就是想实现按一个按钮后，自动的创建一个txt文本，然后把数据写入到txt中，不知道怎么实现呀！谢谢
在DELPHI中是这样子，可不懂DELPHI呀，
procedure Tfm_main.writetxt(s:string);
var
vfilename:string;
fh:Textfile;
begin
vfilename:='kqrec.txt';
AssignFile(fh,vfilename);
if FileExists(vfilename) then append(fh)
else rewrite(fh);
writeln(fh,s);
closefile(fh);
end;

[此贴子已经被作者于2006-11-20 18:38:37编辑过]

在C#中..可以用流Stream啊...
看看Msdn吧..
StreamWriter这些..

StreamWriter sw=new StreamWriter(文件路径);
sw.Write(s);
sw.Close();

using System;
using System.IO;
public class TextToFile
{
private const string FILE_NAME = "MyFile.txt";
public static void Main(String[] args)
{
if (File.Exists(FILE_NAME))
{
Console.WriteLine("{0} already exists.", FILE_NAME);
return;
}
using (StreamWriter sw = File.CreateText(FILE_NAME))
{
sw.WriteLine ("This is my file.");
sw.WriteLine ("I can write ints {0} or floats {1}, and so on.",
1, 4.2);
sw.Close();
}
}
}

摘自msdn。。
可以查询streamwriter..
最底下有 “向文本中写入数据”

我自己写的，没有文件则创建然后加入数据，文件存在则直接加入数据 。。
file 类要引用system.IO;
应该是满足你的要求的。

private void button1_Click(object sender, EventArgs e)
{
string path = @"D:\MyTestListener100.txt";
if (!File.Exists(path))
{
// Create a file to write to.
using (StreamWriter sw = File.CreateText(path))
{
sw.WriteLine(textBox1.Text);

}
}
else
{
// This text is always added, making the file longer over time
// if it is not deleted.
using (StreamWriter sw = File.AppendText(path))
{
sw.WriteLine(textBox1.Text);

}
}
}