Re: Encoding - C# Discussion Boards

eggie521-Jun-04 12:39

21-Jun-04 12:39

Now, I don't now anything about encoding... Now lets take this text for example. It's "regular" encoding, correct? Now take this @ for example. Is the @ sign something special?

/\ |_ E X E GG

Re: Encoding

Christian Graus21-Jun-04 14:29

Christian Graus

21-Jun-04 14:29

yeah, it's big and bold. Perhaps you need to reword your question ?

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: Encoding

eggie521-Jun-04 18:21

eggie5

21-Jun-04 18:21

I don't understand... Confused | :confused:

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Re: Encoding

Christian Graus21-Jun-04 18:23

Christian Graus

21-Jun-04 18:23

The @ is 'special' in that it's been made larger and bold. Your question was somewhat enigmatic. That's why I suggested you reword it.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: Encoding

eggie522-Jun-04 8:54

eggie5

22-Jun-04 8:54

ok, thank you.

/\ |_ E X E GG

Re: Encoding

Steven Campbell21-Jun-04 15:39

Steven Campbell

21-Jun-04 15:39

Encoding refers to the way that bits are translated to characters. What you refer to as "regular encoding" is ASCII, which is a 7 bit encoding allowing a total of only 128 characters. Unicode encodings (UTF7, UTF8, UTF16) are more flexible, and can represent far more characters. The numbers in the UTF codes refer to the minimum number of bits that are used to represent a single character.

Re: Encoding

Heath Stewart22-Jun-04 2:48

Heath Stewart

22-Jun-04 2:48

Encoding is important when working with file streams. For a good article on encoding, read The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)[^].

The '@' character is a literal character (no escapes necessary), and as with everything else, you can read more about it in the C# language documentation. Read the documentation[^] on the string type for more information about @-quoted strings.

For example, "Hello, \"world\"" == @"Hello, ""world""", and

"Hello,\nworld!" == @"Hello,
world!"

(line break intentional)

Microsoft MVP, Visual C#
My Articles

Re: Encoding

eggie514-Sep-04 5:49

eggie5

14-Sep-04 5:49

�

So, is that character above (U+FFFD) not showing because it is unicode, and this webpage is ASCII?

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DataSet - saving rows that are calculated

myNameIsRon21-Jun-04 11:24

myNameIsRon

21-Jun-04 11:24

Hi,
I have a column that is calculated (from other columns in the DataSet):
myDataTable.Columns.Add("ItemSubTotal", typeof(decimal), "ItemPrice * ItemQuantity");

When I try and save the DataSet to file with this Parameter:
myDataAdapter.InsertCommand.Parameters.Add("@ItemSubTotal", OleDbType.Decimal, 100, "ItemSubTotal");

I get this error:
The column mapping from SourceColumn 'ItemSubTotal' failed because the DataColumn 'ItemSubTotal' is a computed column.

Is there a way to save a computed column?

Thanks,
Ron

Re: DataSet - saving rows that are calculated

Dave Kreskowiak21-Jun-04 11:42

Dave Kreskowiak

21-Jun-04 11:42

No, because it's a Computed Column. There's nothing to save. When you query against that column, you'll get the result of the column. Why would you want to save it again? If you want to save the value, you'll have to save it into another column in your existing table, or a different one if you want.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: DataSet - saving rows that are calculated

myNameIsRon22-Jun-04 13:54

myNameIsRon

22-Jun-04 13:54

Thanks Dave,
Ron

Re: DataSet - saving rows that are calculated

myNameIsRon22-Jun-04 17:41

myNameIsRon

22-Jun-04 17:41

Hi again Dave,
Sorry new to programming...

I'm having difficulty finding the code to save the computed column values to the other column (2nd column not viewed as expression). Can you show me an example?

Thanks,
Ron

DirectoryServices ADSI Provider Support

Anonymous21-Jun-04 11:13

Anonymous

21-Jun-04 11:13

Hi everyone.

I am working on an application which will rely heavily upon the DirectoryServices namespace. Specifically, I will be using the ADSI provider to manipulate and configure IIS.

Lately I've become a little concerned with Windows version compatibility. The application will be used extensively on Windows 2000 Server, along with several Windows 2003 Server boxes. The problem is that on a number of MSDN pages, I see notes that indicate various features of the DirectoryServices ADSI provider require Windows 2003 Server.

However, my limited tests appear to indicate otherwise. So far, I've not had a problem with any of my Windows 2000 Server boxes.

Here is one such example -- http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iissdk/iis/adding_metabase_properties_to_a_collection_using_system_directoryservices.asp

The above page notes that the Virtual Directory sample requires Windows 2003 Server, however the sample compiles (after fixing the obvious source code errors) and runs without issue on at three Windows 2000 Server boxes I've tested.

So what is the issue here? Anyone run into this? Can I count on this work on Windows 2000 Server? Where can I find the definitive answer on this?

Thanks!

Re: DirectoryServices ADSI Provider Support

Dave Kreskowiak21-Jun-04 11:40

Dave Kreskowiak

21-Jun-04 11:40

I haven't run into this, but if you want to make sure your app is going to work on all of your platforms, Test, Test, Test, Test, and Test some more, until YOU'RE happy with the functionality. Then hand it to a couple of beta testers and see if THEY'RE happy with the product on the platforms your suspicious of.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Newline in constant error

vcorn21-Jun-04 8:05

vcorn

21-Jun-04 8:05

hi, anyone know about that kind of error?
Thanks

Re: Newline in constant error

Dave Kreskowiak21-Jun-04 8:17

Dave Kreskowiak

21-Jun-04 8:17

It would help if you posted the code where the error occurs!

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Newline in constant error

vcorn21-Jun-04 8:53

vcorn

21-Jun-04 8:53

Thanks David,
i close the Visual Studio and reopen,
everything's just fine then,
sounds weird though..
Thanks

But i have another question, i wanna apply column style to one of the columns in my table, i wanna hide one column but setting its width to zero, i have five datacolumn object, but i only have one gridcolumnstyle with mapping name set to one of the column name i wanna hide.
but the style doesn't apply, the column is not hidden.
how am i goin to hide it?

Re: Newline in constant error

Dave Kreskowiak21-Jun-04 9:04

Dave Kreskowiak

21-Jun-04 9:04

You hide the column by setting it's width to 0, but since you haven't supplied any code, I can't tell you what your doing wrong. So, here's an example:

private void HideColumnOfDataSet()
{
    System.Data.DataTable points = new System.Data.DataTable("Points");
    points.Columns.Add(new DataColumn("X", typeof(int)));
    points.Columns.Add(new DataColumn("Y", typeof(int)));
    points.Rows.Add(new object[]{1, 2});
    points.Rows.Add(new object[]{3, 5});
    dataGrid1.DataSource = points;
 
    DataGridTableStyle tableStyle = new DataGridTableStyle();
    tableStyle.MappingName = "Points";
    dataGrid1.TableStyles.Add(tableStyle);
    dataGrid1.TableStyles["Points"].GridColumnStyles["X"].Width = 0;
}

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Newline in constant error

vcorn21-Jun-04 9:19

vcorn

21-Jun-04 9:19

i get null reference exception in this line
this.dataGrid1.TableStyles["Students"].GridColumnStyles["Password"].Width = 0;
how?

Re: Newline in constant error

Dave Kreskowiak21-Jun-04 9:27

Dave Kreskowiak

21-Jun-04 9:27

I can't tell without seeing the rest of your code in that block. Most likely, you're missing a 'new' somewhere.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Newline in constant error

vcorn21-Jun-04 9:31

vcorn

21-Jun-04 9:31

Thanks Dave,
found it,
i did it inside the initialize component(using designer)
and indeed the designer define the table style before adding column.
i replace the order, add column first, then it's fine.
Thanks Smile | :)

Re: Newline in constant error

Heath Stewart21-Jun-04 9:54

Heath Stewart

21-Jun-04 9:54

Accessing indexes requires that an object at that index (or with that index keyword, like the table style or column style name above) exists. If it doesn't, null is returned from the index property. When you try to call a method or access a property on null, you get a NullReferenceException.

Microsoft MVP, Visual C#
My Articles

Re: Newline in constant error

the last free name21-Jun-04 21:37

the last free name

21-Jun-04 21:37

I sometimes see it in a perfectly valid line of code. I simply cut and re-paste the line and the compiler is then happy!

enumerating groups a user belongs to using WinNT://

inyoursadachine21-Jun-04 6:58

inyoursadachine

21-Jun-04 6:58

Hi,
How does one enumerate the groups a user belongs to using the WinNT:// provider (not LDAP) ??

TIA,
Matt

Re: enumerating groups a user belongs to using WinNT://

Dave Kreskowiak21-Jun-04 8:12

Dave Kreskowiak

21-Jun-04 8:12

Well, in VBScript, it looks something like this:

strComputer = "."   ' Use a '.' to denote the local machine.
Set colGroups = GetObject("WinNT://" & strComputer & "")
colGroups.Filter = Array("group")
For Each objGroup In colGroups
    For Each objUser in objGroup.Members
        If objUser.name = "username" Then
            Wscript.Echo objGroup.Name
        End If
    Next
Next

You go through each group on the machine and check to see if the username exists in that group.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

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