Changing amount of a const variable at the run time ! - C# Discussion Boards

8-Apr-09 2:54

Hi,

I need to use the System.Printing.Activation dll bu I'm unabled to find it in the .NET Framework 3.5 in my VS 2008 environnement

I was searching on the net but I can't find it and I saw no other case like mine. Did somebody have tehe same problem I have.

Please help me.

Regards.

tom5720078-Apr-09 2:56

8-Apr-09 2:56

I just found an answer. This dll is include into the ReachFramework.dll

thanks.

EliottA8-Apr-09 2:57

EliottA

8-Apr-09 2:57

This namespace is found in these assemblies:
System.Printing.dll

Check out the CodeProject forum Guidelines[^]

tom5720078-Apr-09 2:59

8-Apr-09 2:59

not exactly, i needed to add a reference to the ReachFramework.dll because the System.Printing.dll doesn't contain it

EliottA8-Apr-09 3:01

EliottA

8-Apr-09 3:01

Perhaps it was once in System.Printing.dll before, This[^] was one of 2 hits from google for "System.Printing.Activation" (with quotes), but I guess you're right, good find!

Check out the CodeProject forum Guidelines[^]

EliottA8-Apr-09 3:02

EliottA

8-Apr-09 3:02

Ahh A little more searching took me to here,[^] which shows the dll you spoke of also listed as containing that namespace.

Good job

Check out the CodeProject forum Guidelines[^]

tom5720078-Apr-09 4:02

Changing amount of a const variable at the run time !

8-Apr-09 4:02

Thank you for your interest and your involvement.

Mohammad Dayyan8-Apr-09 2:52

Mohammad Dayyan

8-Apr-09 2:52

Hi.

I wanna know , Can we change amount of a const variable at run time for ever.
I mean , when we change the amount, it will be firm even after closing and running the Application again.

Thanks

Re: Changing amount of a const variable at the run time !

MNantu8-Apr-09 3:23

MNantu

8-Apr-09 3:23

You can use readonly instead of const and you can save that value in an XML file, txt, database etc.

Hope this helps Smile | :)

Re: Changing amount of a const variable at the run time !

King Julien8-Apr-09 3:28

King Julien

8-Apr-09 3:28

Hi,
I believe changing a CONST type in the runtime is merely impossible... because its a compile-time constanst...

If you want to assign a value at runtime only for once and after if you want to deny any changes then you can use readonly.

However all this concepts are valid only when the assembly is loaded in to the memory.. means only while the application is running.... Once the application is stopped then, all the variables and objects in the program is lost whatever the type(CONST or ReadOnly doesnt matter).

If you want to retain the changes even after the application is closed, then saving the data in a separate file and accessing it, as and when required is the possible solution.

Have a Happy Coding.....

Re: Changing amount of a const variable at the run time !

Phil J Pearson8-Apr-09 4:48

Phil J Pearson

8-Apr-09 4:48

You can distribute the source file with the application, include some code to parse the source, find the text where the const variable is defined and change it. Then your program merely has to rebuild itself, exit and start the new version. Laugh | :laugh:

Phil

The opinions expressed in this post are not necessarily those of the author, especially if you find them impolite, inaccurate or inflammatory.

Totaling and averaging column in datagridview [modified]

Martin310888-Apr-09 2:47

Martin31088

8-Apr-09 2:47

Hi guys,

I've got a windows form with a datagridview linked to an access database. The third column in the datagridview is a list of numeric values. On load up I would like a textbox to display the average of all the values in this column. Can't quite figure it out.

Here's the code I have written:

<br />
int Counter = 0;<br />
double AverageCalc = 0;<br />
<br />
while (Counter < datagridview.Rows.Count)<br />
{<br />
    string Average = null;<br />
    Average = datagridview.SelectedRows[Counter].Cells[2].Value.ToString();<br />
    AverageCalc = AverageCalc + Convert.ToDouble(Average);<br />
    Counter++;<br />
}<br />
<br />
AverageCalc = AverageCalc / datagridview.Rows.Count;<br />
txtAverage.Text = AverageCalc.ToString();<br />

It loops through once, and then fails at:
Average = datagridview.SelectedRows[Counter].Cells[2].Value.ToString();
When Counter = 1

I'm not really sure what else to try, any advise would be greatly appreciated.
Thanks
Martin

modified on Wednesday, April 8, 2009 9:24 AM

Dino Mulahusic8-Apr-09 3:30

Dino Mulahusic

8-Apr-09 3:30

its because you have only one row SELECTED and you are looping through all rows in datagridview

try

Average = datagridview.Rows[Counter].Cells[2].Value.ToString();

to loop through all rows
or

while (Counter < datagridview.SelectedRows.Count)

to loop only through selected rows

MNantu8-Apr-09 3:37

MNantu

8-Apr-09 3:37

Oops I missed that out Blush | :O

Martin310888-Apr-09 3:40

Martin31088

8-Apr-09 3:40

Thanks alot, I knew it would be something simple like that.

Populating ComboBox with "ALL" option

MNantu8-Apr-09 3:35

MNantu

8-Apr-09 3:35

It fails because ?

What is the exception ? Smile | :)

jimish18-Apr-09 2:26

jimish1

8-Apr-09 2:26

Hi,
I have a combo box which I am populating dynamically using Datatables.
The combobox acts as a selection point from where a user selects a value and accordingly charts are generated..!
The column i am populating changes dynamically and is never the same.
Now I want to add another option "ALL" in the combo box after/before I populate the combobox...such that my combo box should have all the values frm table as well as an item " ALL " I tried doing it, but it shows error.

Can anyone help me out please. how should i go abt it..?
I am making a Windows Application using C#.

Cheers

Jimish

Noah Wollowick8-Apr-09 2:35

Noah Wollowick

8-Apr-09 2:35

One thing you could do is to modify the SQL query so that 'ALL' is in the datatable.

I.e. " SELECT Value1 FROM Table1 UNION ALL SELECT 'ALL' "

Then the option value will be in the datatable and you can select it.

jimish18-Apr-09 2:42

jimish1

8-Apr-09 2:42

Query input must contain at least one table or query.

It shows the above error..!

Jimish

Sun Rays8-Apr-09 2:49

Sun Rays

8-Apr-09 2:49

Hi,
After binding your datatable / dataset to Combobox. Add below line.

cmBOX.Items.Insert(0,"ALL");

Thanks,
Sun Rays

To get something you must have to try once.

My Articles