object reference not set to instance of an object - Web Development Discussion Boards

1.) I have a gridview
2.) when the page loads, it shows rows
3.) now, i should make the backcolor of the first row = blue, the last row = red...
4.) the rows in between them should be the gradient of blue and red (blend of blue down to red)
5.) i need the code (using a dynamic method to assign colors to the rows)

i've done it already with a filter but i was asked to do it by code.
thanks so much..
hope you can help me...

I've been developing websites this year using ASPNET in my computing course. What I have found to be the best is to have one Default.aspx page and have a placeholder inside. This placeholder is then loaded on Page_Load with a web control by reading the query string after default.aspx.

what do you think of this approach? I mean, it has worked for me by providing validators on each web user control to check the session (to deny acess when a user not logged in tries to enter member areas). but my lecturer has read somewhere that web developers frown on this kind of work?

what do you think? thanks Big Grin | :-D

PS: I posted this here since I do not want actual ASPNET code... more like point of views.

In life truth does not matter. What really matters is what others believe to be the truth. (The Up and Comer - Book)

If your assignment specification(s) DO NOT forbid you from using the approach you made then that should be fine.

In any case, demand your lecturer provides you with evidence that web developers frown that kind of work, then you have the right to respond with alternate evidence.

modified 1-Aug-19 21:02pm.

I want to send some data from web form to a procedure, when a user click's on some table cells (APS Table) but asp.net table cells dont have any "OnClick event". How can i do this please?

Soroush Sarabi

hey

refert to this link to emule the onclick server side.

http://www.vbforums.com/showthread.php?t=376630

_______________
Hugues Gauthier

Dear All profestional of PHP code.
I would like you to show the way to write the code to solve above problem that as bellow :
I have 1 or other menu like
Advertisment, Sports, and......
when i click Advertisment Menu it drop down sub menus that they can consist of other sub menu and can like to other page.

sovanngold

-- modified at 1:15 Thursday 1st June, 2006

I think this is actually a client side javascript question, not PHP (since that's on the server side).

There are many dhtml/javascript menuing systems out there already, my favorite has been:
http://www.milonic.com[^] (for non-commercial use).

You might also try:
http://www.dynamicdrive.com/dynamicindex1/[^]
http://simplythebest.net/scripts/DHTML_scripts/[^]

Hi i am getting this message below are my aspx and vb codes please help me.

aspx page
--------------------
<datalist id="dlScHead">
ItemTemplate
<table>
<tr>
<td>.. ctype(DataBinder.Eval(Container.DataItem,"ScoreCardID"),string)..</td>
</tr>
</table>
datalist ID="dlScChart" DataSource=..(GetRecords(Cstr(DataBinder.Eval(Container.DataItem, "ScoreCardId")))) ..
ItemTemplate

/ItemTemplate

<table style="FONT-SIZE: 0.8em; font-face: Arial" cellPadding="5" width="100%" align="center"
border="0">
<tr>
<td colSpan="3">
<%# Server.htmlDecode(DataBinder.Eval(Container.DataItem,"Quarter1").tostring()) %>

<%# Server.htmlDecode(DataBinder.Eval(Container.DataItem,"Quarter2").tostring()) %>

<%# Server.htmlDecode(DataBinder.Eval(Container.DataItem,"Quarter3").tostring()) %>

<%# Server.htmlDecode(DataBinder.Eval(Container.DataItem,"Quarter4").tostring()) %>

</td>
</tr>
</table>
/ItemTemplate
/asp:datalist

and code behind
--------------------

in page load event i am doing

dlScHead.DataSource = GetRecords(Nothing)
dlScHead.DataBind()

and in function getRecords i am doing

Function GetRecords(ByVal scID As String) As SqlDataReader
Dim bizProgName As String = Request.QueryString("bizProgId")
Dim CommandText As String

Try
objConn = New SqlConnection(dbPath)
objConn.Open()

If scID = Nothing Then
Dim da As New SqlDataAdapter
da.SelectCommand = New SqlCommand
da.SelectCommand.Connection = objConn
da.SelectCommand.CommandText = "select scorecardId,bizProgId,scorecarddesc,businessgoal,strategy,quarter1,quarter2,quarter3,quarter4 from textData where bizProgID='" & Request.QueryString("bizProgId") & "'"
dr = da.SelectCommand.ExecuteReader(CommandBehavior.CloseConnection)
If dr.HasRows Then
'lblError.Text = ""
Else
'lblError.Text = "No records returned"
End If
GetRecords = dr

Else

cmd = New SqlCommand("select distinct measure_id from measuredata where scoreCardId = '" & scID & "'", objConn)
Dim da As SqlDataAdapter = New SqlDataAdapter(cmd)
Dim dtid As New DataTable("measureid")

da.fill(dtid)

'select all columns with id
Dim cmd1 As SqlCommand = New SqlCommand("select * from measuredata where scorecardid = '" & scID & "'", objConn)

Dim da1 As SqlDataAdapter = New SqlDataAdapter(cmd1)
Dim dt As New DataTable("measuresource")

da1.Fill(dt)

Dim datarow As DataRow

For Each datarow In dtid.Rows
Dim chart As New DataGrid
Dim myview As New DataView(dt)

' dim chart as new mycos.mycoschartweb
myview.RowFilter = String.Format("measure_id='{0}'", datarow.Item("measure_id"))

chart.DataSource = myview
chart.DataBind()
Dim i As Integer
For i = 0 To dlScChart.Items.Count - 1
dlScChart.Items(i).FindControl("placeholder1").Controls.Add(chart)
Next
Next datarow

' GetRecords = PlaceHolder1.FindControl("placeholder1")

End If

Catch ex As Exception
Response.Write("error on child-- here" + ex.ToString + "
")
Finally

End Try
End Function

i am getting error in

dlScChart.Items(i).FindControl("placeholder1").Controls.Add(chart)

please help thanks

Hi everyone

I have a very annoying problem - I use an iframe to display some content from another website, I have set the iframe height to be the same height of the inner content - but still, scrolling is available. I don't mean the scrollbars - those are disabled using the scrolling="no" property, what I mean is that the user can click and drag the mouse to scroll the iframe content, and this I want to disable. Is that possible at all?

Since the iframe height and the inner content appear to be at the same height, I'm not really sure why it happens. Maybe there is a white area beneath the content, I know that if I add 20 pixels or so to the iframe height then scrolling is disabled, but then I get an ugly white gap between this iframe content and whatever it is under it.

I would appreciate any help, please note that the solution must be from my side (the outer iframe) as I don't have access to change the inner content source code.

Thank you,

Gal

Hi guys,

I am a newbie to the world of web designing and I have been trying a few examples to familiarize myself. I am using both javascript as well as vbscript to do that.

I am trying to extract a word (lets say "table") and count them how many times they occur in the html file. After finding the word, I want to extract a pattern that follows the word and then write the result into a file.

How do I proceed? Any useful pointers will be helpful. I am not looking for actual code but any general directions so that I can learn it myself.

I'd have a look at regular expressions, they would be ideal for what you are trying to do.

You can try the SGML Reader[^] to parse the html document.

Hello all!

I'm wondering, can I use a MaskedTextBox in my ASP.NET 2.0 web form? I see it in my VS2005 toolbox when creating windows applications, but it isn't in my toolbox when creating a web form. How can I implement a MaskedTextBox in an ASP.NET 2.0 web app? for example, a phone number input textbox would already show the ( ) - in the textbox. Has anyone done this?

Thank you!

"Half this game is ninety percent mental."
- Yogi Berra

If you can read thank a teacher, if you can read in English, thank a Marine.

Hi there,
AFAIK, there's no built-in masked TextBox control in the ASP.NET 2.0, you check out the ASP.NET Custom Control Gallery[^], we used the telerik's one and happy with it.

Thank you. I suppose I will have to use a third party control, or develop my own. I suppose any option will be heavy on the javascript.

"Half this game is ninety percent mental."
- Yogi Berra

If you can read thank a teacher, if you can read in English, thank a Marine.

Just use <asp:textbox textmode="password" ....="">

Mihai Voicu Drebot

Use what Mihai..."just use"...it's sound like you have a good solution, but what? Confused | :confused:

"Half this game is ninety percent mental."
- Yogi Berra

If you can read thank a teacher, if you can read in English, thank a Marine.

seccond time today this happens to me Frown | :(

<asp:textbox textmode="Password" ....="">

this actualy adds some more functionality, like disabling copy/paste, etc
Hope i understood correctly what you need

third time? Laugh | :laugh:

Sorry still didn't get it...you are having a hard time of it!... Big Grin | :-D

"Half this game is ninety percent mental."
- Yogi Berra

If you can read thank a teacher, if you can read in English, thank a Marine.

it just doesn't like what i put there
use the asp:TextBox, with attribute TextMode="Password"

I think you misunderstood my question. Thanks anyway.

"Half this game is ninety percent mental."
- Yogi Berra

If you can read thank a teacher, if you can read in English, thank a Marine.

Hello I want to create a tab control just as given in

http://www.indianindustry.com/

Smile | :)

-- modified at 7:35 Wednesday 31st May, 2006

search the articles, a couple of people here have posted tab controls.

Hi,
I am developing a project, that feeds new record into a db, all is well so far, however i am having a problem sorting out one the errors, if a duplicate key is being input, the system error displays, i would like to know how ta catch the expeption where a duplicate key is beeing input?

Cheers

Crazzy SH!T

A better way would be to ensure that is is not possible to try and enter a duplicate key at all, as exceptions are quite processor heavy, but:

try
{
   //Insert code here
}
catch (SqlException sqlEx)
{
   //Do something with your sql exception
}
finally
{
   //Close the connection.
}