C# Discussion Boards - CodeProject

Re: Single instance of a form

Curtis Schlak.14-Dec-05 7:18

Curtis Schlak.

14-Dec-05 7:18

Hey, sorry about that. Change the body of the FlagAsNotLoaded method to

m_InitializedForms.Remove( formType.Name );

Sorry, was removing on the Type and not the Type.Name.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Re: Single instance of a form

Curtis Schlak.14-Dec-05 7:25

Curtis Schlak.

14-Dec-05 7:25

Now that I think about your solution, you may want to change all the references to formType.Name to one of two things: formType.FullName or formType. Two instances of different classes can have the same formType.Name and exist in the same project. If I include the two form classes Project1.CurtisAwesomeForm and Project2.CurtisAwesomeForm, then they will both have the same Type.Names but different Type.FullNames and their Types will not equate, either.

Just my two cents. <smile />

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Re: Single instance of a form

PHDENG8114-Dec-05 8:16

PHDENG81

14-Dec-05 8:16

You have a been a huge help. Thanks a lot. It is good to see that there are still people out there willing to help without makeing such a fuss if there is a loss of understanding.

Re: Single instance of a form

Curtis Schlak.14-Dec-05 10:40

Curtis Schlak.

14-Dec-05 10:40

No problem, amigo.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Re: Single instance of a form

PHDENG8119-Dec-05 2:27

PHDENG81

19-Dec-05 2:27

Curtis,

I am trying to control the number of instances of each form as well. So, working off of the previous code, I added this:

public static void LoadFormType(Type formType, Form parentForm, int instances)

{
lock( typeof( FormLoader ) )
{
if( eh == null )
{
eh = new EventHandler( FormClosed );
}
}
if( IsAlreadyLoaded( formType ) )
{
Form f = GetForm( formType );
f.Focus();
f.BringToFront();
return;
}

Form frm = (Form)Activator.CreateInstance(formType);
FlagAsLoaded( formType, frm, instances );//

DictionaryEntry[] myArr = new DictionaryEntry[m_InitializedForms.Count];//added
m_InitializedForms.CopyTo( myArr, 0 );//added

if(myArr[m_InitializedForms[formType.FullName]].Value <= instances)//added, clearly the cast types are wrong, but you get the idea
{
frm.Closed += eh;
frm.Show();
}
}

private static void FlagAsLoaded( Type formType, Form f, int instances )//
{
m_InitializedForms[formType.FullName] = f;
m_InitializedForms.Add(f, instances);//added

}

Then I would load a form as such:

FormLoader.LoadFormType(typeof(Form2), this, 1);

"1" indicating how many instances of the form should be allowed.

Thanks again for your help.

-- modified at 8:31 Monday 19th December, 2005

Wrapper for BITS

oddstar14-Dec-05 4:24

oddstar

14-Dec-05 4:24

I have just found out about the BITS protocol and think it would be perfect for the project I'm working on (an application that uploads large amounts of data to a server). The problem is that there doesn't seem to exist an BITS API for C#, just for C++. Has anyone created a wrapper for C#? If not, do you think it's difficult to do?

/Tubby

Re: Wrapper for BITS

WillemM14-Dec-05 9:27

WillemM

14-Dec-05 9:27

You could make a managed C++ wrapper around the original C++ code. This shouldn't be very hard to do, but you need to know some C++ to get it done Smile | :)

WM.

What about weapons of mass-construction?

which textbox is entered?

melanieab14-Dec-05 4:04

melanieab

14-Dec-05 4:04

Hi,
I'm trying to use the same event for different textboxes - the only difference being the textbox name.
Is there a way to determine which textbox the mouse has entered in a MouseEnter event, and then be able to do things with it like

Graphics g = txtBox.CreateGraphics();<br />
SizeF size = g.MeasureString(txtBox.Text,fontsmal);

?
Thanks so much again!!!
Mel

Re: which textbox is entered?

J4amieC14-Dec-05 4:21

J4amieC

14-Dec-05 4:21

Yes, the sender paarameter in the event handler is the textbox that sent the event

private void AllTextBoxes_MouseEnter(object sender, MouseEventArgs e)
{
   TextBox tb = sender as textBox;
   if(tb != null)
   {
       // A textbox raised this event
   }
}

Re: which textbox is entered?

melanieab14-Dec-05 5:03

melanieab

14-Dec-05 5:03

Awesome. Thanks!

Re: which textbox is entered?

anandss14-Dec-05 11:11

anandss

14-Dec-05 11:11

The first argument to MouseEnter event "(object sender, EventArgs e)", sender is the control that triggered that event.

Problem in gridview(asp.net (C#))

montu337714-Dec-05 3:56

montu3377

14-Dec-05 3:56

Hi guys,

I am facing problem with Gridview of Vs 2005 (in C#).
let me explain you whole.

I simply want to edit the gridview.I want to edit one selected row and into particular row exact column,but problem is that i m getting old values of that field like in orderqty field i want to change the No of order from 4 to 6 but when i am tring to retrive the value of that field it's giving me old value 4 instead of 6.
i had bound the gridview as same as we are generally binding with datagrid.
so can anybody help me out?

thanks

regards,
Montu3377

TopMost property c# win forms

fady_sayegh14-Dec-05 3:37

fady_sayegh

14-Dec-05 3:37

hi to all,

i need to define a form that will alyaws be on top of all other forms in my application.

i did that by setting the property TopMost = true.

the problem is that when i go into another win application (windows explorer for example) my form is still on top.

does someone knows how to define the form as a TopMost form but only for the c# application.

best regards and thanks in advance

fady

Re: TopMost property c# win forms

xtroll14-Dec-05 4:53

xtroll

14-Dec-05 4:53

Hi,

You can try YourFormObject.BringToFront(). It will leave your form on top over all other forms of your application but you can access to another application without problems.

I hope that helps you. Big Grin | :-D

X-TroLL

Combobox

SpeBeeTo14-Dec-05 2:57

SpeBeeTo

14-Dec-05 2:57

Hi. I am a newbie in programming C#, and am having a mental block. I am programming for the pocketPC.

I have a Combobox named "Type" and have a list there. I want to show the results of the entry from the combobox into a text label.

For example,
I pick "fruit" from the combobox.
I want to display on the screen: "This food is a fruit"
If I pick "vegetable" from the combobox, it should display:
"This food is a vegetable"

Right now, I'm getting:
"This food is a 1"
"This food is a 2"

How can I make the 2 into vegetable?

This is what I have, and I have a feeling it has to do with the GetValue and/or GetOrdinal.... I just can't seem to get it to work....

TypeLabel.Text = rReader.GetValue(rReader.GetOrdinal("MovieType")).ToString();

Thanks... Sorry for such a dumb question. Sigh | :sigh:

If I haven't given you enough code, let me know. I can always add more. Laugh | :laugh:

Re: Combobox

albCode14-Dec-05 3:41

albCode

14-Dec-05 3:41

try this

on comboBox1_SelectedIndexChanged event write this code

this.textBox1.Text = this.comboBox1.Text;

//each item u select from combobox the text of selected index should appear in textbox

I hope this helps

Re: Combobox

SpeBeeTo14-Dec-05 3:46

SpeBeeTo

14-Dec-05 3:46

Thank you so much!

I will try it out immediately and let you know!

Thanks again!

Big Grin | :-D

Re: Combobox

albCode14-Dec-05 3:59

albCode

14-Dec-05 3:59

Never Mind dude we are here to helps each-others
Cool | :cool:

Re: Combobox

SpeBeeTo14-Dec-05 6:36

SpeBeeTo

14-Dec-05 6:36

Okay, I thought I understood what I'm doing, but it's not really working. Confused | :confused:

I added this:
this.GLabel.Text = this.TypeCombo.Text;

To the Windows Form Designer generated code.

I added this:

OnTypeCombo_SelectedIndexChanged "1" write male;

It gives me the following error:
Invalid token "1" in class, struct, or interface member declaration.

Cry | :((

Re: Combobox

tatchung14-Dec-05 19:01

tatchung

14-Dec-05 19:01

Hello!

Oh my bad...try this in windows for designer:
this.combobox1.SelectedIndexChanged += new System.EventHandler(this.combobox1_SelectedIndexChanged);

then have this code inside the EventArgs:
this.Label.Text = this.combobox1.SelectedItem.Text

hope that works Blush | :O

Aim small, miss small...

-- modified at 1:02 Thursday 15th December, 2005

Re: Combobox

albCode14-Dec-05 20:55

albCode

14-Dec-05 20:55

private void comboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.textBox1.Text = this.comboBox1.Text;
}

//this code must work, i tested multiple time and works fine.
I hope u fill combobox in onLoad Event of ur Form or u fill combobox from another event

Re: Combobox

SpeBeeTo15-Dec-05 1:28

SpeBeeTo

15-Dec-05 1:28

Thanks guys!

Off to the new "challenge"!!!!

Smile | :)

New Combobox Challenge

SpeBeeTo15-Dec-05 8:27

SpeBeeTo

15-Dec-05 8:27

Well, it worked. Smile | :)

Thanks again.

I have another problem, errr, challenge now. I am using an SQL database to save the info the person chooses on one form (pedbone.cs).

Here's the code to the Combobox I've got on the "main" form (pedbone.cs):

// populate the list - gender<br />
                    m_cTypes = new ArrayList();<br />
                    m_cTypes.Add("Unknown");                      <br />
                    m_cTypes.Add("Male");<br />
                    m_cTypes.Add("Female");<br />
                    TypeCombo.DataSource = m_cTypes;

These are listed in a ListView

<br />
			SqlCeCommand sqlLoadEvents = m_cConn.CreateCommand();<br />
			sqlLoadEvents.CommandText = szSQL;<br />
			SqlCeDataReader rReader = sqlLoadEvents.ExecuteReader();<br />
		<br />
		while ( rReader.Read() )<br />
			{<br />
				 				lvItem.SubItems.Add(GetTypeFromNumber ((int)rReader.GetValue(rReader.GetOrdinal("MovieType"))));// Gender				<br />
                CollectionList.Items.Add( lvItem );<br />
			}<br />
		}

And here I got the Combobox text to show in the ListView, by using this code

private string GetTypeFromNumber(int nTypeID)<br />
    {<br />
        return (m_cTypes[nTypeID].ToString());<br />
    }

Now, when you click on the listview item, a new form opens up (AddEditMovieForm.cs) to view the file in more detail. And here's where I'm running into a bit of a bind.

public AddEditMovieForm(SqlCeConnection cConn, int nMovieID)<br />
                {<br />
                        InitializeComponent();<br />
<br />
                        m_cConn = cConn;<br />
                        m_nMovieID = nMovieID;<br />
                        m_cTypes = new ArrayList();<br />
<br />
                        if ( m_nMovieID != -1 )<br />
                        {<br />
                        SqlCeCommand sqlCommand = m_cConn.CreateCommand();<br />
                        sqlCommand.CommandText = "SELECT * FROM MOVIE_MNGR_TABLE where MovieID = "+m_nMovieID.ToString();<br />
<br />
<br />
                                SqlCeDataReader rReader = sqlCommand.ExecuteReader();<br />
                                if ( rReader.Read() )<br />
                                {<br />
<br />
        }<br />
<br />
                                        {<br />
<br />
      GenderLabel.Text = rReader.GetValue(rReader.GetOrdinal("MovieType")).ToString();// Gender<br />
<br />
                                                                                        {<br />
                                                                                }<br />
                                        }<br />
<br />
<br />
                                }<br />
                        }

Any help would be appreciated. I would like to add "male" or "female" into the GenderLabel.Text field. If I neglected to add any important code, please let me know. Smile | :)

Thanks guys,

M.

-- modified at 14:30 Thursday 15th December, 2005

Can somebody suggest me which Data Object to use in a database independent project(oracle or sqlserver)

YogeshChoudhary14-Dec-05 1:08

YogeshChoudhary

14-Dec-05 1:08

I am working on classlibrary project in which I have to write a class which supports both oracle as well as sqlserver.Which Data object i should use?

-- modified at 7:09 Wednesday 14th December, 2005

Re: Can somebody suggest me which Data Object to use in a database independent project(oracle or sqlserver)

xtroll14-Dec-05 1:41

xtroll

14-Dec-05 1:41

Hi,

You can use a Factory which uses two object like this :

the following objects inherite of DataObject (your main class)
- DataObjectOracle
- DataObjectSqlServer

Your main class : DataObject will be used by an object DataObjectFactory

Your new object DataObjectFactory will be used by all your objects whose need access to database. In your factory object you must declare a method which must be static and have a parameter type of string.
Parameter contains the name of your wanted object.

For more information see the following link which demonstrate by picture my thing Laugh | :laugh:

: http://www.dofactory.com/Patterns/PatternPrototype.aspx

X-TroLL

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