ref and out [modified] - C# Discussion Boards

KabirPatel3-Oct-08 4:38

3-Oct-08 4:38

Hi,

I have a windows form that contains 2 buttons - a "Next" button and a "Prev" button.

When the form loads, a user control is loaded into the form. After the user presses the "Next" button, the user control is replaced by another user control. If the user presses the "Prev" button they move back to the prevous control. The process continues like this until 5 different user controls are loaded. i.e. I have implemented Wizard like functionaility.

This all works fine.

My problem is that the "Next" and "Prev" buttons are always enabled. I would only like the "Next" button to be enabled if the user has completed working on the User Control that they are currently on.

In other words, once a user has completed the minimum requirements of the control they are in, the "Next" button should become enabled.

An example of this would be a user control with a first name field. When the user fills in this field the "Next" button should be enabled.

Is it possible for the user control to bubble up this information back to its parent form, so that the button is enabled at the proper time?

Thanks,
Kabir

Re: Communicating with user controls

Pedram Behroozi3-Oct-08 5:00

Pedram Behroozi

3-Oct-08 5:00

Hi Kabir
You can use a public bool variable (true/false) in your UC. When user fills a valid text, your flag goes true, else false. And your form can use your flag to complete your task.

While (true) { Human.isLearnable = true; }

Re: Communicating with user controls

nelsonpaixao3-Oct-08 13:13

nelsonpaixao

3-Oct-08 13:13

if you are using delegates i don´t see how you didn´t achieve that after what you already coded?! D'Oh! | :doh:

parent form? you meen main_form and only form right? because you load usercontrols in main_form? i don´t see where is the change Dead | X|

nelsonpaixao@yahoo.com.br

trying to help & get help

excel cell alignment

michael_jhons3-Oct-08 4:04

michael_jhons

3-Oct-08 4:04

hello everybody
can somebody help me in formating excel cells inside a worksheet:
i tried

worksheet.get_Range(worksheet.Cells[2, 1], worksheet.Cells[2, 3]).HorizontalAlignment = HorizontalAlignment.Left;

but gave me an error i made a research i found that i have to use

... HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter

the problem is that i couldn't find XlHAlign property i tried many reference but without any solution.

thank you in advance and kind regards

Re: excel cell alignment

Pedram Behroozi3-Oct-08 4:50

Pedram Behroozi

3-Oct-08 4:50

michael_jhons wrote:
but gave me an error i made a research i found that i have to use

... HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter

But it worked for me! Confused | :confused:

It's my code:

using System;
using System.Text;
using Microsoft.Office.Interop.Excel;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            WorksheetClass ws = new WorksheetClass();
            ws.get_Range(ws.Cells[2, 1], ws.Cells[2, 3]).HorizontalAlignment = XlHAlign.xlHAlignCenter;
        }
    }
}

While (true) { Human.isLearnable = true; }

Re: excel cell alignment

michael_jhons5-Oct-08 21:31

michael_jhons

5-Oct-08 21:31

thank you pedram, it was the

using Microsoft.Office.Interop.Excel;

i added as a reference but when i added from using XLHalign apears, thank you fro your help

Re: excel cell alignment

minhlao21-Mar-09 17:14

minhlao

21-Mar-09 17:14

Range rng = objSheet.getRange(col1, row1,col2 ,row2);
rng.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;

Wink | ;)

enjoy it

soicodon : mihazu_undead@yahoo.com

ref and out [modified]

DaveyM693-Oct-08 1:29

DaveyM69

3-Oct-08 1:29

Am I correct in thinking that the only difference is:

ref has to be preassigned but does not have to be used in the method
out must be assigned before returning but can be unassigned before calling the method
?

Are there any notable benifits of using either one?

[edit] Just discovered that if using out, the parameter is treated as if it is unassigned (even if it's already been assigned) as soon as you call the method. So it appears that ref is kind of an input and output parameter whereas out is just output.[/edit]

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

modified on Friday, October 3, 2008 7:37 AM