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is there a way to do this in c#, i knew a way in c++, but all my searches have come to nothing, basically i am string the type of the class i am using in an xml file and trying to setup the exact type of class from the information stored in the xml file.
There has to be a way to do this as the xmlserialiser is able to do it/
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Well, if I understood correctly what you need, the xml serializer is able to create a class from an xml document, but you need to know the class type.
If you have the class type name in a string, you can use Type.GetType to get the corresponding type object.
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yeah i know that i am makin my own custom class serialiser, and am already referencing the GetType method from the class, what i weant to do is when i read the xml file and get the class type is to initialise the class from the class type (confusing i know)
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The easiest way should to load the file using XmlDocument and get the type value from the corresponding node.
Then load the type and use it to initialize the serializer.
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i still don't think you understand what i mean, oh well my fault, i found a way to to do it eventually, if you use Activator you can initialise an object of any class type by passing in the Type into the CreateInstance method like this:
Activator.CreateInstance(Type type)
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Oh, now I've understood, you didn't wanted to use XML serialization, but to replicate it.
Sorry if I wasn't more useful, I'm glad you found a solution anyway.
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i am new on C# and i need some help about arraylist argument out of exception problem please help me 
and these are my codes ;
in Form1.cs;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
buton bt = new buton();
bt.kayit(@"C:\Users\Casper\Desktop\a.txt", textBox1.Text);
}
public void button2_Click(object sender, EventArgs e)
{
buton bt = new buton();
textBox2.Text = bt.okuyucu(@"C:\Users\Casper\Desktop\a.txt");
}
private void button3_Click(object sender, EventArgs e)
{
buton bt = new buton();
bt.silgi(@"C:\Users\Casper\Desktop\a.txt", Convert.ToInt16(textBox3.Text));
}
}
}
in buton.cs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace WindowsFormsApplication3
{
class buton
{
int counter = -1;
List<string> silici = new List<string>();
public string okuyucu(string path)
{
string a = string.Empty;
StreamReader okuyucu = new StreamReader(path);
a = okuyucu.ReadToEnd();
okuyucu.Close();
return a;
}
public void kayit(string path, string text)
{
counter++;
string okur = string.Empty;
StreamReader okuyucu = new StreamReader(path);
okur = okuyucu.ReadToEnd();
okuyucu.Close();
StreamWriter yazıcı = new StreamWriter(path);
silici.Add(text);
yazıcı.WriteLine(okur + text);
yazıcı.Close();
Console.WriteLine(silici.Count);
}
public void silgi(string path, int silineceksirasi)
{
Console.WriteLine(silici.Count);
silici.RemoveAt(silineceksirasi); ----> I GET MİSTAKE WHEN ı CLİCK BUTTON3!!!
StreamWriter deleter = new StreamWriter(path);
deleter.Dispose();
deleter.Close();
for (int k = 0; k <= silici.Count - 1; k++)
{
string okur = string.Empty;
StreamReader okuyucu = new StreamReader(path);
okur = okuyucu.ReadToEnd();
okuyucu.Close();
StreamWriter yazıcı = new StreamWriter(path);
yazıcı.WriteLine(okur + silici[k]);
yazıcı.Close();
}
}
}
}
THANKS FOR YOUR HELPS 
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Hi,
Please keep in mind for the next post.....
Enclose the code within the code and pre tags, this makes it much easier to read.
Example:
public void kayit(string path, string text)
{
counter++;
string okur = string.Empty;
StreamReader okuyucu = new StreamReader(path);
okur = okuyucu.ReadToEnd();
okuyucu.Close();
StreamWriter yazıcı = new StreamWriter(path);
silici.Add(text);
yazıcı.WriteLine(okur + text);
yazıcı.Close();
Console.WriteLine(silici.Count);
}
Many thanks
Kind regards,
The only programmers that are better C# programmers, are those who look like this -> ![Green Alien | [Alien]](https://codeproject.freetls.fastly.net/script/Forums/Images/alien.gif) |
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif) Programm3r
My Blog: ^_^
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Programm3r wrote: code and pre tags
just PRE tags will do, it does not make sense to nest CODE and PRE tags; it may have had some use long ago, it does not today.
Luc Pattyn
Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.
Local announcement (Antwerp region): Lange Wapper? Neen!
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My guess is that you have a number in textBox3 that is less than zero or equal to or greater than the .Count of your "silici" List. If you try to remove something at an index that doesn't exist the ArgumentOutOfRangeException is thrown. What is the value of "silineceksirasi" when you reach the silici.RemoveAt(silineceksirasi); statement? Make sure it's not equal or greater than the List.Count. Good luck! 
PS. Please use pre tags when posting code.
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bounik wrote: silici.RemoveAt(silineceksirasi); ----> I GET MİSTAKE WHEN ı CLİCK BUTTON3!!!
Lets look closer at the List<(Of <(T>)>).RemoveAt Method method:
public void RemoveAt(
int index
)
Exception Condition
ArgumentOutOfRangeException index is less than 0.
-or-
index is equal to or greater than Count.
ArgumentOutOfRangeException is thrown when a method is invoked and at least one of the arguments passed to the method is not
nullNothingnullptra null reference (Nothing in Visual Basic) and does not contain a valid value.
Kind regards,
The only programmers that are better C# programmers, are those who look like this -> ![Green Alien | [Alien]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/alien.gif) |
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif) Programm3r
My Blog: ^_^
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i am sorry becz. i am new on C#  and i do not understand your statements can you tell it more clearly?
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thanks for your attention
but i checked that the count of
bounik wrote: Console.WriteLine(silici.Count);
silici.RemoveAt(silineceksirasi); ----> I GET MİSTAKE WHEN ı CLİCK BUTTON3!!!
StreamWriter deleter = new StreamWriter(path);
deleter.Dispose();
deleter.Close();
"silineceksirasi" is not greater or a minus value.
if i should tell something clearly
the codes adds items to array my problem is when i wanna delete sthg from this list, the array does not keep the items
in its background as a result the listcount seems "0" this is the my problem
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But if I read your code correctly (and I'm sorry, but it's a bit hard when you don't use the pre tags and have chosen names that doesn't make any sense if you don't speak turkish(?)) this is what happens when you click button3:
1. You create a new bt object.
2. You call the silgi method on that object.
At this point your bt object's member silici does not contain any items. It's just an empty List and when you try to remove an item from that empty list you get the exception thrown.
I think you need to do some reading when it comes to objects and the creation of new objects. Are you sure you want to create 3 different buton objects, or is your intention to create one bt object and add things to its "silici" List?
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i am really pleased for your help and thanks for your assistance  . moreover, i am new on C# and i will be more clear in my question in the future and that is right i need some reading. and i will not use turkish word in the future 
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No worries, and you'll be doing yourself a big favour if you learn a bit about this.
Check OriginalGriff's posting below - that should really get you started in understanding what you need to do to make things work. Good luck!
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Your problem is pretty obvious: Go back to the beginning, and look at what you are doing. I have cut your code down to just the relevant bits.
public partial class Form1 : Form
{
private void button1_Click(object sender, EventArgs e)
{
buton bt = new buton();
bt.kayit(@"C:\Users\Casper\Desktop\a.txt", textBox1.Text);
}
private void button3_Click(object sender, EventArgs e)
{
buton bt = new buton();
bt.silgi(@"C:\Users\Casper\Desktop\a.txt", Convert.ToInt16(textBox3.Text));
}
}
class buton
{
List<string> silici = new List<string>();
public void kayit(string path, string text)
{
silici.Add(text);
Console.WriteLine(silici.Count);
}
public void silgi(string path, int silineceksirasi)
{
Console.WriteLine(silici.Count);
silici.RemoveAt(silineceksirasi); ----> I GET MİSTAKE WHEN ı CLİCK BUTTON3!!!
}
}
If it is still not clear, try running these fragments through the debugger.
No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.
This message is made of fully recyclable Zeros and Ones
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i have solved problem  thanks for your help friends and this is the best site i have ever seen and you are the greats
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can u tell what was the problem u were facing??
Thanks,
Amit Patel
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Hi,
I am able to export dataset into excel using stringwriter and response method using c#.
but i want to save the excel file in a folder without opening the file.
could anyone help out please.
Thanks
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Hey Programmr and amit thanks a lot for giving those url.it was very useful.
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