CalcBalance does not exist in the current context - C# Discussion Boards

Re: display folder path in dialog text box

Jun Du10-Jul-06 10:05

10-Jul-06 10:05

Indeed. Asking for answers without try does not benefit students at a long run. It looks like a side effect of forum.

Best,
Jun

Re: display folder path in dialog text box

Nader Elshehabi10-Jul-06 13:49

Nader Elshehabi

10-Jul-06 13:49

Hello guys, Jun, Christian Smile | :)

Well, why don't we help the newbies with code snippets? This would encourage them, and give them a head start, wouldn't it?

I mean.. Is it "cheating" if we help them with a line or two, just as an assistance in their projects? I don't endorse it as a habit, yet I think they sometimes deserve more help than mere general guidance don't you agree? Smile | :)

Regards

Re: display folder path in dialog text box

Jun Du10-Jul-06 15:32

Jun Du

10-Jul-06 15:32

Yes, by all means. We should help those who have tried, not those who just pass the assignment to us.

Best,
Jun

Re: display folder path in dialog text box

Nader Elshehabi10-Jul-06 16:20

Nader Elshehabi

10-Jul-06 16:20

Well, it sounds fair enough for me. Cool | :cool:

Thanks Jun.

Regards Rose | [Rose]

Re: display folder path in dialog text box

Josh Smith10-Jul-06 10:37

Josh Smith

10-Jul-06 10:37

x2pca wrote:
Please help me with the code since i have to deliver my application by tomorrow evening.

Yeah right!!

If you're a student, get used to the fact that nobody is going to do your job for you. Nobody.

If you are already in the industry, why have you not figured that out yet?!?!?!?!?! Poke tongue | ;-P

Good luck. The clock is ticking...

:josh:
My WPF Blog[^]

Dataset copy

Small Rat10-Jul-06 8:36

Small Rat

10-Jul-06 8:36

hi,

I create a dataset and fill it with access database. everything is fine, I can see the data in the binded grid control. but i have an exception when I do the copy operation. the exception says, the dataset can not pass the constrains (non null, foreign key...).

I think I can not create the first dataset if the data is wrong?

does anyone have idea about this?

Thanks a lot!

Alan Shen

MCAD for .NET Version
^~^~^~^~^~^~^~^~^~^~^
Great idea is the beginging of success!

Re: Dataset copy

Josh Smith10-Jul-06 8:40

Josh Smith

10-Jul-06 8:40

DataTable has two methods, BeginLoadData and EndLoadData, which can be used when copying data into the table to prevent constraints from being enforced temporarily. Try using those when copying the data.

:josh:
My WPF Blog[^]

CalcBalance does not exist in the current context

Skanless10-Jul-06 7:09

Skanless

10-Jul-06 7:09

I am coding a interest calculator in C# using Visual Studio 2005 Express edition and I keep on getting the following error: "CalcBalance does not exist in the current context". I am not sure what's cuasing it or how to fix it. Any advice which would help in get this code working would be greatly appreciated. Below is the full code:

<%@ Control Language="C#" ClassName="WebUserControl" %>

protected void Button1_Click(object sender, EventArgs e)
{
Label6.Text = "Final Balance: $" +
CalcBalance(Convert.ToInt32(TextBox1.Text),
(Convert.ToInt32(TextBox2.Text) / 100),
Convert.ToInt32(TextBox3.Text),
Convert.ToInt16(DropDownList1.SelectedItem.Value)).ToString();
}

private string CalculateBalance(int Principal, double Rate, int Years, int Period)
{
double result;
double NumToBeRaised = (1 + Rate / Period);
result = Principal * System.Math.Pow(NumToBeRaised, (Years * Period));
return (result.ToString("C"));
}

<asp:label id="Label1" runat="server" style="position: relative" text="Compound interest Calculator" width="318px" font-bold="True" font-size="Large">

<asp:label id="Label2" runat="server" style="position: relative" text="Principal ($)" width="165px">
<asp:textbox id="TextBox1" runat="server" style="position: relative">

<asp:label id="Label3" runat="server" style="position: relative" text="Rate (%)" width="165px">
<asp:textbox id="TextBox2" runat="server" style="position: relative">

<asp:label id="Label4" runat="server" style="position: relative" text="Years:" width="165px">
<asp:textbox id="TextBox3" runat="server" style="position: relative">

<asp:label id="Label5" runat="server" style="position: relative" text="Compound Frequency:" width="165px">
<asp:dropdownlist id="DropDownList1" runat="server" style="position: relative">
<asp:listitem value="1">Annually
<asp:listitem value="4">Quarterly
<asp:listitem value="12">Monthly
<asp:listitem value="365">Daily
<asp:listitem>

<asp:button id="Button1" runat="server" style="left: 9px; position: relative; top: 10px"
="" text="Calculate" width="207px" onclick="Button1_Click">

<asp:label id="Label6" runat="server" style="position: relative" width="165px">

Greg

The Belizean Dan Dada!!!

Re: CalcBalance does not exist in the current context

Robert Rohde10-Jul-06 7:42

Robert Rohde

10-Jul-06 7:42

Are you kidding?
You are calling a function named CalcBalance but you have defined one with the name CalculateBalance. Do you see the difference?

Re: CalcBalance does not exist in the current context

LongRange.Shooter10-Jul-06 8:26

LongRange.Shooter

10-Jul-06 8:26

protected void Button1_Click(object sender, EventArgs e)
{
     Label6.Text = "Final Balance: $" + 
       CalcBalance(Convert.ToInt32(TextBox1.Text),
       ^^^^^^^^^^^ -- LOOK AT WHAT YOU TYPED HERE  :~ 
      (Convert.ToInt32(TextBox2.Text) / 100),
       Convert.ToInt32(TextBox3.Text),
       Convert.ToInt16(DropDownList1.SelectedItem.Value)).ToString();
}

private string CalculateBalance(int Principal, double Rate, int Years, int Period)
                   ^^^^^ - NOW LOOK AT WHAT YOU TYPED HERE :omg:
{
       double result;
       double NumToBeRaised = (1 + Rate / Period);
       result = Principal * System.Math.Pow(NumToBeRaised, (Years * Period));
       return (result.ToString("C"));
}

Re: CalcBalance does not exist in the current context

wasife10-Jul-06 8:28

wasife

10-Jul-06 8:28

By looking at your code, it seems as CalculateBalance(...) is the function that actually calculates the interest but you are using CalcBalance instead of CalculateBalance(...) as the name of the function.

If the name of the interest calculating function is actually CalcBalance, then this error might be because CalcBalance is not in the current class.

Regards,
Wasif Ehsan

Re: CalcBalance does not exist in the current context

Josh Smith10-Jul-06 8:37

Josh Smith

10-Jul-06 8:37

wasife wrote:
If the name of the interest calculating function is actually CalcBalance, then this error might be because CalcBalance is not in the current class.

"this error might be..." You are too kind, Wasif Laugh | :laugh:

:josh:
My WPF Blog[^]

Re: CalcBalance does not exist in the current context

Skanless10-Jul-06 16:37

Skanless

10-Jul-06 16:37

Thanks, Guys I really apprecaite the tip. I changed the name and it worked. This code was written directly from a microsoft book, as is, so i took it for granted that i was doin something wrong................what a dork. Thanks again. I knew I can rely on you guys for assistance.

Greg

The Belizean Dan Dada!!!

Re: CalcBalance does not exist in the current context

J4amieC10-Jul-06 21:57

J4amieC

10-Jul-06 21:57

Which just goes to proove:

1) Technical writers/editors make mistakes too
2) Dont believe everything you read without verifying it

Current blacklist
svmilky - Extremely rude | FeRtoll - Rude personal emails | ironstrike1 - Rude & Obnoxious behaviour

Show the "video capture filter " form in c#

davilovick10-Jul-06 6:54

davilovick

10-Jul-06 6:54

Hi, i'm trying to show the "video capture filter" or "video source" form to configure the webcam parameters.
How can i do that??

Very thanks. Sorry, I'm Spanish.

www.studios-tortuga.com

Re: Show the "video capture filter " form in c#

LongRange.Shooter10-Jul-06 8:21

LongRange.Shooter

10-Jul-06 8:21

You probably should begin by reading Chris' article on how to get answers to your questions. It is really unclear as to what you are asking here! If you believe there is some kind of dialog in .NET to display this video source form, you are very wrong. You will have to write this yourself. If it is a feature within a webcam piece of hardware, then you need to look into the webcam SDK and determine how to interact with this in your program. Contacting the webcam manufacturer will help along these lines.

Re: Show the "video capture filter " form in c#

Malcolm Smart10-Jul-06 20:53

Malcolm Smart

10-Jul-06 20:53

It's ok to be Spanish. Don't apologise. Now, if you were Welsh....that's a different question.

Regards

Angel
*********************************************
The sooner you fall behind, the longer you have to catch up.

OdbcCommand not taking

HahnTech10-Jul-06 6:21

HahnTech

10-Jul-06 6:21

I’m having troubles with the following code:

txtSelect.Text = “Select System_id From [DFIParmsHTS].[docsadm].[ExtGroup] where CustNumber = _CustomerNumber”
OdbcCommand cmdSelect= new OdbcCommand(txtSelect.Text, conn);
cmdSelect.CommandType=CommandType.Text;
cmdSelect.Parameters.Add("_CustomerNumber", vfx.TNM);
dr = cmdSelect.ExecuteReader();

Throws SQLSRV32.DLL - ERROR [42S22] [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid column name '_CustomerNumber'

No kidding _CustomerNumber is an Invalid Column name. I’m trying to replace it with vfx.TNM. If I look at the Command object in the watch window Parameters.items[0].parametername = “_CustomerNumber” and Parameters.items[0].Value = “000122”

So why isn’t it getting to the db that way.

I’ve also tried

txtSelect.Text = “Select System_id From [DFIParmsHTS].[docsadm].[ExtGroup] where CustNumber = @CustomerNumber”
OdbcCommand cmdSelect= new OdbcCommand(txtSelect.Text, conn);
cmdSelect.CommandType=CommandType.Text;
cmdSelect.Parameters.Add("@CustomerNumber", vfx.TNM);
dr = cmdSelect.ExecuteReader();

Throws SQLSRV32.DLL - ERROR [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Must declare the variable '@CustomerNumber'

So to me it looks like the Command isn’t committing the changes of the parameters to the query. That made me try:

txtSelect.Text = “Select System_id From [DFIParmsHTS].[docsadm].[ExtGroup] where CustNumber = @CustomerNumber”
OdbcCommand cmdSelect= new OdbcCommand(txtSelect.Text, conn);
cmdSelect.CommandType=CommandType.Text;
cmdSelect.Parameters.Add("@CustomerNumber", vfx.TNM);
cmdSelect.Prepare();
dr = cmdSelect.ExecuteReader();

And that didn’t work either.

Any help is appreciated, Thanks.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

Not Active10-Jul-06 6:50

Not Active

10-Jul-06 6:50

First question would be why are you using OdbcCommand rather than SqlCommand? It appears you are connecting to a Sql Server database.

Re: OdbcCommand not taking

HahnTech10-Jul-06 10:16

HahnTech

10-Jul-06 10:16

Well some sites use MS SQL others use Postgrsql. When you write code that is flexible and not just MS you can't always take the easy way.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

Not Active10-Jul-06 11:33

Not Active

10-Jul-06 11:33

True enough. You didn't mention anything about the databases you were using. From the evidence you provided it seemed only SQL Server.

You might want to look at the Microsoft Enterprise Library and the Data Application block to assist in writing a more generic data access layer.

Re: OdbcCommand not taking

HahnTech10-Jul-06 13:23

HahnTech

10-Jul-06 13:23

Thanks for the link. I need all the help i can get with this two DBS thing.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

Colin Angus Mackay10-Jul-06 12:20

Colin Angus Mackay

10-Jul-06 12:20

HahnTech wrote:
Well some sites use MS SQL others use Postgrsql. When you write code that is flexible and not just MS you can't always take the easy way

Ummm.....

You are going to have to write different SQL queries anyway for each database because of the differences in the way SQL is implemented in each database. If you write a proper DAL (Data Access Layer) you can swap in and out the DAL depending on the datbase you are using. The rest of the application uses interface(s) to the DAL, so both have the same public methods. However, inside each of the DAL classes the datbase code is optimised for the appropriate database.

Scottish Developers events:
* .NET debugging, tracing and instrumentation by Duncan Edwards Jones and Code Coverage in .NET by Craig Murphy
* Developer Day Scotland: are you interested in speaking or attending?
My: Website | Blog

Re: OdbcCommand not taking

Guffa10-Jul-06 7:06

Guffa

10-Jul-06 7:06

Parameters in ODBC don't have names. Use "?" in the query to identify the parameters, and add the parameters to the parameter collection in the same order as they appear in the query.

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

Re: OdbcCommand not taking

HahnTech10-Jul-06 10:19

HahnTech

10-Jul-06 10:19

Cool Thanks for the help. I Guess I'm going to just to Replace() on the input string then. The attraction of using parameters was that it allowed a bit of latitude in how the sql strings where made.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

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