Comments by BrianHamilton (Top 26 by date)

That's a lot of questions and seems like a strange way to develop your application. Why not write some code and post it. You could take a different approach to the web service.

Would need to see your code but you could use a regular expression, String.split or a variation of substr and indexOf()

Your statement makes no sense - if everyone learned the language (learning the language as you put it) - there would be no need for this site. No-one is required to reply to any question and I do not believe I have broken any site rules.

Works perfectly, thanks a million. Brian.

void ProcessStudent(Student stu[], int Cnt) as opposed to void ProcessStudent(Student * stu[], int Cnt)but other than that, works fine. Thanks!

Yes that works perfectly - I had been under the impression passing a form to a method was to be avoided, but I assume this is better than making form elements public?

will repost.

Got it working - Thans

I get what you are saying but if I put the above in my class, it will not recognise the textboxes, is it supposed to go in the form?

The error is: An unhandled exception of type 'System.StackOverflowException' occurred in ManageStudentsWin.exe. The line it occurs on is

Form1 details = new Form1();

How do I pass an instance of the form to the class? I had looked on the web but didn't see anything about that.

Yes, and I think it was yourself that provided a fully working version (as shown below) - I assume the MD5 on wiki is the exception as all other files work fine with the other program - I just found the solution below a little hard to understand - I've usually done encrypting/decrypting with no problems whether it be string or files, but I get that wikipedia were showing a representation of a binary file that probably exists somewhere..

<pre>
static void Main(string[] args)
{
byte[] myBytes1 = ReadHexFile("FileA.txt");
byte[] myBytes2 = ReadHexFile("FileB.txt");

using (MD5 md5Hash = MD5.Create())
{
string hash1 = GetMd5Hash(md5Hash, myBytes1);
string hash2 = GetMd5Hash(md5Hash, myBytes2);
Console.WriteLine("The MD5 hash of " + string.Join("", myBytes1.Select(b => b.ToString("x2"))) + " is: " + hash1 + ".");
Console.WriteLine("The MD5 hash of " + string.Join("", myBytes1.Select(b => b.ToString("x2"))) + " is: " + hash2 + ".");
}
Console.ReadLine();
}

static string GetMd5Hash(MD5 md5Hash, byte[] input)
{
byte[] data = md5Hash.ComputeHash(input);
return string.Join("", data.Select(b => b.ToString("x2")));
}

static byte[] ReadHexFile(string path)
{
System.IO.FileStream fs1 = System.IO.File.OpenRead(path);
System.IO.StreamReader sr1 = new System.IO.StreamReader(fs1);

string hexString = sr1.ReadToEnd();
hexString = System.Text.RegularExpressions.Regex.Replace(hexString, @"\W", "", System.Text.RegularExpressions.RegexOptions.Singleline);
int ix = 0;

byte[] myBytes1 = new byte[hexString.Length / 2];
while (ix < hexString.Length)
{
string hexByte = hexString.Substring(ix, 2);
myBytes1[ix / 2] = byte.Parse(hexByte, System.Globalization.NumberStyles.HexNumber);
ix += 2;
}

return myBytes1;
}
</pre>

Isn't that more concurrent programming? Parallel programming concerns operations that are overlapped for the specific goal of improving throughput.

Apologies, of course - It's working now. Thanks for the link and explanation.

I see what you mean, but the async GUI code functions perfectly.

Have altered above code as follows:

[STAThreadAttribute]
public void syncRead()
{
//OpenFileDialog ofd = new OpenFileDialog();
//ofd.ShowDialog();
openFileDialog.ShowDialog();
FileStream fs;

When I run program and click the ReadSync button, the file open dialog box does not show up - it didn't before either.

Works perfectly...Thanks

Above solution works fine - just used binary files to get the hash collisions working.

This code works as well when I convert the byte array into a string, but I'm still getting different hash values for the files.

The program works in terms of getting hash values, but they are not identical, which they are in the C program. I have altered the wiki inputs in my text files as an exact copy of the ones below and now program crashes:
http://en.wikipedia.org/wiki/MD5

FileA:
d131dd02c5e6eec4 693d9a0698aff95c 2fcab58712467eab 4004583eb8fb7f89
55ad340609f4b302 83e488832571415a 085125e8f7cdc99f d91dbdf280373c5b
d8823e3156348f5b ae6dacd436c919c6 dd53e2b487da03fd 02396306d248cda0
e99f33420f577ee8 ce54b67080a80d1e c69821bcb6a88393 96f9652b6ff72a70

FileB:
d131dd02c5e6eec4 693d9a0698aff95c 2fcab50712467eab 4004583eb8fb7f89
55ad340609f4b302 83e4888325f1415a 085125e8f7cdc99f d91dbd7280373c5b
d8823e3156348f5b ae6dacd436c919c6 dd53e23487da03fd 02396306d248cda0
e99f33420f577ee8 ce54b67080280d1e c69821bcb6a88393 96f965ab6ff72a70

Well, the code below is the umpteenth version:
static void Main(string[] args)
{
System.IO.StreamReader myFile1 = new System.IO.StreamReader("FileA.txt");
System.IO.StreamReader myFile2 = new System.IO.StreamReader("FileB.txt");

string myString1 = myFile1.ReadToEnd();
string myString2 = myFile2.ReadToEnd();


using (MD5 md5Hash = MD5.Create())
{
string hash1 = GetMd5Hash(md5Hash, myString1);
string hash2 = GetMd5Hash(md5Hash, myString2);

Console.WriteLine("The MD5 hash of " + myString1 + " is: " + hash1 + ".");
Console.WriteLine("The MD5 hash of " + myString2 + " is: " + hash2 + ".");

}



}
static string GetMd5Hash(MD5 md5Hash, string input)
{
byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));
StringBuilder sBuilder = new StringBuilder();

for (int i = 0; i < data.Length; i++)
{
sBuilder.Append(data[i].ToString("x2"));
}
return data.ToString();
}