New Combobox Challenge - C# Discussion Boards

albCode14-Dec-05 3:41

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

Conversion of Hexadecimal into Binary format

kansalSunny14-Dec-05 0:44

kansalSunny

14-Dec-05 0:44

How can i convert Hexadecimal into binary an vice versa

Re: Conversion of Hexadecimal into Binary format

Vikram A Punathambekar14-Dec-05 1:15

Vikram A Punathambekar

14-Dec-05 1:15

What does the first link show?[^]

Cheers,
Vikram.

"When I read in books about a "base class", I figured this was the class that was at the bottom of the inheritence tree. It's the "base", right? Like the base of a pyramid." - Marc Clifton.

Re: Conversion of Hexadecimal into Binary format

Guffa14-Dec-05 1:15

Guffa

14-Dec-05 1:15

Convert from hexadecimal to numeric, then from numeric to binary. The other ways goes... well... the other way...

---
b { font-weight: normal; }

To Convert Julian Time Calendar Date?

MudkiSekhon14-Dec-05 0:29

MudkiSekhon

14-Dec-05 0:29

Hi Friends,
If anybody knows the procedure to convert Julian time calendar date to dd-mm-yyyy format, plz help me.

Thanks,
Sandeep
+919891027854

Re: To Convert Julian Time Calendar Date?

Polis Pilavas14-Dec-05 2:04

Polis Pilavas

14-Dec-05 2:04

Take a look here[^], or here[^].

Regards,
Polis

Can you practice what you teach?

extra row in datagrid

Greeky14-Dec-05 0:16

Greeky

14-Dec-05 0:16

at run time a create a table with 20 row , then set it to Datagrid but data grid also shows 21st extra row to enter data. How can i prevent that.

Re: extra row in datagrid

J4amieC14-Dec-05 0:40

J4amieC

14-Dec-05 0:40

set the datagrid's ReadOnly property to true, or set the dataview's AllowNew property to false

Re: extra row in datagrid

Greeky14-Dec-05 0:51

Greeky

14-Dec-05 0:51

THANK YOU

[URGENT] : How to capture ListBox vertical scrollbar position

xtroll14-Dec-05 0:03

xtroll

14-Dec-05 0:03

Hi everybody,

I have a big problem with listbox Sigh | :sigh:

. I created a user control which contains two listboxes and two buttons to permit switch a single or multiple items from listbox1 to listbox2.

When I click into vertical scrollbar (not on the track button but inside the scrollbar, Confused | :confused:

it moves itself to place the selected item on bottom of the active listbox Confused | :confused:

. My problem is that play only at the first time that I use the listbox Mad | :mad:

(after the form load event)

I hope have clearly explain my problem D'Oh! | :doh:

and hope someone help me.

PLEASE.......... HELP ME !!!!!!!!!

Thanks for help.

X-TroLL

[Resolved] - [URGENT] : How to capture ListBox vertical scrollbar position

xtroll14-Dec-05 4:55

xtroll

14-Dec-05 4:55

problem resolved

link label in listview cell c# win forms

fady_sayegh13-Dec-05 23:58

fady_sayegh

13-Dec-05 23:58

hi to all,

how can i put a link label in a listview cell ? and how to fire an event when i click the data in the cell ?

best regards and thanks in advance

fady

Help understanding value types

-Rowan-13-Dec-05 23:45

-Rowan-

13-Dec-05 23:45

I have the following within my myWall Class:

<br />
private Point _wallLocation = null;<br />
<br />
public myWall(Point newLocation)<br />
{<br />
this._wallLocation = newLocation;<br />
}<br />

This returns a compile time error of:

Cannot convert null to 'System.Drawing.Point' because it is a value type

So I have to use one of the following two options and either make it:

<br />
private Point _wallLocation;<br />

<br />
private Point _wallLocation = new Point(1,1);<br />

I am new to C# (< 5 days) with a C background, so to me the first option isn't good because I have an unassigned variable kicking around. The second option isn't any good because I am wasting resources allocating a Point that I will never use.

What is the best way to allocate a ValueType that has nothing stored in it if I can't null it?

If I use the first example does that mean that the Point is actually allocated? If so does it have random data in it? This would imply that the two options above cost exactly the same processor wise.

Thanks.

-Rowan

Re: Help understanding value types

GDavy14-Dec-05 0:06

GDavy

14-Dec-05 0:06

Look at it this way.. Whenever you have a value type, like int, double, ..., or any struct (like the Point in your code), treat the thing as you would a normal variable which is not dynamically allocated. The value types are not allocated on the heap, as are all objects of classes in C#. But they are placed on the stack.
Assigning null to a reference object (an object of a class) derefences the memory, so that the gc can clean up the mem when there are no other reference to that particular memory. Since value types are not on the heap no cleaning up is necessary (they go out of scope).
Put it otherwise all objects of classes are pointers to these object, all objects of value types are just that the object itself.
You will need to initialize your Point with a default value if the (0,0)(which is the default) is not to your liking.
I hope this sheds some light to the issue for you.

Greetings
Davy

Re: Help understanding value types

xtroll14-Dec-05 0:13

xtroll

14-Dec-05 0:13

Hi,

Why do you not use a property ?

<br />
private Point _wallLocation;<br />
public Point WallLocation<br />
{<br />
    get{return _wallLocation;}<br />
    set{_wallLocation=value;}<br />
}<br />
<br />
And into your class constructor<br />
public Constructor()<br />
{<br />
    _wallLocation = new Point(0, 0);<br />
}<br />

I think that the best solution because the Nullable type is not implemented in the .Net Framework 1.X but in 2.0 it does Big Grin | :-D

.

In .Net programming, you must allocate all variables having ValueType type.

I hope that help you Smile | :)

X-TroLL

Re: Help understanding value types

Vikram A Punathambekar14-Dec-05 1:25

Vikram A Punathambekar

14-Dec-05 1:25

-Rowan- wrote:
the first option isn't good because I have an unassigned variable kicking around.

I don't think you need to bother about that - whenever you try to use something like _wallLocation.x, the compiler flags it as an error, so you won't get any nasty runtime surprises. Smile | :)

-Rowan- wrote:
If I use the first example does that mean that the Point is actually allocated?

I'm a tyro myself, but I think the answer is No.

HTH. Smile | :)

Cheers,
Vikram.

"When I read in books about a "base class", I figured this was the class that was at the bottom of the inheritence tree. It's the "base", right? Like the base of a pyramid." - Marc Clifton.

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