Architecture :: Passing Exceptions Values Upto The UI
Nov 25, 2010
Most of my DAL functions use structures to pass the data back to the BLL and to the UI. I have got the try catch code now and it all works fine. I capture the exceptions in a seperate db table and it all works fine.I wanted to know how to pass the error up and what varable would be used to hold the error statusWhat I was think was - if I had a BO structure that was used to in the DAL and was populated and I wanted the error state up do I need to have a specific error field in the structure.
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Dec 26, 2011
User will be entering % data in textbox. I am now using filter textbox extender to allow only numbers and .(ie decimal values). I also want the user to enter values from say 1 to 100 only.. How can i do this? If user wants to enter 0.5%?
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Apr 28, 2010
If my web method throws an exception, what is the best practice for passing that exception to the client?
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Jan 26, 2010
I'm building the standard 3-tier ASP.NET web application but I'm struggling as to where to do certain things - specifically handling exceptions.
I've tried to have a look around on the web for some examples but can't find any which go as far as a whole project showing how everything links together.
In my data-tier I'm connecting to SQL Server and doing some stuff. I know I need to catch exceptions that could be raised as a result but I'm not sure where to do it.
From what I've read I should be doing it in the UI tier but in that case I'm not sure how to ensure that the connection to the database is closed. Is anyone able to clarify how to do this? Also if anyone knows as to where I could find an example 3-tier web application that follows best practices that would be great too.
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Jan 21, 2011
Trying to use a dropdownlist to query a database so that it will return all values except 1 (or more in future versions).
For example, assume you had a simple table name "MYFRIENDS" which has two fields named "GROUP" and "NAME" with the following records:
Group
Name
A
John
B
Jane
C
Tony
D
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What I want to do is create a DropDownList that has only 2 list items related to the "GROUP" field. The first list item should return records from the database related to Group A only. Then, the second list item should return all other records EXCLUDING those belonging to Group A.
The drop down list should look something like this (I've put a question mark where I don't know what to do):
[Code]....
After the selection is chosen in the above drop down list, it should query the database and return the desired result. I'm using an AccessDataSource with select parameters. Here's a sample of what that looks like:
[Code]....
Things I've tried that didn't work:
I tried using "Not A" as the the 2nd list item's value. I was thinking p1 would be replaced with the value "Not A" and the query would read "WHERE GROUP LIKE Not A". But, the query syntax "Like Not" is technically wrong. I tried changing the Where Clause to "WHERE GROUP p1" and then replaced the list item's value to "LIKE A" and the second to "NOT LIKE A". Again, I was thinking p1 would be replaced to read "WHERE GROUP LIKE A" and "WHERE GROUP NOT LIKE A". I also tried changing the "SelectCommand" itself so that after the dropdownlist changed, it would first change the selectcommand first and then run the query.
Why the first 2 items didn't work became somewhat obvious to me after thinking about it for a little while. However, I would think the 3rd one would/should work... as long as you have the sequence of events correct which up to this point I haven't been able to figure out.
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Dec 9, 2010
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Mar 18, 2011
I wanted to know if we can pass values from Parent page (in this case from Default.aspx page) to the user control and maintain those values on subsequent "Add/Load" of user control.
So in short, if I click the "Add" button it loads my "webusercontrol" and also I am able to pass my default.aspx dropdownlist value to this dynamically loaded user control and assign it to a "Label or Textbox" which resides in my "webusercontrol", now the problem is that the value doesn't persists! What I meant is , when I click "Add" button again the "webusercontrol" gets loaded again perfectly but now all my "Label's" in webusercontrol has the new selected value from the default.aspx dropdownlist.
So say for instance I have a Dropdownlist in Default.aspx page with Values "Apple, BlackBerry, Nokia" and initial value to be passed is "Apple", I click the "Add" button, now my "Label" inside webusercontrol has the value "Apple", perfect! Next when I click "Add" button again and select a different value to be passed this time say "BlackBerry" now I have 2 webusercontrol loaded on the page, so that means I have 2 "Labels" with different ID's, but now my first Label initially had the value "Apple" because that's what I had passed and now when I passed the value "Blackberry" both the labels of my webusercontrol has the value "BlackBerry" instead of one being "Apple" and another "BlackBerry"
Is there a way to resolve this issue? may be Dictionary List?
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Oct 31, 2010
I am making use of 3-tier architecture.In UI layer, i am getting user input and converting it into XML document. But now question arises that how can i pass this xml document to business and data access layer?
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Mar 30, 2011
I am working on implementing a web application in ASP.Net by following the MVC design pattern (Not ASP.Net MVC). As part of the design, we have entity objects that has only properties as per the corresponding table structure and the idea is using these entity objects in the view layer and the same entity objects are passed to Persistence Layer for saving the data to the database. Business Objects in the business layer are responsible for interacting with the database.
As view creates the entity objects and passes to next layer, what would be the best practice to pass the entity objects to the business layer? Should the business objects accept data objects as parameters and interact with the persistence layer? Is there any other best practice to pass the required objects from the view layer to the next layer? As business objects also need to access the properties of the entity objects passed from the view layer, do we need any "translation" from entity objects to business objects?
the best practices to pass entity objects from view layer to the next layer and also how the entity objects created by the persistence layer can be used by business objects?
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Jan 21, 2010
I have an application that uses DataContracts/DataMembers and Serialization to store information entered in a tab control. There are 8 tabs in the control (therefore 8 aspx pages). The final tab is used to write the information to disk.I am trying to understand: When should serialization be used in a web app? The objects are stored in memory not on disk. Is this another means of passing objects between aspx pages? If so when should serialization be used vs. session objects? How long is the serialized object retained in memory?Can I get a simple example of how to serialize in one page and deserialize the object in another page?I've read many blogs regarding serialization but have yet to find a simple example and none of them explain when serialization should be used vs. session objects?
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Feb 24, 2010
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Feb 3, 2011
I am building an ecommerce site and I struggle to find a way to check the stock levels for each order.I have created an "in house" procedure that involves the administrator having to push a "check stock" button for each item on the order but it doesn'tlook too elegant.
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Oct 26, 2010
I am building an ecommerce site and I struggle to find a way to check the stock levels for each order. I have created an "in house" procedure that involves the administrator having to push a "check stock" button for each item on the order but it doesn't look too elegant.
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Jun 17, 2010
I have a web page that contains a GridView which the user is allowed to "Edit", "Delete" and "Select" rows. What I'm trying to accomplish is when a user clicks on "Edit", they are redirected to another web page that contains a DetailsView of the record they selected from the GridView (previous page). How do I make the association?
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Oct 5, 2010
[Code]....
How can i get the selected item in de dropdown menu in form one, ofter the button submit in the form two is clicked?
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Mar 17, 2010
To pass a textbox value across a page I'm using a property on page1.aspx to pass to page2.aspx which I read using a virtual path. the code
[Code]....
When I fire a postback on page2.aspx, the content of employeeid is 0?
both code above is nested with a If Page.IsPostBack =
False
Then statement
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Jun 5, 2010
I need to pass a dollar amount from one webpageto another webpage without letting the user modify the values when the values are passed between these pages. ie Page 1 (entry page) to Page 2 (confirmation page)
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Apr 7, 2010
i need to pass a long list of Ids from one page to another, i was thinking of using querystring but taking in consideration that the number of ids to be passed may reach 300 i think is not a good idea.an option from my understanding may be the use of session, this seems to me an optimal solution in my case but on the other hand I can certainly clear the session when the user performs a certain action and the list of ids is not longer needed, but if the user leaves the page without performing any action i want to clear the session, how can i do it?f multiple users are using the same functionality do i need the session's items to be confused or the session is for a single user?
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Feb 22, 2010
i want to pass values between forms. wat i did is, I have textbox, a button in form 1 and a label in form 2
1. Created a property to return text of textbox in form 1
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i tried to loop through all controls in previous page to get the value but still its not working.. i wan a simple way.. without using sessions, cookies or anything..
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Feb 28, 2010
here i have a problem,i need to pass the value of one tab to another for tab. For example if i selected a row in the DataGrid based on the DataKeyField of that row i have to display the details in the second tab panel. i tried it but getting a error.
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Nov 12, 2010
I am creating a DataSet to attach to a report (*.rdlc). In the DataSet is a TableAdapter that has the GetData(@start, @end) function. Can someone please explain how I get values in to @start and @end? I have searched and seen that it might have something to do with overriding the Fill function in the DataSet code behind file. Please let me know.
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Jan 30, 2010
I am building a webpage and getting the values entered in textbox from the use now I want to use the values on the next page and want to display the values overthere... I'll explain in detail:
I have a form like below:
Now I want to redirect the user to another page on button click and then use the values of this textbox.
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Nov 1, 2010
I have an ASP.NET Image control declared as:
<asp:Image runat="server" ID="SortOrder"
AlternateText="Ascending"
ImageUrl="~/images/sort_ascending.gif"
CssClass="Ascending"
EnableViewState="true"
/>
[code]...
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Jul 6, 2010
i am using a list view for viewing some information to user there i used a hyperlink in each row to show detailed information in a modal popup in the same page what i want on the click of particular hyperlink the detailed report of that row only should display.
[ID] is the primary key in my database iam passing that as an object from aspx file to the code behind and using that id to fetch data from database. but each time it is showing same information.
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Oct 29, 2010
I need to auto-redirect a page depending on the a ID number in the address bar. When I run this code, It is giving following exception
string temp = Request.Url.ToString();
string subTemp = temp.Substring(temp.IndexOf("ID="));
temp = subTemp.Remove(subTemp.IndexOf("&"));
subTemp = temp.Substring((temp.IndexOf("=") + 1));
Response.Redirect("http://Share1/ncr/Default.aspx?ID=" + subTemp);
Server Error in '/' Application.
StartIndex cannot be less than zero.
Parameter name: startIndex
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentOutOfRangeException: StartIndex cannot be less than zero.
Parameter name: startIndex
Source Error:
[Code]....
Stack Trace:
[Code]....
[ArgumentOutOfRangeException: StartIndex cannot be less than zero.Parameter name: startIndex] System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy) +7494975 TestCodeBehind2.Class4.Page_Load(Object sender, EventArgs e) +69 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +50 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627
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