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Hello!
Here is my function which opens a XML document and retrieves the value of it. But I am getting an error message because of a null value. It doesn't read the DateInstalled value from the file. What is the error? Thanks.
Private Function GetConfigParameter(ByVal MyKey As String) As String
Dim XmlDocument As New XmlDocument
Dim XmlNode As XmlNode = Nothing
XmlDocument.Load(Environment.CurrentDirectory & "\app.con")
XmlNode = XmlDocument.DocumentElement.SelectSingleNode("//configuration/AppDefaultValues/add[@key=""" & MyKey & """]")
GetConfigParameter = XmlNode.Attributes.GetNamedItem("value").Value
XmlDocument = Nothing
End Function
-- modified at 12:02 Monday 19th March, 2007
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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Are you talking about AppSettings ?
here is a link[^]
"A good programmer is someone who looks both ways before crossing a one-way street." -- Doug Linder
coolestCoder
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No! actually it is an simple xml file residing under current directory. Somehow it is not opening file and getting the values. I haven't figured out yet what is causing the problem.
Thanks.
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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Is it as simple as the Environment.CurrentDirectory function is not returning what you expect, so the file is not found? I ran your code with an xml file named "app.con" in the same folder as the VS Project, only to have to copy it to the VSProject\bin\Debug folder before the app would find it.
Also, since you don't check any results of your XMLNode fetch, maybe the element or its attributes are not named as you would expect (keeping in mind that XML is case sensitive, though VB isn't)? If your XMLNode object is Nothing, then it doesn't have an Attributes property on which you can call a GetNamedItem method.
My sample "app.con" file has this in it
<root>
<configuration>
<appdefaultvalues>
<add key="huh" value="what">
I pass "huh" to the funtion, and it returns "what". If I pass "Huh", it errors because the XMLNode object is null (Nothing).
Hope this helps.
To err is human. To really foul things up requires a computer.
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Let's try this without masking the xml because it looks like html 
app.con =
<?xml version="1.0" encoding="utf-8" ?>
<root>
<configuration>
<AppDefaultValues>
<add key="huh" value="what" />
</AppDefaultValues>
</configuration>
</root>
To err is human. To really foul things up requires a computer.
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Hi All,
Does anybody know how to manipulate with the temporary internet files in .net
I found that there is a file called index.dat. I think this file describes the IE.content in the temporary internet files folder. Is there a way to retrieve the urls from the index.dat (or any other source)?
thanks a lot
Haleem
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DataGridView controler ,
how to change row backcolor at run time?????????????????????
Thiwa
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If you are talking about a GridView in a web project:
Access the RowDataBound event of the grid and
If the e.Row.RowType = DataControlRowType.DataRow Then <br />
e.Row.BackColor = Color.Red<br />
End If
If you talking about a DataGridView in a windows forms project:
If you want to change row colors specifically to alternate row colors, that feature is already built in. Just put something like this in your form load event:
Dim styleDefault As New DataGridViewCellStyle()<br />
styleDefault.BackColor = Color.White<br />
styleDefault.ForeColor = Color.Black<br />
styleDefault.SelectionBackColor = Color.White<br />
styleDefault.SelectionForeColor = Color.Black<br />
dgvMyGrid.DefaultCellStyle = styleDefault<br />
<br />
Dim styleAlternate As New DataGridViewCellStyle()<br />
styleAlternate.BackColor = Color.LightGoldenrodYellow<br />
styleAlternate.ForeColor = Color.Black<br />
styleAlternate.SelectionBackColor = Color.LightGoldenrodYellow<br />
styleAlternate.SelectionForeColor = Color.Black<br />
dgvMyGrid.AlternatingRowsDefaultCellStyle = styleAlternate
If you want to access a specific row and highlight it, just access the style directly: (intMyRowIndex is the row index of the cell you wish to highlight)
Dim styleTemp As New DataGridViewCellStyle<br />
styleTemp.BackColor = Color.Red<br />
styleTemp.ForeColor = Color.Black<br />
styleTemp.SelectionBackColor = Color.Red<br />
styleTemp.SelectionForeColor = Color.Black<br />
<br />
dgvMyGrid.Rows(intMyRowIndex).DefaultCellStyle = styleTemp
Hope this helps.
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TAHNKS.......
I want to change color to specific row.
but my problem is deferent, Im open the Form using another button.
First time I run the program it works, but Im closed the from and open it again it not working????????????????
Why it happened?????????
Thiwa
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Hi,
I want some instructions in converting existing C# Windows Application to C# Web Application..
Please post your replies as soon as possible.
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If the application has been properly architected it should just be a matter of rewriting the presentation (UI) layer - perhaps with the odd addition elsewhere to support a stateless model of working. If it hasn't been well architected then you are looking at rewriting the whole application.
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Spamming different 10 forums with the same question is very rude and totally unnecessary.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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I need to send reports to user in excel sheet format. so plz tell me the way how to convert my data into the excel file format,retrieved from database.
With Thanks & Regards
Amit Sk Sharma
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Hello,
My project is about to check the some values in a word document and to open a new word document and type those values and to insert the BUTTON to close that document.
i finished inserting the Button and i dont know how to use that button to close,
I used this code to insert the command button
Selection.InlineShapes.AddOLEControl ClassType:="Forms.CommandButton.1"
Help me to proceed further....
Thanks,
Nanda
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Hello!
I am going to finalize my application what I created with vb.net. However I have faced with an intrique problem about creating and integrating an activation code method. I don't use any database but a XML file to store
DateInstalled and ActivationStatus values in this file as encrypted data because I am not able to overwrite a resource field in my resource file in runtime. Even I use encrypted data in XML file this file can be edited by a user.
Lets assume that one user had installed the app on 3/20/2007 and second user had installed the app. on 3/29/2007. If first user has destroyed the data in XML file, the second user can pass his own XML file to first user with a most recent application installation date. How could you solve such problem? What would be your best approach as method to solve activation integration for your application? Where would you safely store such imported information?
Any advice is appreciated.
Thank You! 
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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Because your app is .NET, any code you write to protect it can be decompiled and removed. The big question is, why do you think you need to take it this far ? How many people are going to try to steal your app ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"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 )
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I am not concerned if anyone steals my application. All I was doing is to force my brain to come up with a suitable solution. I know there is no way to protect the app with hundred percent but at least I make things more complex for 3rd parties. I better keep working on it. 
Thanks Christian.
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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Hi,
Like you said, you can only make it more difficult, never impossible. Perhaps the simplest way to accomplish what you want, is building in more layers.
For example, you could add another xml file, with a nondescript name, and record the last access dates of all other files in the installation folder, upon installation.
At the moment your app checks for the date, you can cross reference it to the last access date of the xml file. If the combination isn't good, you know the user edited the xml file or copied the xml file from another installation. (On the other hand, using an xml file instead of say the registry, allows the user to simply uninstall the entire app and install it again. In any scenario, the xml files would all be recreated.)
You could also revert to confusion: name the tags you use for some other inconspicuous
object or setting that you are "checking".
Alternatively, or in combination, you could take the date you are recording now, take some other variable which value should be unique to this particular installation, or better even, the user's PC, and use them in some sort of formula, to create a code. Register the code somewhere else, and use it to retrieve the original installation date, and PC.
If you hadn't already thought of these yourself...
Good luck,
Johan
My advice is free, and you may get what you paid for.
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I have the follow code in VB.NET 2005, i am trying to make it into a loop, is it possible, and if so, anyone fancy having a go at helping me at doing it, hints...etc?
The numbers of labels and text boxes goes from 1-10, so it will have to loop, then add 1 to the integer value, something like that!!! HELP!
CODE:
---
Priv Sub txtInput1_TextChanged(…) Handles txtInput1.TextChanged
If txtInput1.Text.ToLower = lblLetter1.Text Then
lblLetter1.ForeColor = R : intScoreAll += 1
Else
lblLetter1.ForeColor = W
End If
lblLetter1.BorderStyle = BorderStyle.None : txtInput1.Enabled = False
txtInput2.Enabled = True
lblLetter2.BorderStyle = BorderStyle.FixedSingle
txtInput2.Focus()
End Sub
---
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You can use a foreach loop on the Controls collection and look for items by name or tag, or use dynamic type checking to work out which items are textboxes.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"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 )
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I have a text file with the AE character in it when I try to read it with File.ReadAllText it does not read the character (it just removes it). I have tried File.ReadAllBytes(PATH/FILENAME.txt).replace(chr(198),"AE") and a couple other Replace ideas and so far nothing has worked. The only method I have found that works is:
Bytes = File.ReadAllBytes("PATH/FILENAME.txt")
For i = 0 To Bytes.Length - 1
TextFile += Chr(Bytes(i))
Next
This is horribly inefficient but does work...
Any better ideas?
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Use the overload of the ReadAllText method that takes an encoding to specify the encoding that was used to create the file. Example:
text = File.ReadAllText(path, Encoding.UTF8)
---
single minded; short sighted; long gone;
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hello evryone!!
m workin on fingerprint matchin algos nd hav selected the minutiae based approach.
the image enhancement,thinning nd stuff is done however m stuck on the pattern matching thing.
my code works on the pixel co-ordinates and pixel orientation approach, wherein i am confused as to how do i match the pixel cordinates as there is always a displacement problem in the input and the template image , evenif they have the same orientation
i am workin on vb.net 2003
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You can't compare absolute coordinates, as the images you are comparing may be offset, scaled and rotated against each other. Express the relations between the coordinates as vectors, so that you can easily scale and rotate them when comparing them.
---
single minded; short sighted; long gone;
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