenuItemCollection : CollectionBase<br />
MenuItem : Component
MenuItemCollectionDesigner
The Menu and MenuItems contain a MenuItemCollection with the following attributes against it
DesignerSerializationVisibility(DesignerSerializationVisibility.Content), Editor(typeof(Design.MenuItemCollectionDesigner), typeof(System.Drawing.Design.UITypeEditor))
The designer opens a new form which adds/removes the menu items into the menu/menuitem in a tree style ui.
The items get added ok and are correctly written the InitializeComponent function on the form. The first problem is the fact that the designer does not write out the AddRange call for each MenuItemCollection so the menu items never get added to the collection.
The second problem (the first problem also occured before I introduced this one!) I dont want the menu items to be visible at designtime in the pane on the bottom of the desiger so I added:
[DesignTimeVisible(false), ToolboxItem(false)]
I cant figure out how to delete the items from the code when the parent menu is removed?
I have googled till my fingers bleed, I have seen other peoples similar problems but not really any answer to whats going on with the AddRange method.
One thing I did notice - I Have a custom grid with a custom column collection, the AddRange member for that also stopped working, it did work at 1 point during development, but now both controls dont write out the AddRagne command.
Can anyone help me?
Thanks - James
James Simpson
Web Developer
imebgo@hotmail.com
P S - This is what part of the alphabet would look like if Q and R were eliminated
Mitch Hedberg
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As far as removing all the child components recursively when their parent is removed, get the IComponentChangeService service in your designer and handle the ComponentRemoving or ComponentRemoved event. You can recurse through your children and remove them. The designer should reflect this automatically.
As far as adding the components, use a good disassembler (like ildasm.exe that comes with the .NET Framework SDK) or a good decompiler like .NET Reflector[^] and perhaps take a look at how the existing Microsoft.VisualStudio.WindowsForms.MenuDesigner, Microsoft.VisualStudio designer does it.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----
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Thanks for the reply.
I am downloading the .NET Reflector for a bit of research - thanks for the link.
The other two problems are now sorted.
1) Everything was working fine apart from the fact I was missing the Add call to the collection myself. I was just adding the new component into the Container collection thinking that was sufficient - Doh!
2) I just did a recursive dispose on the Diposing function on the Component and cleared the collections at the end and that solved that one.
Thanks - James
James Simpson
Web Developer
imebgo@hotmail.com
P S - This is what part of the alphabet would look like if Q and R were eliminated
Mitch Hedberg
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Hi,
im loosing my hair over this .
if i have a typed dataset with the follwoing tables:
Customer ,Order ,OrderDetails
(northwind db)
and then i add relations to those tables in the dataset designer.
so far so good.
if i then fill each table with a dataadapter everything works fine to.
BUT
if i now only want to fill the "Order" table i get an error complaining that there are constraints problems.
isnt it possible to fill a typed datatable that has parent relations w/o getting this error?
i have solved this in a somewhat dirty way , i remove the parent constraint via code.
is this the only way to do it ??
i find it very strange that i cant just fill a table with the data in the database w/o loading the parent rows first!
//Roger
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This is exactly the way it should be.
Either the typed dataset has, or it hasn't got a constraint. And all the data in that dataset must comply to the constraints that are set on the dataset...
Have a look at my latest article about Object Prevalence with Bamboo Prevalence.
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If you've established a relationship between Customer and Order tables, this adds a relational-integrity constraint such that the Order table has a foreign key relationship with Customers; therefore, you cannot have a key in the Orders table that does not correspond to a primary key in your Customers table.
As far as programmatically removing the relationship or constraint, you could either do that (not much choice! ) or have two strongly-typed DataSet classes. We usually take the latter approach in our app I designed at work. Just makes things easier in the long-run and doesn't add too much bloat to your app/library.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----
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I have created a dll in VC++ for customizing a dialog, and now I want to use this from my C# app. But I keep getting an error telling me that an entrypoint can't be found. So I guess I missed out on something when creating my native dll.
What I've done is simply create a new Win32 Dynamic-Link-Library project(MyDll.dll)
This adds the __declspec(dllexport) before the functions.
Then I build my project and copy the dll file into the working directory of my C# project.
The C# code for calling the dll function looks like this:
[DllImport("MyDll.dll")]
public static int sum(int x, int y);
So can anyone help me with why the entrypoint can't be found? Is there more to creating a native dll than this?
I really can't find any useful information for solving this anywhere (at least not useful to me...)
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You can specify the entry point of your code within the DllImport attribute (Specifying an Entry Point[^]), also you need to identify your DllImport attribute with extern.
[DllImport("MyDll.dll", <code>EntryPoint="Sum"</code>)]
public static <code>extern</code> int sum(int x, int y);
- Nick Parker
My Blog
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why not create a managed C++ layer directly in the dll? 
leppie::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.
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Nick is write that you should include the extern keyword in the P/Invoked method declaration:
[DllImport("MyDll.dll")]
public static extern int sum(int x, int y);Also make sure that MyDll.dll is in a directory in the PATH environment variable or the application directory so that it can be found. Examples of such directories are C:\Windows, C:\Windows\System32, etc.
I just wanted to add that you can use depends.exe to make sure your functions are exported as you think they should be. Depends is a great Platform SDK tool and, if you choose the default options when installing VS.NET, should be installed. Just run the "Visual Studio .NET Command Prompt" in your VS.NET programs group off the start menu, cd' to the directory with your native DLL, and type "depends.exe MyDll.dll". If you've added the Platform SDK's bin directory to your system or user PATH environment variable (I like to manage all my PATH, INCLUDE, and LIB directories like this), you can just type "depends" in your Start->Run prompt and load your DLL. That will show you your exports.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----
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Ok, thanks for the advice. so i checked the exported functions with the depends.exe tool, and they seem kind of odd...
the name of my sum(int, int) function is not sum, but rather appears as :
?sum@@YAHHH@Z
in the list over exported functions. No wonder the entry point can't be found I guess...
Do you have any idea what might cause this?
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That's what happens when the function is not declared as a C-style function. The best way to declare the function is like so:
#ifdef _cplusplus
extern "C" {
#endif
INT __declspec(dllexport) sum(INT, INT);
#ifdef _cplusplus
}
#endif
INT __declspec(dllexport) sum(INT a, INT b)
{
return a + b;
}extern "C" declares the functions in the scope with C linkage and the functions won't be decorated. __declspec(dllexport) is a MS calling convention that exports the functions, thus eliminating the need for a .dep file. If you don't use this calling convention, you will have to use a .dep file.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----
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I want to test my web service so I locate it in other computer(with IIS installed and .NET framework),and then create virtual directory in IIS for it and give read and browse directory permission,But when I run a test client and call the web service I HTTP error 405(Method not allowed) ,when I browse the WB from IE the test page does not appear and only a tag appear which say:
<%WebService Language=C# Code-Behind=.....>
Any idea?
Mazy
No sig. available now.
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Sounds like the mappings for ASP.NET files are setup. Run "aspnet_regiis.exe -i" on the machine with ASP.NET installed using the framework you want to easily setup the appropriate mappings (like .aspx, .asmx, etc.). Run "aspnet_regiis.exe -?" for more information.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----
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I want to test distributed application on local machine Before deploying the application
What is the tools that can simulate distributed enviroment ?
And is Microsoft Application Center Test can help in that?
Thanks in advance
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Yes, ACT is for such a purpose. You can also throw together a simple client that spawns several threads all chattering with the distributed app. That's pretty much what all load-testing tools do. If you need to simulate different clients (ex, with different IPs) that gets a little more difficult but not impossible.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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Thanks Heath
one more question
in your experience is the test result accurate?
in the case the test scenario related to the real environment
or i need to test again on real environment
thanks in advance
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I'm sorry, but I couldn't tell you. I haven't had the opportunity to test it. I can tell you that lots of people use it, which wouldn't be the case if it were too bad.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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thanks heath
i moved toward distributed application so you may find
me ask many qoustion about this topic
so any suggestion will be appreciated
thanks agai
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Hi everyone
I have a problem when i try to read from database. the exception message says
Unspecified error: E_FAL_(0x80004005)
any one can help me?
The code is included in this file
the source code is also here
-----------------------------------------
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.OleDb;
namespace blood
{
///
/// Summary description for Form1.
///
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Panel panel1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.PictureBox pictureBox1;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.Button button1;
private System.Data.OleDb.OleDbCommand oleDbCommand1;
private System.Data.OleDb.OleDbConnection oleDbConnection1;
///
/// Required designer variable.
///
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.panel1 = new System.Windows.Forms.Panel();
this.label2 = new System.Windows.Forms.Label();
this.pictureBox1 = new System.Windows.Forms.PictureBox();
this.label3 = new System.Windows.Forms.Label();
this.label4 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.textBox2 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.oleDbCommand1 = new System.Data.OleDb.OleDbCommand();
this.oleDbConnection1 = new System.Data.OleDb.OleDbConnection();
this.panel1.SuspendLayout();
this.SuspendLayout();
//
// panel1
//
this.panel1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
this.panel1.Controls.AddRange(new System.Windows.Forms.Control[] {
this.pictureBox1,
this.label2});
this.panel1.Dock = System.Windows.Forms.DockStyle.Top;
this.panel1.Name = "panel1";
this.panel1.Size = new System.Drawing.Size(424, 64);
this.panel1.TabIndex = 0;
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(225, 24);
this.label2.Name = "label2";
this.label2.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
this.label2.Size = new System.Drawing.Size(174, 13);
this.label2.TabIndex = 1;
this.label2.Text = "ÇáÑÌÇÁ ßÊÇÈÉ ßáãÉ ÇÓã ÇáãÓÊÎÏã æ ßáãÉ ÇáãÑæÑ";
//
// pictureBox1
//
this.pictureBox1.Image = ((System.Drawing.Bitmap)(resources.GetObject("pictureBox1.Image")));
this.pictureBox1.Location = new System.Drawing.Point(16, 8);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(48, 48);
this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
this.pictureBox1.TabIndex = 2;
this.pictureBox1.TabStop = false;
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(283, 105);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(54, 13);
this.label3.TabIndex = 1;
this.label3.Text = "ÇÓã ÇáãÓÊÎÏã";
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(289, 145);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(48, 13);
this.label4.TabIndex = 2;
this.label4.Text = "ßáãÉ ÇáãÑæÑ";
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(64, 101);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(200, 20);
this.textBox1.TabIndex = 3;
this.textBox1.Text = "";
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(63, 141);
this.textBox2.Name = "textBox2";
this.textBox2.PasswordChar = '*';
this.textBox2.Size = new System.Drawing.Size(200, 20);
this.textBox2.TabIndex = 4;
this.textBox2.Text = "";
//
// button1
//
this.button1.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
this.button1.Location = new System.Drawing.Point(272, 189);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(80, 24);
this.button1.TabIndex = 5;
this.button1.Text = "ÏÎæá";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// oleDbCommand1
//
this.oleDbCommand1.CommandText = "SELECT id, name, [password] FROM names WHERE (id = ?) AND ([password] = ?)";
this.oleDbCommand1.Connection = this.oleDbConnection1;
this.oleDbCommand1.Parameters.Add(new System.Data.OleDb.OleDbParameter("id", System.Data.OleDb.OleDbType.VarWChar, 15, "id"));
this.oleDbCommand1.Parameters.Add(new System.Data.OleDb.OleDbParameter("password", System.Data.OleDb.OleDbType.VarWChar, 15, "password"));
//
// oleDbConnection1
//
this.oleDbConnection1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=muneer.mdb;Persist Security Info=Fal" +
"se;\0";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(424, 230);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.button1,
this.textBox2,
this.textBox1,
this.label4,
this.label3,
this.panel1});
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
this.MaximizeBox = false;
this.Name = "Form1";
this.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "ÏÎæá";
this.panel1.ResumeLayout(false);
this.ResumeLayout(false);
}
#endregion
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void button1_Click(object sender, System.EventArgs e)
{
string sql = "SELECT id, name, [password] FROM names WHERE (id ='"+textBox1.Text+"') AND ([password] ='"+textBox2.Text+"')";
try
{
OleDbDataReader objReader;
//oleDbCommand1.Parameters["id"].Value = textBox1.Text.Trim();
//oleDbCommand1.Parameters["password"].Value = textBox2.Text.Trim();
oleDbConnection1.Open ();
oleDbCommand1.CommandText = sql;
objReader = oleDbCommand1.ExecuteReader();
if(objReader.Read())
{
//ss = objReader["name"].ToString();
objReader.Close();
this.Close();
}
}
catch(ArgumentNullException ex)
{
MessageBox.Show(this,"Error 4"+ex.Message,"Error...");
}
catch(Exception ex)
{
MessageBox.Show(this,"Error 3 "+" \n"+ex.Message,"Error...");
}
finally
{
oleDbConnection1.Close();
}
}
}
}
-----------------------------------------
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Hi, my slave-working  is making a irc plugin for my c# program in vb...i want to embed the dll in my project so others can't ripoff the component from the program folder...
Is their any way to achieve this?...or perhaps some way to compile two differant projects with two differant languages together resulting in one exe?
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