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Hello,
I am fairly new to .NET and wanted to ask recommendations on the proper use of sqlDataAdapters regarding using one sqlDataAdapter on each form created or, what is the best way to centrally setup the sqlDataAdapters that each form can access the same sqlDataAdapter. In Delphi, there is a DataModule (threaded) that allows you to put your non-visual data access components on it and then access the DataModule from each form or function that needs data access.
What might be some articles or references to a question like this?
Thank you,
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I'm not sure what exactly you want to do,but if you need the same sqlDataAdapter in each form you can pass it in constructor of your form or as ana property.
Mazy
No sig. available now.
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you could drag the data adapter from the server window on your left
I see no need for that since a data adapter isnt that expensive
I'm not an expert yet, but I play one at work. Yeah and here too.
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Is there a free algorithm in C# that I can use to detect what curly brace "{" matches what?
Thanks
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its bolded. Go into options and se it to a different color or something
I'm not an expert yet, but I play one at work. Yeah and here too.
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I made my own Perl script...
...don't have it here at work, but you can quickly
make your own...
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Hi ,
how do i perform an http post to a classic asp page from within a windows forms app?
thanks
jan
www.agilis.be
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You need to do something like this, i havent tested this, but it should work.
byte [] data = null;
WebRequest req = WebRequest.Create("http://someurl/page.asp");
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
Stream output = req.GetRequestStream();
data = System.Text.Encoding.ASCII.GetBytes ("some string to be posted");
req.ContentLength = data.Length;
output.Write (data, 0, data.Length);
output.Close();
- Kannan
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hi kannan
tx 4 the fast reply.
I have yet another question. I need to encode a checkbox value. how do i do that.
This is the form
<tr>
<td class="darkgreen"><input type="checkbox" name="doNAME"></td>
<td class="darkgreen"><strong>.name</strong></td>
<td class="darkgreen">(11.31 EUR)</td>
<td class="darkgreen"></td>
<td class="darkgreen"></td>
<td class="darkgreen"></td>
</tr>
<tr>
<td colspan="6" class="newstitle">ccTLD's</td>
</tr>
<tr>
<td class="lightgreen"><input type="checkbox" name="doBE"></td>
<td class="lightgreen"><strong>.be</strong></td>
<td class="lightgreen">(8.50 EUR)</td>
<td class="lightgreen"> </td>
<td class="lightgreen"> </td>
<td class="lightgreen"> </td>
</tr>
www.agilis.be
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Is there any way to click somewhere in the datagrid, but have it highlight the entire row like it would if you clicked the row on the far left outside all the cells?
I can get it to highlight the entire row, but it also highlights the text inside the cell i clicked on.
I guess I'm answering my own question in a way. Now I need to find out how to make the cell text not highlight. =)
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Override OnMouseDown etc.
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
//selecting row
this.Select(this.CurrentRowIndex);
//hilighting the cell
DataGrid.HitTestInfo hi=this.HitTest(e.X,e.Y);
if(e.Button==MouseButtons.Left && hi.Type==DataGrid.HitTestType.Cell && hi.Row>=0)
{
...
}
}
Hi,
AW
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Windows standard is to use Ctrl key to select multiple individual items and use Shift key to select a range of items.
Now I have winform datagrid, shift/Ctrl are working fine in the row header, but I want them to work within datagrid too. Say you can select multiple fields in the same row or same column. Can I achieve it?
Thanks for sharing your knowledge.
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Hi,
I am adding a Toolbar with images to my project. Before I run the project, the images are displayed well. But when I run the project and open the form, the images can not be displayed on the buttons in toolbar. I tried to do the same in a new project with only the Toolbar with images and it works. Could anyone give me some suggestions? Thanks.
Have a nice day.
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Katrina Gee wrote:
I am adding a Toolbar with images to my project. Before I run the project, the images are displayed well. But when I run the project and open the form, the images can not be displayed on the buttons in toolbar. I tried to do the same in a new project with only the Toolbar with images and it works. Could anyone give me some suggestions? Thanks.
Doesnt make since you have text with images and doesnt work
I add the images only and it works?
Whats your code or steps
I'm not an expert yet, but I play one at work. Yeah and here too.
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www.mysql.com lists 2 dirvers for .NET and MySQL. I was wondering if anyone has any feedback on either of these. I don't really understand the difference between these. I've copied the info and link from mysql.com below.
http://sourceforge.net/projects/mysqldrivercs/
A free simple .NET compliant MySQL driver. Made in C# but it would be used in all .NET compatible languages (VB.NET, Managed C++,...). MySQLDriverCS was written by Manuel Lucas Vinas Livschitz <ultralight32@eresmas.com>.
http://sourceforge.net/projects/mysqlnet/
ByteFX, Inc. has made available an open-source .NET data provider for MySQL. It is available under the Lesser General Public License (LGPL). The driver is implemented entirely in managed C# code and has no dependency on unmanaged, external libraries. One managed-code, external library is required (SharpZipLib) for compression of the data stream between the driver and MySQL.
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I don't use MySql at all, but I would go for mysqlnet.
You can do it on anything you choose - from .bat to .net - A customer
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i used MySqlDriverCS for few months on a windows form application. so far, it have no problem. you may try try...
i never used another one mentioned.
regards,
jim
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I am just reading thru some dot-net samples on cryptography. The samples are very good and to-the-point, man, great step forward from the old-days. There're still a few things...
QUESTION 1: A key is a byte array, okay, I have no problem with this. But is the following Key = array of sixteen HEX number? Meaning, 16x16=256bit key? Is HEX number denoted by "0x"? But shouldnt "0x10" be written as "0xA" instead?
RijndaelManaged RMCrypto = new RijndaelManaged();
byte[] Key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
//Create a CryptoStream, pass it the NetworkStream, and encrypt
//it with the Rijndael class.
CryptoStream CryptStream = new CryptoStream(NetStream,
RMCrypto.CreateEncryptor(Key, IV),
CryptoStreamMode.Write);
QUETSION 2: For RSA algo, public key is not an array of HEX as in case of RijndaelManaged algo. But how do I know how I should construct the public key? I understand you can check "LegalKeySizes". But say Legal key size is:
min 16 (bits)
max 32 (bits)
skip 8 (bits)
Then what? An int32 is 32 bits wide. Does it mean I can have ONE int32 in the byte array?
int32 someint = 12;
byte[] MyKey = {someint};
If so, the following key looks pretty long to me:
byte[] PublicKey = {214,46,220,83,160,73,40,39,201,155,19,202,3,11,191,178,56,
74,90,36,248,103,18,144,170,163,145,87,54,61,34,220,222,
207,137,149,173,14,92,120,206,222,158,28,40,24,30,16,175,
108,128,35,230,118,40,121,113,125,216,130,11,24,90,48,194,
240,105,44,76,34,57,249,228,125,80,38,9,136,29,117,207,139,
168,181,85,137,126,10,126,242,120,247,121,8,100,12,201,171,
38,226,193,180,190,117,177,87,143,242,213,11,44,180,113,93,
106,99,179,68,175,211,164,116,64,148,226,254,172,147};
byte[] Exponent = {1,0,1};
... some code ...
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Create a new instance of RSAParameters.
RSAParameters RSAKeyInfo = new RSAParameters();
//Set RSAKeyInfo to the public key values.
RSAKeyInfo.Modulus = PublicKey;
RSAKeyInfo.Exponent = Exponent;
norm
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As for question one: 0x10 in Hex == 16 in Dec, 0xA in Hex == 10.
Question 2: I wrote a little app to output all the keysizes returned from RSACryptoServiceProvider.LegalKeySizes and their max, min, and skip values. It looks like this under .NET 1.1:
Max: 16384 Min: 384 Skip: 8
And those are in bits. Divide by 8 to get bytes and you have:
Max: 2048 Min: 48 Skip: 1
So it looks like you have to have a byte[] array whose length is between 47 and 2047 (because arrays are zero based). And those values can be anywhere from 0 to 255 (the possible values for a byte).
Hawaian shirts and shorts work too in Summer.
People assume you're either a complete nut (in which case not a worthy target) or so damn good you don't need to worry about camouflage...
-Anna-Jayne Metcalfe on Paintballing
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humm... thanks.
QUESTION 1:
STEP 1: say once you have determined the legal size:
max 128
min 16
skip 16
STEP 2: Your key legal size is therefore: {16, 32, 48, 56... 128}
STEP 3: pick one size, say 56 bits
STEP 4: 56 bits = 4 x16bits = 4 HEX number = {HEX1, HEX2, HEX3, HEX4} (Is this correct?)
QUESTION 2:
Also, instead of:
byte[] MyKey = {0x10, 0x12, 0x0A, 0x3B}
Could I have generated it programmatically? Or can I load a key from a key file generated by sn.exe?
QUESTION 3:
Do I have to rely on CryptoAPI to gain access to a key in cert store - and perhaps all other tasks that has to do with cert store?
Thanks!
norm
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RSA.modulus=MyPublicKey;
What about my "Private" key?
Thanks.
norm
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bear with me, but one more question =)
<cryptoclass mysha1hash="MySHA1HashClass, MyAssembly
Culture='en', PublicKeyToken=a5d015c7d5a0b012,
Version=1.0.0.0">
Can be translated to:
byte [] mykey = {0x0A, 0x05, 0x0D...0x01, 0x02}
Is this correct?
norm
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norm wrote:
bear with me, but one more question =)
<cryptoClass MySHA1Hash="MySHA1HashClass, MyAssembly
Culture='en', PublicKeyToken=a5d015c7d5a0b012,
Version=1.0.0.0"/>
Can be translated to:
byte [] mykey = {0x0A, 0x05, 0x0D...0x01, 0x02}
Is this correct?
Ummmm....that's a really good question. The answer is that I have no clue. I'm guessing that it's actually split up like:
{0xa5, 0xd0, 0x15...} etc, because otherwise why would that zero be there? It looks like it's just a placeholder so that the 8 byte (look, it's 16 digits) key can be translated easily.
Flight to Redmond - £200
Bulldozer Rental - £100
Destroying the MS campus single handedly for not doing an Academic upgrade, PRICELESS!
-Jonny Newman
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norm wrote:
What about my "Private" key?
That's given to the constructor of the CspParameters object:
CspParameters myCspParams = new CspParameters();
myCspParams.Flags = CspProviderFlags.UseMachineKeyStore; //Or CspProviderFlags.UseDefaultKeyStore
myCspParams.KeyNumber = myKeyNumber;
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(myCspParams);
I passionately hate the idea of being with it, I think an artist has always to be out of step with his time.
-Orson Welles
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norm wrote:
STEP 1: say once you have determined the legal size:
max 128
min 16
skip 16
STEP 2: Your key legal size is therefore: {16, 32, 48, 56... 128}
No, you're mistaking the size for the possible values. The size is the length of that array. The possible values for System.Byte are still going to be 0 to 255. That just means that the legal key size has to be an array with between 16 bytes and 128 bytes in it.
norm wrote:
STEP 4: 56 bits = 4 x16bits = 4 HEX number = {HEX1, HEX2, HEX3, HEX4} (Is this correct?)
Again, no, you're mistaking the possible values in the array for the length of the array.
norm wrote:
QUESTION 2:
Also, instead of:
byte[] MyKey = {0x10, 0x12, 0x0A, 0x3B}
Could I have generated it programmatically? Or can I load a key from a key file generated by sn.exe?
Yes! In fact, that's what I always do. I usually do something like this:
string myPassword<br />
byte[] passBytes = System.Text.Encoding.Default.GetBytes(myPassword);
And then I take passBytes, trim it down to the legal size (actually, it always fits within the legal size for RSA), and then give that to the RSA CSP. As for pulling from an sn.exe generated file, sure. I don't see why not, especially since that's generated (I believe) for RSA.
norm wrote:
QUESTION 3:
Do I have to rely on CryptoAPI to gain access to a key in cert store - and perhaps all other tasks that has to do with cert store?
No. I don't believe so. At least that's not what they say http://www.gotdotnet.com/team/clr/cryptofaq.htm[^]:
10. Does the crypto library have a key management system different from CryptoAPI?
No, we internally use CryptoAPI key storage and you can reference keys stored in CryptoAPI key containers by using the CspParameters object. For a sample of how to store and retrieve your own asymmetric key pair in CryptoAPI key storage see the sample on www.gotdotnet.com/team/clr/about_security.aspx.
However, I couldn't find that sample. You may have to go hunting in the MSDN docs. Although, the most valuable thing I saw on that "Sample" page was this:
The Source Code for the .NET Framework Cryptography Classes[^] 
I passionately hate the idea of being with it, I think an artist has always to be out of step with his time.
-Orson Welles
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