how to display numbers in words - ASP.NET Discussion Boards

MarkMokris9-May-09 4:38

9-May-09 4:38

I have been more of a C# desktop programmer. This is a pretty fundamental ASP.NET question.

I realize that all post-backs to a ASP.NET page cause the page to be reloaded. Therefore:

1. Any variables I create global to the page class will be re-initialized with each post-back. Is that correct?

2. Does that mean that nothing really persists from post-back to post-back?

3. What about if I set up a SQLDataSource at design time and bind it to a GridView. Is the SQLDataSource reconnecting and rerunning the SQL with every post-back? Even post-backs that do not involve the GrdiView?

Thanks,

Mark

Re: Fundamental ASP.NET Question

Christian Graus9-May-09 10:25

Christian Graus

9-May-09 10:25

1 - yes
2 - yes, unless it's static, or stored in the session, the application or viewstate.
3 - Probably. That's at least in part b/c you're writing bad code, putting your database on your form, instead of in a data layer. .NET does do connection pooling, however.

Christian Graus

Driven to the arms of OSX by Vista.

"I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )

Re: Fundamental ASP.NET Question

Abhijit Jana9-May-09 11:17

Abhijit Jana

9-May-09 11:17

MarkMokris wrote:
1. Any variables I create global to the page class will be re-initialized with each post-back. Is that correct?

Yes.

MarkMokris wrote:
2. Does that mean that nothing really persists from post-back to post-back?

Yes and that depends on how you are maintaining the data during postback.

MarkMokris wrote:
What about if I set up a SQLDataSource at design time and bind it to a GridView. Is the SQLDataSource reconnecting and rerunning the SQL with every post-back? Even post-backs that do not involve the GrdiView?

Yes. You have to very much clear about asp.net page lifecycle and PostBack Property.

cheers,
Abhijit
CodeProject MVP
Web Site:abhijitjana.net

Re: Fundamental ASP.NET Question

AlexeiXX39-May-09 17:10

AlexeiXX3

9-May-09 17:10

Abhijit Jana wrote:

MarkMokris wrote:
What about if I set up a SQLDataSource at design time and bind it to a GridView. Is the SQLDataSource reconnecting and rerunning the SQL with every post-back? Even post-backs that do not involve the GrdiView?
Yes. You have to very much clear about asp.net page lifecycle and PostBack Property.

I tought that:

The sql statement wont be executed on every postback, just the first time. On postbacks caused by other controls, the gridview will be regenerated from its view state

If the gridview causes a postback, something like sorting or paging, or you call databind, then it will re execute the sql statement again

Alexei Rodriguez

Re: Fundamental ASP.NET Question

N a v a n e e t h9-May-09 18:18

N a v a n e e t h

9-May-09 18:18

Alexei,

AlexeiXX3 wrote:
The sql statement wont be executed on every postback, just the first time. On postbacks caused by other controls, the gridview will be regenerated from its view state

It depends on how you set DataSource to the GridView. If it is set in the markup, like the below

<asp:GridView ID="grd" runat="server" DataSourceID="sql_ds_id">
   .....
</asp:GridView>

GridView will be regenerated on each postback. You can workaround this by removing the DataSourceID="sql_ds_id" from markup and binding from code when required. Then it will be loaded from ViewState each time. Other way is to enable caching on SqlDataSource.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Re: Fundamental ASP.NET Question

AlexeiXX310-May-09 6:54

AlexeiXX3

10-May-09 6:54

N a v a n e e t h wrote:
GridView will be regenerated on each postback.

It will be regenerated, but not by executing the sql statement again, it will be regenerated from the viewstate. You can use the sql profiler, or just put a breakpoint in the selecting event of the sqldatasource

I have the following code, and it only executes the SQL statement the first time the page is requested but not on postbacks caused a test button on the same page

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
    DataKeyNames="ID" DataSourceID="SqlDataSource1"
    EmptyDataText="There are no data records to display.">
    <Columns>
        <asp:BoundField DataField="ID" HeaderText="ID" ReadOnly="True"
            SortExpression="ID" />
        <asp:BoundField DataField="Name" HeaderText="Name"
            SortExpression="Name" />
    </Columns>
</asp:GridView>

SqlDataSource1 doesnt have caching enabled

Alexei Rodriguez

Re: Fundamental ASP.NET Question

N a v a n e e t h9-May-09 18:24

N a v a n e e t h

9-May-09 18:24

MarkMokris wrote:
Any variables I create global to the page class will be re-initialized with each post-back. Is that correct?

Yes

MarkMokris wrote:
Does that mean that nothing really persists from post-back to post-back?

As Christian said, static variables will be persisted as static variables are destroyed only when the application domain which hosts ends. ASP.NET provides many other persistent mechanisms. Beginners Introduction to State Management Techniques in ASP.NET[^] will get you started.

MarkMokris wrote:
What about if I set up a SQLDataSource at design time and bind it to a GridView. Is the SQLDataSource reconnecting and rerunning the SQL with every post-back? Even post-backs that do not involve the GrdiView?

Yes if caching is not enabled on SqlDataSource. Using SqlDataSource other than academic purpose is not recommended. It forces you to write SQL inside your markup. There are better ways to get data and do binding.

Smile | :)

Navaneeth

How to use google | Ask smart questions

how to display numbers in words

Pawan Kiran9-May-09 3:11

Pawan Kiran

9-May-09 3:11

[Asp.Net 2.0 + C#.Net]

i have 2 textbox controls
assume
TextBox1 is 150
then in
TextBox2 one hundred and fifty
i need to display

suppose
TextBox1 is 19999
then in
TextBox2 Nineteen thousand nine hundred ninety nine
i need to display

how to do,help me out....

Re: how to display numbers in words

Abhijit Jana9-May-09 3:24

Abhijit Jana

9-May-09 3:24

katarukoti wrote:
i have 2 textbox controls
assume
TextBox1 is 150
then in
TextBox2 one hundred and fifty
i need to display

suppose
TextBox1 is 19999
then in
TextBox2 Nineteen thousand nine hundred ninety nine
i need to display

Is this your homework ? Sniff | :^)

cheers,
Abhijit
CodeProject MVP
Web Site:abhijitjana.net

Re: how to display numbers in words

Ramesh Swaminathan9-May-09 3:29

Ramesh Swaminathan

9-May-09 3:29

Check this link[^]

ASPX using third party UI OCX file

The_Collector9-May-09 3:08

The_Collector

9-May-09 3:08

hello everyone...
anybody who can help me how to use a third party OCX in my ASPX... said OCX is a UI and was developed in VB6.
I want to use in in my ASPX(C#) page. I tried to add it as a compnent but it doesn't work.... I need it badly for my new project.... Thanx in advance....

xxx

Re: ASPX using third party UI OCX file

Ramesh Swaminathan9-May-09 3:34

Ramesh Swaminathan

9-May-09 3:34

Since OCX controls are ActiveX objects, you have to embed an OCX object in a web page using object tag.

Check this link:
http://www.fpoint.com/support/whitep/ActiveX/ax1999.aspx#content[^]

Re: ASPX using third party UI OCX file

The_Collector9-May-09 3:49

The_Collector

9-May-09 3:49

I think i have to read the link thoroughly.... this might help me to solve my problemm.... Thank you very much...

xxx

Re: ASPX using third party UI OCX file

The_Collector15-May-09 22:52

The_Collector

15-May-09 22:52

thank you for helping me solve my problem... the links u gave realy helped a lot....

xxx

capture Gridview cell value to an integer variable

Pawan Kiran9-May-09 2:44

Pawan Kiran

9-May-09 2:44

I have a gridview
i want to capture the gridview cell value to a int varible.
i wrote the code as below

int s=0;
for (int i = 0; i < GvFeeTransaction.Rows.Count - 1; i++)
            {
                  CheckBox c = ((CheckBox)(GvFeeTransaction.Rows[i].FindControl("ChkSelect")));
                  if (c.Checked)
                  {
                        if (GvFeeTransaction.Rows[i].Cells[4].Text.Trim() != " ")
                        {
                              s = s + int.Parse(GvFeeTransaction.Rows[i].Cells[4].Text);
                              s = s + Convert.ToInt32(GvFeeTransaction.Rows[i].Cells[4].Text);
                              s =s+(int)(GvFeeTransaction.Rows[i].Cells[4].Text);
                        }
                        else
                        {
                              s = s + 0;
                        }

                  }
            }

nothing is working perfectly means int.parse,convert.toint32,(int)-------
it is showing

Input string was not in a correct format.

i want the sol for this one
i need the answer let me know the exact sol from u.

Re: capture Gridview cell value to an integer variable

Ramesh Swaminathan9-May-09 3:42

Ramesh Swaminathan

9-May-09 3:42

Put a try catch block around this statement
s = s + int.Parse(GvFeeTransaction.Rows[i].Cells[4].Text);

and also put a break point on the catch block. Check whether it returns a value that cannot be converted into a number.

Re: capture Gridview cell value to an integer variable

AlexeiXX39-May-09 17:18

AlexeiXX3

9-May-09 17:18

GvFeeTransaction.Rows[i].Cells[4].Text
It looks right
maybe you are counting the columns wrong
Make sure you dont have any invisible columns, because those columns count as well
The easiest way is to put a breackpoint and try different column indices in the immediate window to check wichone has the correct column
Or try this: GridView1.HeaderRow.Cells[4].Text to see the header text

Alexei Rodriguez

Browse ASP.NET app on windows mobile

sunit_829-May-09 1:03

sunit_82

9-May-09 1:03

My aim is to browse a asp.net app thats hosted in my pc's iis, on my windows mobile browser. For this is use the URL which is something like:
http://MachineName/AppName/default.aspx

The error message I get is, "The Page cannot be displayed or downlaoded because the connection was lost. Check the connction and try again later."

I have a i-Mate PDAL mobile with windows mobile 5.0 and .Net framework 3.5 installed, which i connect to the pc which is hosting the asp.net web app using a USB cable.

Now the queries i have are:

- How does windows mobile resolve urls and how do i set a DNS server for the mobile?
- if i browse to '\\MachineName' on the mobile browser, its shows me the shared folder of my pc on mobile browser. So why it cannot access the web app's url?
- i tried a couple of settings in the Connections settings of the mobile, but didn't work. Any thing specific i need to do?

Thanx.

s.a.w.

Re: Browse ASP.NET app on windows mobile

AlexeiXX39-May-09 17:20

AlexeiXX3

9-May-09 17:20

Try using your PCs IP: 192.168.1.120/Appname/PageName.aspx
And make sure you have a conection, just to make sure, try to open any page like google.com

Alexei Rodriguez

Re: Browse ASP.NET app on windows mobile

sunit_8210-May-09 20:19

sunit_82

10-May-09 20:19

Thanx, for the reply. But it doesn't work using IP either.

s.a.w.

How to select area on a panel

Nekkantidivya9-May-09 0:34

Nekkantidivya

9-May-09 0:34

Hi,

I have a requirement in my project which is to place a panel on a windows form and then to select particular area on it using mouse. then we have to display a image in this selected area on the panel with the selected dimensions.

If anyone have idea to solve this please reply me.

Thanks in advance.

Re: How to select area on a panel

Christian Graus9-May-09 10:29

Christian Graus

9-May-09 10:29

If you can select an arbitrary area in a web app, you can't do it with ASP.NEt, you need javascript.

Re: How to select area on a panel

Yusuf9-May-09 11:15

Yusuf

9-May-09 11:15

Nekkantidivya wrote:
windows form

wrong forum, try this[^]

Yusuf
May I help you?

generate html control object based on the given string

Maxy558-May-09 23:57

Maxy55

8-May-09 23:57

Hi all,

How to generate html control object based on the given string. (string contains the proper html tags, this string is actually generated from rendercontrol function of a webcontrol).

Please help me out on this .

thanks,
Zaki

Re: generate html control object based on the given string

AhsanS9-May-09 0:09

AhsanS

9-May-09 0:09

I am unable to get your question, Can you please elaborate it a bit?

Ahsan Ullah
Senior Software Engineer
MCTS 2.0

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