set selected index of a ComboBox

[Steffen Laser]

Hi group,
I have a problem that I already have posted to the german C# newsgroup.
Since nobody could help me there, I'd like to try it here again:

I set the selected item of a combobox like this:

myCombo.Selecte dItem = 3;

But after that the ComboBox displays only the first entry of the list.
When I add the line

myCombo.Dropped Down = true;

before, and then step trough the code, I can see the list of the combo
dropping down, then the index (in this case 3) gets selected. After that,
the method is finished, no other code is processed. And then, when the form
comes up, there is the first item selected!

Funny, that the same code works some weeks ago - at this place nothing
changed. Does anybody have an idea what there happens? Or could it be, that
there is a problem with a MS patch or something like that?

Greetings,
Steffen.

[Vince Yuan]

Hi Steffen,
You should use SelectedIndex property!

Example
[Visual Basic, C#, C++] The following example illustrates the usage of the FindString method and SelectedIndex property. The example is part of a runnable code sample in the ComboBox class overview.

[Visual Basic]
Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As System.EventArg s)
Dim index As Integer
index = comboBox1.FindS tring(textBox2. Text)
comboBox1.Selec tedIndex = index
End Sub
[C#]
private void findButton_Clic k(object sender, System.EventArg s e) {
int index = comboBox1.FindS tring(textBox2. Text);
comboBox1.Selec tedIndex = index;
}"Steffen Laser" <sg*****@interm et.de> wrote in message news:OD******** ******@TK2MSFTN GP09.phx.gbl...

Hi group,
I have a problem that I already have posted to the german C# newsgroup.
Since nobody could help me there, I'd like to try it here again:

I set the selected item of a combobox like this:

myCombo.Selecte dItem = 3;

But after that the ComboBox displays only the first entry of the list.
When I add the line

myCombo.Dropped Down = true;

before, and then step trough the code, I can see the list of the combo
dropping down, then the index (in this case 3) gets selected. After that,
the method is finished, no other code is processed. And then, when the form
comes up, there is the first item selected!

Funny, that the same code works some weeks ago - at this place nothing
changed. Does anybody have an idea what there happens? Or could it be, that
there is a problem with a MS patch or something like that?

Greetings,
Steffen.

[Steffen Laser]

Hi Juan,
thank you very much, but I tried all of the following:

SelectedIdex = 3;

SelectedItem = object; // since the datasource contains an ArrayList of
objects with overridden ToString()-Method. I also tried an ArrayList with
Strings as DataSource - without success, also with SelectedIndex and the
followwing

FindStringExact ("searchstring" );

Thanks,
Steffen.

"Vince Yuan" <sh*******@citi z.net> schrieb im Newsbeitrag
news:OF******** ******@tk2msftn gp13.phx.gbl...
Hi Steffen,
You should use SelectedIndex property!

Example
[Visual Basic, C#, C++] The following example illustrates the usage of the
FindString method and SelectedIndex property. The example is part of a
runnable code sample in the ComboBox class overview.
[Visual Basic]
Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As
System.EventArg s)
Dim index As Integer
index = comboBox1.FindS tring(textBox2. Text)
comboBox1.Selec tedIndex = index
End Sub
[C#]
private void findButton_Clic k(object sender, System.EventArg s e) {
int index = comboBox1.FindS tring(textBox2. Text);
comboBox1.Selec tedIndex = index;
}

"Steffen Laser" <sg*****@interm et.de> wrote in message
news:OD******** ******@TK2MSFTN GP09.phx.gbl...

Hi group,
I have a problem that I already have posted to the german C# newsgroup.
Since nobody could help me there, I'd like to try it here again:

I set the selected item of a combobox like this:

myCombo.Selecte dItem = 3;

But after that the ComboBox displays only the first entry of the list.
When I add the line

myCombo.Dropped Down = true;

before, and then step trough the code, I can see the list of the combo
dropping down, then the index (in this case 3) gets selected. After that,
the method is finished, no other code is processed. And then, when the form comes up, there is the first item selected!

Funny, that the same code works some weeks ago - at this place nothing
changed. Does anybody have an idea what there happens? Or could it be, that there is a problem with a MS patch or something like that?

Greetings,
Steffen.

[Steffen Laser]

Hi Juan,
thank you very much, but I tried all of the following:

(1) SelectedIndex = 3;

(2) SelectedItem = object;
// since the datasource contains an ArrayList of
//objects with overridden ToString()-Method.
//I also tried an ArrayList with Strings as DataSource
// with all here mentioned methods/Properties - with the same result
// as reported in my first mail.

(3) FindStringExact ("searchstring" );

Thanks,
Steffen.

"Vince Yuan" <sh*******@citi z.net> schrieb im Newsbeitrag
news:OF******** ******@tk2msftn gp13.phx.gbl...
Hi Steffen,
You should use SelectedIndex property!

Example
[Visual Basic, C#, C++] The following example illustrates the usage of the
FindString method and SelectedIndex property. The example is part of a
runnable code sample in the ComboBox class overview.
[Visual Basic]
Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As
System.EventArg s)
Dim index As Integer
index = comboBox1.FindS tring(textBox2. Text)
comboBox1.Selec tedIndex = index
End Sub
[C#]
private void findButton_Clic k(object sender, System.EventArg s e) {
int index = comboBox1.FindS tring(textBox2. Text);
comboBox1.Selec tedIndex = index;
}

"Steffen Laser" <sg*****@interm et.de> wrote in message
news:OD******** ******@TK2MSFTN GP09.phx.gbl...

Hi group,
I have a problem that I already have posted to the german C# newsgroup.
Since nobody could help me there, I'd like to try it here again:

I set the selected item of a combobox like this:

myCombo.Selecte dItem = 3;

But after that the ComboBox displays only the first entry of the list.
When I add the line

myCombo.Dropped Down = true;

before, and then step trough the code, I can see the list of the combo
dropping down, then the index (in this case 3) gets selected. After that,
the method is finished, no other code is processed. And then, when the form comes up, there is the first item selected!

Funny, that the same code works some weeks ago - at this place nothing
changed. Does anybody have an idea what there happens? Or could it be, that there is a problem with a MS patch or something like that?

Greetings,
Steffen.

[Zürcher See]

You mussn't change the data source after the DataSource assignment (At least
i think)
Try to add the DataSourceChang ed event and add a breakpoint inside it.
"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:Oq******** ******@tk2msftn gp13.phx.gbl...

Hi Juan,
thank you very much, but I tried all of the following:

SelectedIdex = 3;

SelectedItem = object; // since the datasource contains an ArrayList of
objects with overridden ToString()-Method. I also tried an ArrayList with
Strings as DataSource - without success, also with SelectedIndex and the
followwing

FindStringExact ("searchstring" );

Thanks,
Steffen.

"Vince Yuan" <sh*******@citi z.net> schrieb im Newsbeitrag
news:OF******** ******@tk2msftn gp13.phx.gbl...
Hi Steffen,
You should use SelectedIndex property!

Example
[Visual Basic, C#, C++] The following example illustrates the usage of the
FindString method and SelectedIndex property. The example is part of a
runnable code sample in the ComboBox class overview.
[Visual Basic]
Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As
System.EventArg s)
Dim index As Integer
index = comboBox1.FindS tring(textBox2. Text)
comboBox1.Selec tedIndex = index
End Sub
[C#]
private void findButton_Clic k(object sender, System.EventArg s e) {
int index = comboBox1.FindS tring(textBox2. Text);
comboBox1.Selec tedIndex = index;
}

"Steffen Laser" <sg*****@interm et.de> wrote in message
news:OD******** ******@TK2MSFTN GP09.phx.gbl...

Hi group,
I have a problem that I already have posted to the german C# newsgroup.
Since nobody could help me there, I'd like to try it here again:

I set the selected item of a combobox like this:

myCombo.Selecte dItem = 3;

But after that the ComboBox displays only the first entry of the list.
When I add the line

myCombo.Dropped Down = true;

before, and then step trough the code, I can see the list of the combo
dropping down, then the index (in this case 3) gets selected. After that, the method is finished, no other code is processed. And then, when the

form

comes up, there is the first item selected!

Funny, that the same code works some weeks ago - at this place nothing
changed. Does anybody have an idea what there happens? Or could it be,

that

there is a problem with a MS patch or something like that?

Greetings,
Steffen.

[Sijin Joseph]

Works for me using SelectedIndex, can you post some code that reproduces
this behaviour.

Sijin Joseph
http://www.indiangeek.net
http://weblogs.asp.net/sjoseph

Steffen Laser wrote:

Hi group,
I have a problem that I already have posted to the german C# newsgroup.
Since nobody could help me there, I'd like to try it here again:

I set the selected item of a combobox like this:

myCombo.Selecte dItem = 3;

But after that the ComboBox displays only the first entry of the list.
When I add the line

myCombo.Dropped Down = true;

before, and then step trough the code, I can see the list of the combo
dropping down, then the index (in this case 3) gets selected. After that,
the method is finished, no other code is processed. And then, when the form
comes up, there is the first item selected!

Funny, that the same code works some weeks ago - at this place nothing
changed. Does anybody have an idea what there happens? Or could it be, that
there is a problem with a MS patch or something like that?

Greetings,
Steffen.

[Steffen Laser]

Hello/Grüezi Zürcher See,

very good point - not the DataSourceChang ed-event but the events

SelectedValueCh anged
SelectedindexCh anged
and SelectionChange Committed

were fired. Do you have an idea how this could be? It happens after all code
I wrote is executed after leaving the last method of my code that was
called. The caller list shows only a method, that started the whole process.
Must be some code inside the .net classes. How can I track this code? Do I
have to derive the gui classes and override their methods to trace, which
methods are called, or is their a smarter method? Where can I find a
detailled description of gui processing in .net?

Thanx,
Steffen.

"Zürcher See" <aq****@cannabi smail.com> schrieb im Newsbeitrag
news:Ob******** *****@TK2MSFTNG P11.phx.gbl...

You mussn't change the data source after the DataSource assignment (At least i think)
Try to add the DataSourceChang ed event and add a breakpoint inside it.
"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:Oq******** ******@tk2msftn gp13.phx.gbl...

Hi Juan,
thank you very much, but I tried all of the following:

SelectedIdex = 3;

SelectedItem = object; // since the datasource contains an ArrayList of
objects with overridden ToString()-Method. I also tried an ArrayList with

Strings as DataSource - without success, also with SelectedIndex and the
followwing

FindStringExact ("searchstring" );

Thanks,
Steffen.

"Vince Yuan" <sh*******@citi z.net> schrieb im Newsbeitrag
news:OF******** ******@tk2msftn gp13.phx.gbl...
Hi Steffen,
You should use SelectedIndex property!

Example
[Visual Basic, C#, C++] The following example illustrates the usage of the FindString method and SelectedIndex property. The example is part of a
runnable code sample in the ComboBox class overview.
[Visual Basic]
Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As
System.EventArg s)
Dim index As Integer
index = comboBox1.FindS tring(textBox2. Text)
comboBox1.Selec tedIndex = index
End Sub
[C#]
private void findButton_Clic k(object sender, System.EventArg s e) {
int index = comboBox1.FindS tring(textBox2. Text);
comboBox1.Selec tedIndex = index;
}

"Steffen Laser" <sg*****@interm et.de> wrote in message
news:OD******** ******@TK2MSFTN GP09.phx.gbl...

Hi group,
I have a problem that I already have posted to the german C# newsgroup. Since nobody could help me there, I'd like to try it here again:

I set the selected item of a combobox like this:

myCombo.Selecte dItem = 3;

But after that the ComboBox displays only the first entry of the list.
When I add the line

myCombo.Dropped Down = true;

before, and then step trough the code, I can see the list of the combo
dropping down, then the index (in this case 3) gets selected. After

that, the method is finished, no other code is processed. And then, when the

form

comes up, there is the first item selected!

Funny, that the same code works some weeks ago - at this place nothing
changed. Does anybody have an idea what there happens? Or could it be,

that

there is a problem with a MS patch or something like that?

Greetings,
Steffen.

[Zürcher See]

To track the code is very simple ... just add an bug :)
try{int a=1/0;}
catch(System.Ex ception e){e.StackTrace ;}

but without the code is difficult to say what is wrong :(
"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:e3******** ******@TK2MSFTN GP09.phx.gbl...

Hello/Grüezi Zürcher See,

very good point - not the DataSourceChang ed-event but the events

SelectedValueCh anged
SelectedindexCh anged
and SelectionChange Committed

were fired. Do you have an idea how this could be? It happens after all code I wrote is executed after leaving the last method of my code that was
called. The caller list shows only a method, that started the whole process. Must be some code inside the .net classes. How can I track this code? Do I
have to derive the gui classes and override their methods to trace, which
methods are called, or is their a smarter method? Where can I find a
detailled description of gui processing in .net?

Thanx,
Steffen.

"Zürcher See" <aq****@cannabi smail.com> schrieb im Newsbeitrag
news:Ob******** *****@TK2MSFTNG P11.phx.gbl...

You mussn't change the data source after the DataSource assignment (At

least

i think)
Try to add the DataSourceChang ed event and add a breakpoint inside it.
"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:Oq******** ******@tk2msftn gp13.phx.gbl...

Hi Juan,
thank you very much, but I tried all of the following:

SelectedIdex = 3;

SelectedItem = object; // since the datasource contains an ArrayList of objects with overridden ToString()-Method. I also tried an ArrayList with Strings as DataSource - without success, also with SelectedIndex and the followwing

FindStringExact ("searchstring" );

Thanks,
Steffen.

"Vince Yuan" <sh*******@citi z.net> schrieb im Newsbeitrag
news:OF******** ******@tk2msftn gp13.phx.gbl...
Hi Steffen,
You should use SelectedIndex property!

Example
[Visual Basic, C#, C++] The following example illustrates the usage of the FindString method and SelectedIndex property. The example is part of a
runnable code sample in the ComboBox class overview.
[Visual Basic]
Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As
System.EventArg s)
Dim index As Integer
index = comboBox1.FindS tring(textBox2. Text)
comboBox1.Selec tedIndex = index
End Sub
[C#]
private void findButton_Clic k(object sender, System.EventArg s e) {
int index = comboBox1.FindS tring(textBox2. Text);
comboBox1.Selec tedIndex = index;
}

"Steffen Laser" <sg*****@interm et.de> wrote in message
news:OD******** ******@TK2MSFTN GP09.phx.gbl...
> Hi group,
> I have a problem that I already have posted to the german C# newsgroup. > Since nobody could help me there, I'd like to try it here again:
>
> I set the selected item of a combobox like this:
>
> myCombo.Selecte dItem = 3;
>
> But after that the ComboBox displays only the first entry of the list. > When I add the line
>
> myCombo.Dropped Down = true;
>
> before, and then step trough the code, I can see the list of the combo > dropping down, then the index (in this case 3) gets selected. After

that,

> the method is finished, no other code is processed. And then, when the form
> comes up, there is the first item selected!
>
> Funny, that the same code works some weeks ago - at this place nothing > changed. Does anybody have an idea what there happens? Or could it be, that
> there is a problem with a MS patch or something like that?
>
> Greetings,
> Steffen.
>
>

[Steffen Laser]

Hello Zürcher See,
thank you, your hint lead me to the right solution. I could solve the
problem, that was generated by the specific imlementation of the
application - concerning to this, the method that queries the data can not
be located in the constructor of the form. In fact, I do not know exactly,
why this behaviour originates - but I redesigned the order of code calls and
now it is working properly! So thanks again for your help and assistance!

Steffen.

"Zürcher See" <aq****@cannabi smail.com> schrieb im Newsbeitrag
news:%2******** *******@TK2MSFT NGP09.phx.gbl.. .

To track the code is very simple ... just add an bug :)
try{int a=1/0;}
catch(System.Ex ception e){e.StackTrace ;}

but without the code is difficult to say what is wrong :(
"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:e3******** ******@TK2MSFTN GP09.phx.gbl...

Hello/Grüezi Zürcher See,

very good point - not the DataSourceChang ed-event but the events

SelectedValueCh anged
SelectedindexCh anged
and SelectionChange Committed

were fired. Do you have an idea how this could be? It happens after all

code

I wrote is executed after leaving the last method of my code that was
called. The caller list shows only a method, that started the whole

process.

Must be some code inside the .net classes. How can I track this code? Do I

have to derive the gui classes and override their methods to trace, which methods are called, or is their a smarter method? Where can I find a
detailled description of gui processing in .net?

Thanx,
Steffen.

"Zürcher See" <aq****@cannabi smail.com> schrieb im Newsbeitrag
news:Ob******** *****@TK2MSFTNG P11.phx.gbl...

You mussn't change the data source after the DataSource assignment (At

least

i think)
Try to add the DataSourceChang ed event and add a breakpoint inside it.
"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:Oq******** ******@tk2msftn gp13.phx.gbl...
> Hi Juan,
> thank you very much, but I tried all of the following:
>
> SelectedIdex = 3;
>
> SelectedItem = object; // since the datasource contains an ArrayList of > objects with overridden ToString()-Method. I also tried an ArrayList

with

> Strings as DataSource - without success, also with SelectedIndex and the > followwing
>
> FindStringExact ("searchstring" );
>
> Thanks,
> Steffen.
>
>
>
> "Vince Yuan" <sh*******@citi z.net> schrieb im Newsbeitrag
> news:OF******** ******@tk2msftn gp13.phx.gbl...
> Hi Steffen,
> You should use SelectedIndex property!
>
> Example
> [Visual Basic, C#, C++] The following example illustrates the usage of the

> FindString method and SelectedIndex property. The example is part of

a > runnable code sample in the ComboBox class overview.
> [Visual Basic]
> Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As
> System.EventArg s)
> Dim index As Integer
> index = comboBox1.FindS tring(textBox2. Text)
> comboBox1.Selec tedIndex = index
> End Sub
> [C#]
> private void findButton_Clic k(object sender, System.EventArg s e) {
> int index = comboBox1.FindS tring(textBox2. Text);
> comboBox1.Selec tedIndex = index;
> }
>
> "Steffen Laser" <sg*****@interm et.de> wrote in message
> news:OD******** ******@TK2MSFTN GP09.phx.gbl...
> > Hi group,
> > I have a problem that I already have posted to the german C#

newsgroup.

> > Since nobody could help me there, I'd like to try it here again:
> >
> > I set the selected item of a combobox like this:
> >
> > myCombo.Selecte dItem = 3;
> >
> > But after that the ComboBox displays only the first entry of the

list. > > When I add the line
> >
> > myCombo.Dropped Down = true;
> >
> > before, and then step trough the code, I can see the list of the combo > > dropping down, then the index (in this case 3) gets selected. After that,
> > the method is finished, no other code is processed. And then, when the > form
> > comes up, there is the first item selected!
> >
> > Funny, that the same code works some weeks ago - at this place nothing > > changed. Does anybody have an idea what there happens? Or could it be, > that
> > there is a problem with a MS patch or something like that?
> >
> > Greetings,
> > Steffen.
> >
> >
>
>

[Zürcher See]

Nothing :) tschüss

"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Hello Zürcher See,
thank you, your hint lead me to the right solution. I could solve the
problem, that was generated by the specific imlementation of the
application - concerning to this, the method that queries the data can not
be located in the constructor of the form. In fact, I do not know exactly,
why this behaviour originates - but I redesigned the order of code calls and now it is working properly! So thanks again for your help and assistance!

Steffen.

"Zürcher See" <aq****@cannabi smail.com> schrieb im Newsbeitrag
news:%2******** *******@TK2MSFT NGP09.phx.gbl.. .

To track the code is very simple ... just add an bug :)
try{int a=1/0;}
catch(System.Ex ception e){e.StackTrace ;}

but without the code is difficult to say what is wrong :(
"Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
news:e3******** ******@TK2MSFTN GP09.phx.gbl...

Hello/Grüezi Zürcher See,

very good point - not the DataSourceChang ed-event but the events

SelectedValueCh anged
SelectedindexCh anged
and SelectionChange Committed

were fired. Do you have an idea how this could be? It happens after all

code

I wrote is executed after leaving the last method of my code that was
called. The caller list shows only a method, that started the whole process.

Must be some code inside the .net classes. How can I track this code?

Do I have to derive the gui classes and override their methods to trace, which methods are called, or is their a smarter method? Where can I find a
detailled description of gui processing in .net?

Thanx,
Steffen.

"Zürcher See" <aq****@cannabi smail.com> schrieb im Newsbeitrag
news:Ob******** *****@TK2MSFTNG P11.phx.gbl...
> You mussn't change the data source after the DataSource assignment

(At least
> i think)
> Try to add the DataSourceChang ed event and add a breakpoint inside it. >
>
> "Steffen Laser" <sg*****@interm et.de> schrieb im Newsbeitrag
> news:Oq******** ******@tk2msftn gp13.phx.gbl...
> > Hi Juan,
> > thank you very much, but I tried all of the following:
> >
> > SelectedIdex = 3;
> >
> > SelectedItem = object; // since the datasource contains an ArrayList

of

> > objects with overridden ToString()-Method. I also tried an

ArrayList with
> > Strings as DataSource - without success, also with SelectedIndex

and the

> > followwing
> >
> > FindStringExact ("searchstring" );
> >
> > Thanks,
> > Steffen.
> >
> >
> >
> > "Vince Yuan" <sh*******@citi z.net> schrieb im Newsbeitrag
> > news:OF******** ******@tk2msftn gp13.phx.gbl...
> > Hi Steffen,
> > You should use SelectedIndex property!
> >
> > Example
> > [Visual Basic, C#, C++] The following example illustrates the

usage of the
> > FindString method and SelectedIndex property. The example is part

of

a > > runnable code sample in the ComboBox class overview.
> > [Visual Basic]
> > Private Sub findButton_Clic k(ByVal sender As Object, ByVal e As
> > System.EventArg s)
> > Dim index As Integer
> > index = comboBox1.FindS tring(textBox2. Text)
> > comboBox1.Selec tedIndex = index
> > End Sub
> > [C#]
> > private void findButton_Clic k(object sender, System.EventArg s e) {
> > int index = comboBox1.FindS tring(textBox2. Text);
> > comboBox1.Selec tedIndex = index;
> > }
> >
> > "Steffen Laser" <sg*****@interm et.de> wrote in message
> > news:OD******** ******@TK2MSFTN GP09.phx.gbl...
> > > Hi group,
> > > I have a problem that I already have posted to the german C#
newsgroup.
> > > Since nobody could help me there, I'd like to try it here again:
> > >
> > > I set the selected item of a combobox like this:
> > >
> > > myCombo.Selecte dItem = 3;
> > >
> > > But after that the ComboBox displays only the first entry of the

list.

> > > When I add the line
> > >
> > > myCombo.Dropped Down = true;
> > >
> > > before, and then step trough the code, I can see the list of the

combo

> > > dropping down, then the index (in this case 3) gets selected. After > that,
> > > the method is finished, no other code is processed. And then,

when the

> > form
> > > comes up, there is the first item selected!
> > >
> > > Funny, that the same code works some weeks ago - at this place

nothing

> > > changed. Does anybody have an idea what there happens? Or could

it be,

> > that
> > > there is a problem with a MS patch or something like that?
> > >
> > > Greetings,
> > > Steffen.
> > >
> > >
> >
> >
>
>