ASP.NET

Re: Why the exception "Object reference not set to an instance of an object." occurs?

30-Jul-07 17:49

It means one of your casted objects returned null. You keep getting it because the code is poor - it should always check return values.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

daniel__c30-Jul-07 20:34

daniel__c

30-Jul-07 20:34

could be because if there is no user that matches the username there won't be any data at Table.Rows[0].ItemArray[0]....well that seems the most likely anyways.

WHATS THAT PROBLEMS

Neo_Shehpar30-Jul-07 14:21

Neo_Shehpar

30-Jul-07 14:21

Server Error in '/' Application.
--------------------------------------------------------------------------------

Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Cannot create/shadow copy 'Utilities, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' when that file already exists.

Source Error:

Line 121: <roleManager defaultProvider="DefaultRoleProvider" enabled="true">
Line 122: <providers>
Line 123: <add name="DefaultRoleProvider" type="EnPointe.SOOnWeb.Utilities.Security.SOWRoleProvider" />
Line 124: </providers>
Line 125: </roleManager>

Source File: C:\Projects\SalesIntranet\WebInterface\web.config Line: 123

Assembly Load Trace: The following information can be helpful to determine why the assembly 'Utilities' could not be loaded.

=== Pre-bind state information ===
LOG: User = PK-NAVAIDA\ASPNET
LOG: DisplayName = Utilities
(Partial)
LOG: Appbase = file:///C:/Projects/SalesIntranet/WebInterface/
LOG: Initial PrivatePath = C:\Projects\SalesIntranet\WebInterface\bin
Calling assembly : (Unknown).
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\Projects\SalesIntranet\WebInterface\web.config
LOG: Using host configuration file: C:\WINNT\Microsoft.NET\Framework\v2.0.50727\aspnet.config
LOG: Using machine configuration file from C:\WINNT\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/WINNT/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/9a43166b/396af647/Utilities.DLL.
LOG: Attempting download of new URL file:///C:/WINNT/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/9a43166b/396af647/Utilities/Utilities.DLL.
LOG: Attempting download of new URL file:///C:/Projects/SalesIntranet/WebInterface/bin/Utilities.DLL.
LOG: Using application configuration file: C:\Projects\SalesIntranet\WebInterface\web.config
LOG: Using host configuration file: C:\WINNT\Microsoft.NET\Framework\v2.0.50727\aspnet.config
LOG: Using machine configuration file from C:\WINNT\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
ERR: Failed to complete setup of assembly (hr = 0x800700b7). Probing terminated.

--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.832; ASP.NET Version:2.0.50727

WHAT IS THIS STUPID ERROR, PLEASE HELP ME TO GET RID OF THIS PROBLEM> Mad | :mad:

Re: WHATS THAT PROBLEMS

Christian Graus30-Jul-07 17:48

Re: WHATS THAT PROBLEMS [modified]

30-Jul-07 17:48

Don't double post.

The file is in use. Reboot.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Neo_Shehpar3-Aug-07 3:17

Neo_Shehpar

3-Aug-07 3:17

hi,
thanks for your reply but sorry to say that this is not solution to my problem. also i have critical problem for that issue, kindly if you have any solution to my problem, i shall be greatful to you all.
Neo

Setting file ContentType dynamically [modified]

ASPnoob30-Jul-07 13:09

ASPnoob

30-Jul-07 13:09

Hi, I've read that usually if one wants to display binary data from a data store one has to read it using the ExecuteScalar() method of the SqlCommand class. Then caste the object the method returns by putting it in a byte array and display it like the following.

 Response.ContentType = "application/pdf"<br />
<br />
    Response.BinaryWrite(buffer);

How do I set the Mime Type of the file retrieved from the database dynamically? What I have in mind is this, suppose I have 3 fields in my database table with their data stored like the following:

ResumeID Int        Resumes Blob         ResumeTypes   Varchar(50)
    1                Something              "application/doc"
    2                Another Something      "image/img"

I then get the value of the ResumeTypes field of my database and place it in the code like this

Response.ContentType = "Value of ResumeTypes"

How do I go about doing that? Thank you in advance for your help.

-- modified at 21:28 Monday 30th July, 2007

Re: Setting file ContentType dynamically

Christian Graus30-Jul-07 17:50

Re: Setting file ContentType dynamically [modified]

30-Jul-07 17:50

You'd do it exactly like this, store the mime type and pull it out of the DB.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

ASPnoob30-Jul-07 19:18

ASPnoob

30-Jul-07 19:18

Hi Christian, the problem is I'm unsure about how to retrieve the info from the database. I have already written code to connect to a database and retrieve data but its for a different purpose. The following is the modified code to try to make the program dynamically set the mime type.

For i = 0 To ListBox1.Items.Count - 1
         If ListBox1.Items(i).Selected Then

             DBCommand = New OdbcCommand("SELECT DocID, Document, DocTypes From ArchiveTB where Authors = '" & ListBox1.Items(i).Text & "'", DBConn)

         End If
     Next
     If Not IsNothing(DBConn) Then
         DBConn.Open()
         DBCommand.Connection = DBConn
         Dim DS As New DataSet
         Dim AD As New OdbcDataAdapter(DBCommand)

         AD.Fill(DS, "ArchiveTB")
         AD.Dispose()
         Me.ListBox2.DataSource = DS
         Me.ListBox2.DataTextField = "DocType"
         Me.ListBox2.DataValueField = "DocID"
         ListBox2.DataBind()

         Dim buffer As Byte() = New Byte(contentLength - 1) {}

         reader.GetBytes(0, 0, buffer, 0, contentLength)

         Response.ContentType = "" & ListBox2.SelectedItem.Text & ""

         Response.BinaryWrite(buffer)

     End If

Please take a look and see if I can do it this way. However, I don't want to force the user to choose the the mime type, how can I do this without using a list box? Thanks again for your help.

-- modified at 3:20 Tuesday 31st July, 2007

Re: Setting file ContentType dynamically

Christian Graus30-Jul-07 19:27

ASP.NET Button postback issue [modified]

30-Jul-07 19:27

To reiterate advice I've given you many times before

1 - use real variable names, not listbox1
2 - don't grab text from a control to create SQL, it can be used for injection attacks
3 - don't iterate over a collection looking for the item that is selected, when the listbox has a selecteditem property

I despair that we are discussing the same function, week after week, but you don't actually take the advice given to you.

ASPnoob wrote:
Response.ContentType = "" & CurrentModels.SelectedItem.Text & ""

Why are you grabbing the mime type from the CurrentModels control, and where does the buffer variable come from ? What does this have to do wtih ListBox2, anything ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

update panel problem

Mogaambo30-Jul-07 12:07

Mogaambo

30-Jul-07 12:07

I am facing one typical problem, that is I have to just create update panels dynamically have server side controls in their content template, which is done through clicking the button which is in another
update panel whose update mode is set to conditional, this is bcoz when the user click to add controls and fill them with values and then again click to generate more controls , the previously generated controls loses its values, so i put the button that generate controls dynamically in another update panel and set its update mode to conditional, now when i click on to add controls nothin happens , but when i took button to outside panel it adds but page postback , i want to add controls using partial postback and when i click add button it will not cause the previously dynamically generated controls to lost their values.

stoland - work30-Jul-07 9:57

stoland - work

30-Jul-07 9:57

Hello All

I have a custom web control i am finishing, and have run into an issue that has caused problems for me in the past.

That problem being that when said button is clicked, the page state (ViewState) is only changed after the second click.

These are programmatically created buttons.

This appears to be some weird postback issue, but I am about out of ideas here.

Last time I ran into this, I simply forced a full-page reload, and that was enough. As this is part of a control, that hack is not an option.

Can someone please enlighten me as to how a control as "simple" as a button can "just" do what it is supposed to on the FIRST click?

--stoland

-- modified at 17:28 Monday 30th July, 2007

Re: ASP.NET Button postback issue

Christian Graus30-Jul-07 11:13

30-Jul-07 11:13

Usually this means that your code is setting the viewstate at the wrong point in the page lifecycle. The order is page_load, events, page_prerender. Set some breakpoints and walk through your code to see the sequence of events, and you'll work out where your bug is. The button, I guarentee you, is working fine.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Table Question

nlindley730-Jul-07 8:54

30-Jul-07 8:54

I was wondering if its possible to set the visibility element of an HTML table, using the aspx.vb file. I know you cant set the ID and call it like that. Just wondering if there is any good way to do this (preferably without JS). What i'm doing is setting certain tables to be visible based on who logs in.

Thanks,
Nate Lindley

rashadaliarshad30-Jul-07 9:05

rashadaliarshad

30-Jul-07 9:05

yes, it is easy to achieve but what you have to do is to built the table (add rows and colums) dynamically at runtime in the table...

e.g in code-behind file (default.vb) use

if condition=true then
//add code to create table with 3 rows and 5 colums
elseif condition2 =true then
// add code to create table with 2 rows and 2 colums
elseif condition3 = true then

and so on......hope it helps

Note: at Design time you should just place the Table control on the place where it needs to drawn at runtime... then handle, height, width, and etc attributes programtically in code behind file

:- Rashid Ali -:

nlindley730-Jul-07 9:21

30-Jul-07 9:21

Hey Rashad,

Yea I could do that to create a data table, but I just want an HTML table. Basically the situation is that I'm going to have a page with 5 tables on it (one on top of the other). Each table has multiple rows (one for each PDF for that state), and I want to set the Visibility attribute (style) of each one.

Thanks,
Nate

rashadaliarshad30-Jul-07 9:30

rashadaliarshad

30-Jul-07 9:30

i think u can achieve the same task using Server Table Control, why you want to use html table only?

:- Rashid Ali -:

nlindley730-Jul-07 9:41

30-Jul-07 9:41

Thanks for the quick responses rashad! Basically these tables are just one column tables with multiple rows that contain links to PDF files. I know I could just use one table and set the links for that table, but I'd rather have 5 separate tables and have their Visibility properties changed based on the login.

Thanks,
Nate

ToddHileHoffer30-Jul-07 9:06

ToddHileHoffer

30-Jul-07 9:06

Of course.

objHTMLTbl.Visible = false

I didn't get any requirements for the signature

nlindley730-Jul-07 9:19