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Hi,
Considering the scenario for handling exceptions in Web Application where we have Presentation layer, Business layer and Data Access layer; if there any exception is occurred in DAL, what is the best thing to do:
1. Don't catch the exception in DAL and neither in Business Layer, but only in User interface layer.
2.Don't catch the exception in DAL but in Business Layer and throw them to User interface Layer.
3.Catch Exceptions in DAL and throw them to Business Layer which again throws them to User interface layer.
And please suggest me any good exception handling mechanism in these layers.
“You will never be a leader unless you first learn to follow and be led.”
–Tiorio
"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford
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Different exceptions need to be handled differently. For example, if an exception occurs that is caused by the DAL doing something stupid, the DAL should handle it. If the user enters bad data, and it makes it to the DAL(which shouldn't happen) then the DAL should throw one that hits the presentation layer to show the user what happened.
The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo
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Hello forum
I've installed VS 2008 in Vista. It is working but not displaying the page in any browser. Browser is just displaying that the page can not be displayed.
Can anybody tell me what is the solution. what should I do.
Thanx
Rahul Adya
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What page is not showing up? One that you coded? Is IIS installed correctly?
The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo
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check out the url in the displayed web page,
does it look like http://localhost:xxxx/XXXXX ?
ok, try to replace the localhost with 127.0.0.1, to make the url look like
http://127.0.0.1:xxxx/XXXXX and try it, does this work ?
if yes, then the error is from the hosts file, which maps the localhost to 127.0.0.1
which is your local machine's IP address,
to correct that just
go to C:\windows\system32\drivers\etc\hosts
open it with notepad,
and map localhost to 127.0.0.1 with adding this line:
127.0.0.1 localhost
please tell me if this doesn't fix the problem.
Web Developer
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Thanx Friends.
I'll try and surely let u know abt the status.
But do VS 2008 needs IIS.
With warm Regards
Rahul Adya
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Hello,
I am getting above error message. Here is my code which i am using:
...
...
tablename = clsname & exmname & Trim(DropDownList1.Text)
sql = "select * from " & tablename & " where rollno between " & TextBox1.Text & " and " & TextBox2.Text
Dim myr As New CrystalDecisions.CrystalReports.Engine.ReportDocument
Dim ocn As New System.Data.OracleClient.OracleConnection
Dim ods As New System.Data.DataSet
Dim oda As New System.Data.OracleClient.OracleDataAdapter(sql, ocn)
ocn.ConnectionString = "Data Source=orcl;User ID=scott;Password=tiger;Unicode=True"
oda.Fill(ods, tablename)
myr.Load("C:\Inetpub\wwwroot\Exam2\CrystalReport.rpt")
myr.SetDataSource(ods.Tables(0)) ' This is error line.
myr.DataDefinition.FormulaFields("rollno").Text = ods.Tables(0).Rows.Item(0).Item("rollno")
myr.DataDefinition.FormulaFields("dob").Text = ods.Tables(0).Rows.Item(0).Item("dob")
myr.DataDefinition.FormulaFields("name").Text = ods.Tables(0).Rows.Item(0).Item("name")
myr.DataDefinition.FormulaFields("schcode").Text = ods.Tables(0).Rows.Item(0).Item("schcode")
myr.DataDefinition.FormulaFields("centcode").Text = ods.Tables(0).Rows.Item(0).Item("centcode")
CrystalReportViewer1.ReportSource = myr
CrystalReportViewer1.DataBind()
Since i can not give the table name in design time (it will be dynamic); so
I have create a crystal report in which i have created formula fields in the report which will be populated as above code.
Please guide and help me.
Regards
Girish Sharma
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I am developing a webchat application in which I don't want a user to login to the site with same user name. I want first user session to expire when user logs in from other PC to the same site like in Yahoo messenger.List of users who are online is maintained in an array.Can anyone suggest me how to do it? Please help!!!
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If the user is in the array, end the session and start a new one with the new person...
The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo
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How to end previous session???
That is what I want to know...
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Hello,
Page_load event is firing two times, what may be the reason, what is the solution.
Thanks in advance.
Pinna
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Page_Load runs every post back. You can try wrapping the code in a if(!IsPostBack)...
The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo
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Thanks for response..
i wrote the code like that only..if(!IsPostBack)...still page_load is firing two times..
i wrote the code like below..
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Try
If Not IsPostBack Then
lblUserDet.Text = Session("LoginName")
End If
end sub
Pinna
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What makes you think it is firing 2 times?
The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo
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I have two textboxes in my aspx form. One is having SingleMode and the other one is having Multimode.
The issue is font looks like different stlyes in Multimode text box, eventhough both the font styles set to MS SansSerif or Aerial.
Any idea how to make both look like same?
Success is the good fortune that comes from aspiration, desperation, perspiration and inspiration.
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set textbox property Font-Names="Ms SansSerif" in <asp:textbox xmlns:asp="#unknown"> in aspx page
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Hi,
I have a gridview with a textbox template field. On two pages I need this textbox to be enabled but on a third page it must be disabled. What is the best way to do this? My gridview is a user control.
Right now I'm doing this:
<asp:templatefield headertext="Size" xmlns:asp="#unknown">
<itemtemplate>
<asp:textbox id="txtSize" runat="server" text="<%Bind("Size")%>" readonly="false" enabled="false" enableviewstate="true"></asp:textbox></itemtemplate></asp:templatefield>
If I change enabled to true then on all the pages the textbox is editable. Is there a way I can call the textbox property in the user control to enable or disable the textbox? For example (this isnt working though):
public bool EnableTextBox
{
get
{
return txtSize.Enabled;
}
set
{
txtSize.Enabled=Value;
}
}
Please help!
Thanks =)
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The obvious way is to set your enabled property from a code behind property, and then set that in code.
Christian Graus
Driven to the arms of OSX by Vista.
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protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
if (e.NewPageIndex == 2){ }
else{ }
GridView1.PageIndex = e.NewPageIndex;
BindData();
}
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Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can
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Hi,
I have a gridview that is sorted alphabetically and has a header that allows the user to sort through the items by clicking on a letter. How do I set the gridview so that on the page load, only the items that start with 'A' are shown?
Thanks!
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Set your data source to only return items starting with A
Christian Graus
Driven to the arms of OSX by Vista.
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How do I do that?
I am using a user control so that one the first screen all of the items are available, but only those starting with the letter A are shown unless the user sorts the gridview. On all subsequent pages, however, only the selected items are shown, and all of those must appear.
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you don't want full alphabetisation, just to show the As on the first page and on subsequent pages to show the rest ?
You're going to have to manage paging yourself, and modify the SQL to the datasource to return the page you want.
Christian Graus
Driven to the arms of OSX by Vista.
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Perhaps I wasn't clear enough.
Page 1- Select from All available items, but default screen shows only items starting with letter A. The user can select or search for other items by clicking on a letter of the alphabet.
Page 2 - shows All of the selected items from page 1.
I need help with Page 1 and only showing the items that start with letter A.
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Page 2 is obviously unrelated to the current task. Page 1, shows only items starting with A, by default. At some point, in a way you're not defining, it goes on to show all items. Right ?
Refer to my first reply. The *best* way to only show items starting with a, is not to filter them somehow in your presentation layer, it's to only request those items from your data store. So, if you only want to show A or show all, you need two different requests for data, one which returns the 'a' items and one which returns all. You'd swap between them based on whatever state change it is that causes you to want to view all. I'd have assumed you'd be paging by letter, which would mean you'd write your own paging code ( and control, I would think ) and from there request each letter as required, but this is even easier.
Christian Graus
Driven to the arms of OSX by Vista.
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