Re: Datatable problem - ASP.NET Discussion Boards

Re: RecievingDate is neither a DataColumn nor a DataRelation for table .

haleemasher28-Jul-09 18:02

28-Jul-09 18:02

when i run this code it show exception that at same line of code "Exception has been thrown by the target of an invocation." and when from solution explorer i view it in browser it show "RecievingDate is neither a DataColumn nor a DataRelation for table ."

Create class properties on the fly from xml

crystal915428-Jul-09 17:34

crystal9154

28-Jul-09 17:34

I have a Products class. But, I cannot define all the properties of that class because my "automobile" client may have one set, while my "baker" client may have another set. The surest way to keep my webite "Product Management" program flexible for all types of businesses with products is to allow them to enter in text fields what their respective product properties are, and of what type (string, integer, etc), and then have that information written to their own "ClientProductProperties.xml"

Where I am lost is how do I get the node names (property names) and attributes (property types) from any client's "ClientProductProperties.xml" and dynamically create their own unique product class properties without having to have a unique Product class for each client/industry ?

Re: Create class properties on the fly from xml

Mike Ellison28-Jul-09 18:49

Mike Ellison

28-Jul-09 18:49

Wow... that's a pretty tall order (no pun intended)

If you are talking about having an xml file define a custom class (a genuine class that gets compiled with your project) then you are looking at developing a custom build provider. I show an example of this in my GridThemes[^] article.

But you may just as well explore storing an xml document for your "client product properties" in an xml-datatype field in your database. As for parsing the XML, there's lots of examples of doing this... either straight with the System.Xml namespace objects, or through LINQ. If you're looking for examples of that nature, they're pretty easy to find through google, but I could probably dig one or two up also. Let me know.

MishaInTheCloud.blogspot.com

Exception has been thrown by the target of an invocation.

haleemasher28-Jul-09 17:10

haleemasher

28-Jul-09 17:10

when i run this program i got an erroe "Exception has been thrown by the target of an invocation."
how to debug it?

        <asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
            AutoGenerateColumns="False" CellPadding="4" 
            DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None" 
            style="z-index: 1; top: 413px; left: 285px; position: absolute; height: 172px; width: 476px; margin-right: 88px" 
            onrowcancelingedit="GridView1_RowCancelingEdit" 
            OnRowUpdating="UpdateRecord" 
            onrowediting="GridView1_RowEditing" PageSize="5">
            <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <RowStyle BackColor="#E3EAEB" />
            <Columns>
            
               <asp:TemplateField HeaderText="Date" HeaderStyle-HorizontalAlign="Left" SortExpression="RecievingDate">
               <ItemTemplate >
               <asp:Label ID="lbl1" runat ="server" Text ='<%# Bind("[RecievingDate]") %>'></asp:Label>               </ItemTemplate>

 <EditItemTemplate>
   <asp:TextBox ID="txtDate" Width="100px" runat="server" Text='<%# Bind("[RecievingDate]") %>'></asp:TextBox>
 </EditItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Coupon" SortExpression="CouponName">

 <EditItemTemplate>
  <asp:TextBox ID="txtcoupon"  Width="100px" runat="server" Text='<%# Bind("[CouponName]") %>'></asp:TextBox>
 </EditItemTemplate>

  <ItemTemplate>
    <asp:Label ID="lblcoupon1" Width="100px" runat="server" Text='<%# Bind("[CouponName]") %>'></asp:Label>
  </ItemTemplate>
  
</asp:TemplateField>

<asp:TemplateField HeaderText="Serial Start" SortExpression="Serial_Start">
  <EditItemTemplate>
   <asp:TextBox ID="txtstart"  Width="100px" runat="server" Text='<%# Bind("[Serial_Start]") %>'></asp:TextBox>
  </EditItemTemplate>

   <ItemTemplate>
     <asp:Label ID="lblstart1"  Width="100px" runat="server" Text='<%# Bind("[Serial_Start]") %>'></asp:Label>
   </ItemTemplate>
</asp:TemplateField>


<asp:TemplateField HeaderText="End" SortExpression="Serial_End">

         <EditItemTemplate>
            <asp:TextBox ID="txtend" Width="100px" runat="server" Text='<%# Bind("[Serial_End]") %>'></asp:TextBox>
         </EditItemTemplate>

         <ItemTemplate>
            <asp:Label ID="lblend1" Width="100px" runat="server" Text='<%# Bind("[Serial_End]") %>'></asp:Label>
         </ItemTemplate>
   
      
</asp:TemplateField>

        <asp:TemplateField HeaderText="Recieved By" SortExpression="Recieved_By">

            <EditItemTemplate>

                <asp:TextBox ID="txtby" Width="100px" runat="server" Text='<%# Bind("[Recieved_By]") %>'></asp:TextBox>

            </EditItemTemplate>

   <ItemTemplate >

       <asp:Label ID="lblby1" Width="100px" runat="server" Text='<%# Bind("[Recieved_By]") %>'></asp:Label>

   </ItemTemplate>


</asp:TemplateField>




               
<asp:TemplateField HeaderText="Edit" ShowHeader="False"> 
<EditItemTemplate> 

<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton> 

<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"></asp:LinkButton> 

</EditItemTemplate> 
<ItemTemplate> 

<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit"></asp:LinkButton> 

</ItemTemplate>
</asp:TemplateField>

            </Columns>
            
            <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
            <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
            <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" 
                Height="4px" />
            <EditRowStyle BackColor="#7C6F57" />
            <AlternatingRowStyle BackColor="White" />
        </asp:GridView>

Datatable problem

Jagz W28-Jul-09 16:41

Jagz W

28-Jul-09 16:41

i have created a datatable containing one column autoincremented true.

i bind this table to gridview with autoincremented column as sno.

now my problem is when user delete one the row in gridview then order of sno number goes wrong.

what is solution of this problem

One person's data is another person's program.

--J.Walia

Re: Datatable problem

N a v a n e e t h28-Jul-09 16:46

N a v a n e e t h

28-Jul-09 16:46

You don't need an auto-increment column just to show the serial number. Try the following instead.

<%#Container.DataItemIndex+1 %>

Put the above in a template column.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Re: Datatable problem

Jagz W28-Jul-09 16:49

Jagz W

28-Jul-09 16:49

thanks for quick reply

you mean there is no need to bind autoincremented column to grid view

One person's data is another person's program.

--J.Walia

Re: Datatable problem

Abhijit Jana28-Jul-09 17:52

Abhijit Jana

28-Jul-09 17:52

Yes ! Because you can't use Autoincrement no as serial No. Supopose, you have 1,2,3,4,5 ID in table and you delete 4. If you again insert any recored, then new record ID should be 6. Not 5.
So, Do as navaneeth suggested . Big Grin | :-D

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.
View My Latest Article

How to bypass ISA Server programmatically?

just3ala228-Jul-09 8:02

just3ala2

28-Jul-09 8:02

Dear All,
I have two web applications one behind ISA and the other is accessible directly
How can I send the credentials to ISA login page and go directlty to the first web application?
I can connect using HttpWebRequest with the credetials and get the response but when I redirect to the web application I'm asked for the credentials again.

Best Regards
3ala2 Smile | :)

Web page is not runing!!!!!

zeeShan anSari28-Jul-09 7:51

zeeShan anSari

28-Jul-09 7:51

hi all

,
In local host my web site working well.So i publish the website and upload the every file from publish folder to the server through cuteftp.when i run the website then

Server Error in '/' Application.
Runtime Error

shows on my default page........can anybody tell me where is problem.
thanks

Re: Web page is not runing!!!!!

zeeShan anSari28-Jul-09 8:08

zeeShan anSari

28-Jul-09 8:08

<!--<authentication mode="Windows"/>-->
Line 59: 
Line 60:     <authentication mode="Forms">
Line 61: 
Line 62:       <forms defaultUrl="~/PresentationLayer/Forms/Main.aspx" loginUrl="~/Default.aspx"  >

problem is here

Re: Web page is not runing!!!!!

Abhijit Jana28-Jul-09 8:34

Abhijit Jana

28-Jul-09 8:34

Does you virtual directory configured properly on IIS ?

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.
View My Latest Article

Re: Web page is not runing!!!!!

N a v a n e e t h28-Jul-09 15:50

N a v a n e e t h

28-Jul-09 15:50

Have a look at the Event Viewer.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Design using MVP pattern

Cybernate28-Jul-09 5:15

Cybernate

28-Jul-09 5:15

Hi,
I am trying to implement a site(Read/Update/Delete operations site) using MVP pattern. Also trying to keep the presentation layer UI agnostic(i.e. Presentation layer should work with a Web Client/Windows Client).
Now I have a domain object with around 30 fields/attributes and all of these fields are editable in the UI(View).

I want to propogate the change in any field to the Presentation layer. The only solution I can think of is to define 30 events!!! in the View and 30 handlers in the Presentation layer or define 30 setter methods in the presentation layer for the 30 event handlers in the view.

Am not comfortable with this design.
Can any one provide me a solution or a direction on this?

Regards,
Cybernate

Re: Design using MVP pattern

Jeremy Likness28-Jul-09 9:22

Jeremy Likness

28-Jul-09 9:22

First, why should the presentation layer work in two different presentation models?

You mean the controller?

I can see this:

Model <shared>
Controller <shared>
View - one instance for web, one instance for web form

That makes more sense to me.

I'm also assuming your changes are to "something" not just random fields, but fields that belong to an object.

So why not maintain the original object state in the controller:

Controller<T> where T: class

T _state;

Have a typed args, something like:

public class TypedArgs<T> : EventArgs where T: class
{
public T Value { get; set; }
}

Create an interface for your views:

public interface IView<T> where T: class
{
event EventHandler<TypedArgs<T>> Changed;
}

then you can raise Changed with the new entity in the view, and have the controller register. Just pass in IView to the controller so it doesn't care if it's a user control or a web form, and when Changed is raised, it can compare e.Value to the stored state and decide what to do.

Jeremy Likness
Latest Article: Hierarchal Data Templates in Silverlight
Blog: C#er : IMage

Re: Design using MVP pattern [modified]

Cybernate28-Jul-09 9:54

Cybernate

28-Jul-09 9:54

Thanks Jeremy.
I tried to provide my question with an example.

I have a scenario where I have to display a view with around 30 fields(some are textboxes and some are Dropdowns) and the Business Object to represent the entity would be something like:
[CODE]
Parent
{
PField1
PField2
.
.
.
.
PField19
PField20

List<Son> Sons;
List<Daughters> Daughters;
}

Son
{
SField1
SField2
SField3
}

Daughter
{
DField1
DField2
DField3
DField4
DField5
}
[/CODE]

Am capturing/displaying the whole business entity in a single view.

Now the user can change the base fields of a parent or change the fields of a son/daughter.

Now how should I handle the change events for each field in the view, should I delegate the change events to the Presenter and then let presenter update the view. This requires to define 22 events in the View and then 22 delegate events in view and 22 event handlers in the presentation layer.

Somehow am not having a good feeling about this design.

Can you please advise?

Regards,
Cybernate

modified on Tuesday, July 28, 2009 4:01 PM

Re: Design using MVP pattern

N a v a n e e t h28-Jul-09 15:55

N a v a n e e t h

28-Jul-09 15:55

AFAIK, MVP is not well suited for web-applications. It works well with stand-alone applications. You may try the MVC model. ASP.NET has a MVC framework available. Give it a try.

Cybernate wrote:
I want to propogate the change in any field to the Presentation layer. The only solution I can think of is to define 30 events!!! in the View and 30 handlers in the Presentation layer or define 30 setter methods in the presentation layer for the 30 event handlers in the view.

That is ugly. You can have only one method in the presentation layer which takes an aggregate data structure and does the UI binding. Read this[^] MSDN article which takes MVP pattern in detail.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Re: Design using MVP pattern

Cybernate28-Jul-09 16:21

Cybernate

28-Jul-09 16:21

Thanks for your inputs.
I am not sure if I agree with you on MVP not suited for Web Apps.
Regarding the 30 Events statement I was being sarcastic.
Thanks for trying though.

Regards,
Cybernate

user availability

gora1234528-Jul-09 4:43

gora12345

28-Jul-09 4:43

hi guys...
i want to make a user availability control in a ajax enabled asp.net website

so i placed a textbox & a label(which shows the username exists or not ) inside the updatepanel

i use a button(placed outside updatepanel) as a trigger for asynchronous postback of the updatepanel

all works fine ...but the page is reloaded.....i mean the user have to wait a few seconds for the output...

but i want it asynchronously ...so the total page is not updated...

help me .....

Re: user availability

Vimalsoft(Pty) Ltd28-Jul-09 4:49

Vimalsoft(Pty) Ltd

28-Jul-09 4:49

Make sure that the Updatepanel updatemode is "Conditional" and set your textbox autopostback to "true"

Vuyiswa Maseko,

Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/

Re: user availability

gora1234528-Jul-09 5:32

gora12345

28-Jul-09 5:32

i have done this all....
but still the pasge is reloaded....invisible for a little time & then shows the output

Re: user availability

Vimalsoft(Pty) Ltd28-Jul-09 20:07

Vimalsoft(Pty) Ltd

28-Jul-09 20:07

can i see the markup

pls help

jude mgbaka28-Jul-09 4:19

jude mgbaka

28-Jul-09 4:19

pls i was running an application ,when i clicked on a radio button,it threw a java script error "object expected and i need it resolved

Re: pls help

Abhijit Jana28-Jul-09 4:21

Abhijit Jana

28-Jul-09 4:21

jude mgbaka wrote:
when i clicked on a radio button,it threw a java script error "object expected and i need it resolved

It means object is not found. Please show us the code.

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.
View My Latest Article

Re: pls help

Vimalsoft(Pty) Ltd28-Jul-09 4:22

Vimalsoft(Pty) Ltd

28-Jul-09 4:22

We cant know until we see the code Smile | :)

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