Finding controls [modified] - C# Discussion Boards

thatraja11-Mar-11 12:50

thatraja

11-Mar-11 12:50

Here you go

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thatraja

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Syed Shahid Hussain11-Mar-11 13:10

Syed Shahid Hussain

11-Mar-11 13:10

Hei Thatraja,

Thanks u so so so so much. You dont know how big treasure u have given to me.

I'm Happy Thanks once again.

Syed Shahid Hussain

Dave Kreskowiak11-Mar-11 12:51

Dave Kreskowiak

11-Mar-11 12:51

Best practice is that you don't do this. SQL Server is only supported as a seperate install.

Once the server is installed and running seperately, your application installer can be told which SQL Server to use and what the login credentials should be to execute a SQL script to add your users and setup the database and its security.

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Syed Shahid Hussain11-Mar-11 13:12

Syed Shahid Hussain

11-Mar-11 13:12

Thanks for ur reply.

I'll read the setup process completely and keep in mind ur points while developing setup project.

Syed Shahid Hussain

Finding controls [modified]

Dalek Dave11-Mar-11 13:52

Dalek Dave

11-Mar-11 13:52

Simple answer is yes.

But, what the hell do you want to install?

------------------------------------

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Orcun Iyigun11-Mar-11 7:02

Orcun Iyigun

11-Mar-11 7:02

Hello all,

I have two questions.
1) I have labels and textbox.
For ex;

lblName1.Text = txtName.Text;
lblName2.Text = txtName.Text;
lblName3.Text = txtName.Text;
lblName4.Text = txtName.Text;

Is there a way that i can do that in a loop something like:

for(i=0; i<4; i++)
{
lblName[i].Text = txtName.Text; // of course it does not accept [i] Smile | :)

}

2) How can I find a certain type of a contol in a webform and change the controls property.

Ex; I have 10 checkboxes. without coding one by one. Is there a way that I can assign its check selected to false more proper way ;

cb1.Checked = false;
cb2.Checked = false;
cb3.Checked = false;
.
.
cb10.Checked = false;

Thanks.

modified on Friday, March 11, 2011 1:30 PM

OriginalGriff11-Mar-11 9:09

OriginalGriff

11-Mar-11 9:09

1) You can do it - sort of - with reflection, but it is one heck of a sledgehammer to crap a simple nut. What you end up with will be longer than the code to do it directly, and a lot harder to read and understand.
If you really want to access a number of controls in a loop, can I suggest the simpler, elegant way of having a class level list of labels?

List<Label>myLabels = new List<Label>();
...
myLabels.Add(lblName1);
myLabels.Add(lblName2);
myLabels.Add(lblName3);
myLabels.Add(lblName4);
...
foreach (Label lab in myLabels)
   {
   lab.Text = txtName.Text;
   }

2) Not sure what you mean here: are you trying to do the same as in (1) but for CheckBox? If so, then the same answer applies. If not, then what are you trying to do?

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Orcun Iyigun11-Mar-11 9:50

Orcun Iyigun

11-Mar-11 9:50

Well actually I mislead you on the first one it was like;
lblName1.Text = txtName.Text;
lblName2.Text = txtName.Text;
lblSurname1.Text = txtSurname.Text;
lblSurname2.Text = txtSurname.Text;

so seems like it is better for me to code it directly.

for the second one; after evaluating your answer, it seems like the solution for the second is the same with Q 1 Smile | :)

GenJerDan11-Mar-11 11:26

GenJerDan

11-Mar-11 11:26

Anyway, even though you've apparently changed what you need to do, what you originaly asked for *is* possible, relatively easily done, and only moderately dangerous. Laugh | :laugh:

for (int i = 0; i < 4; i++)
{
    (FindControl("lblName" + i.ToString()) as Label).Text = txtName.Text;
}

Pretty sure, anyway.

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Orcun Iyigun11-Mar-11 11:32

Orcun Iyigun

11-Mar-11 11:32

Actually yeah that is what I tried to mean. That should do it thanks anyway though Smile | :)

but why is it dangerous?
I am guessing ;
During looping, when cant find a matching label name, it will throw an exception?

GenJerDan11-Mar-11 14:44

GenJerDan

11-Mar-11 14:44

Yep. There had better be controls to match the loop variable number, or ka-boom!

Also: if, for whatever reason, you ever need the controlks to be set in a certain order...don't count on it. The compiler will do the loop in whichever order it feels is best.

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My Films
My Windows Programs, etc.

Luc Pattyn11-Mar-11 18:18

11-Mar-11 18:18

Not tested, however I expect this should suffice:

for (int i = 0; i < 4; i++) FindControl("lblName" + i).Text = txtName.Text;

as each Control has a Text property, so no need to cast; and ToString() is implicit when appending to a string.

Smile | :)

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GenJerDan12-Mar-11 3:01

GenJerDan

12-Mar-11 3:01

Luc Pattyn wrote:
as each Control has a Text property, so no need to cast

It won't compile.
'System.Web.UI.Control' does not contain a definition for 'Text' and no extension method 'Text' accepting a first argument of type 'System.Web.UI.Control' could be found (are you missing a using directive or an assembly reference?)

Or is there a switch somewhere to "relax" this?

There is water at the bottom of the ocean.
My Mu[sic]
My Films
My Windows Programs, etc.

Luc Pattyn12-Mar-11 3:16

12-Mar-11 3:16

I wrote:
as each Control has a Text property

Sorry, that was wrong. While true for WinForms, it ain't true for System.Web.UI so the cast is required!

Smile | :)

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JOAT-MON11-Mar-11 12:28

JOAT-MON

11-Mar-11 12:28

Regarding 2), I would think you could put something like this in the code behind:

foreach ( Control c in this.Controls )
{
    if ( c is CheckBox )
    {
	( ( CheckBox )c ).Checked = false;
    }
}

Jack of all trades ~ Master of none.

Dalek Dave11-Mar-11 14:13

Dalek Dave

11-Mar-11 14:13

Hve you consodered For Each TextBox?

------------------------------------

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Luc Pattyn11-Mar-11 18:16

11-Mar-11 18:16

No no.

1. For Each is VB, not C#

2. Form.Controls holds all top-level Controls of the Form, no matter what type they are; if one of them isn't a TextBox, foreach will fail to cast it and throw an exception, it does not enumerate just the derived type one is interested in!

Smile | :)

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string.split question

jashimu11-Mar-11 4:59

jashimu

11-Mar-11 4:59

hi All, I am having trouble doing some string manipulation. I get a string with coma delimited. I want remove the first portion of the string.

for example,strMessage = " I, Have, a, string, that, describe, something"
what I want to do is that remove the first coma delimited part of the variable strMessage so it look like this

"Have, a, string, that, describe, something" how do I do this. Any help appreciated.
then I insert the string in my datagridview.

datagridview.Rows.Insert(0,strMessage.Split(','))

I want to keep this style of inserting into dataGridView just want to remove the first portion of the string which is "I".

thanks

Luc Pattyn11-Mar-11 5:12

11-Mar-11 5:12

string.Split() is the method you want; it has a few overloads, so I refer to its documentation.

BTW: you won't solve problems any faster by putting as much as possible into a single statement. Split things up, and look at the intermediate values while debugging.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Dan Mos11-Mar-11 5:18

Dan Mos

11-Mar-11 5:18

this is quite simple for the case you stated. That is just the first comma.

Use IndexOf. Something like:

str.Substring(str.IndexOf(",") + 1).TrimStart();//the TrimStart eliminates the white space after the "I,"

All the best,

Dan

Dalek Dave11-Mar-11 5:19

Dalek Dave

11-Mar-11 5:19

Here[^] is the solution to all your problems.
(Well the ones about splitting, personal probelms are chargeable).

------------------------------------

I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave

CCC Link[^]
Trolls[^]