IO

using System.IO;

String csdn="回帖是一种美德！每天回帖即可获得 10 分可用分！";
StreamWriter mysw=new StreamWriter(path);

mysw.Write(csdn);
mysw.Close();

------解决方案--------------------
换个变量名不行吗比如sw   :)

------解决方案--------------------
  private void Form1_Load(object sender, EventArgs e)
       {
           SaveFile("123123123",@"C:\1.txt");  
       }

       public static void SaveFile(string p_Text, string p_Path)
       {
           System.IO.StreamWriter _StreamWriter = new System.IO.StreamWriter(p_Path);
           _StreamWriter.Write(p_Text);
           _StreamWriter.Close();
       }

------解决方案--------------------
探讨

C# codeIO

using System.IO;

String csdn="回帖是一种美德！每天回帖即可获得 10 分可用分！";
StreamWriter mysw=new StreamWriter(path);

mysw.Write(csdn);
mysw.Close();


------解决方案--------------------
string s=dsdfa.ToString();
string f="c:\abc.txt"; /*写上你的文件路径*/
string a="a";  
FileStream fs = new FileStream(f);  
StreamWriter sWriter=new StreamWriter(fs);  
sr.Write(s);
sr.close();  


------解决方案--------------------
更正一下最后两句
sWriter.Write(s);
sWriter.Close();

------解决方案--------------------
探讨

用StreamWriter打开文件,writeline就行了撒


------解决方案--------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
   class Program
   {
       static void Main(string[] args)
       {
           string  csdn = "回帖是一种美德！每天回帖即可获得 10 分可用分！";

           FileStream fs = new FileStream(@"d:\a.txt",FileMode.Append );//一定不要忘记@ 啊
           StreamWriter sr = new StreamWriter(fs);
           sr.WriteLine(csdn);
           sr.Close();
           fs.Close();
        
       }
   }
}


------解决方案--------------------
C# code

using System.IO;

namespace 将string变量保存到txt文档中
{
    class Program
    {
        static void Main(string[] args)
        {
            string csdn="回帖是一种美德！每天回帖即可获得 10 分可用分！";
            //使用Unicode编码，将csdn变量中的内容写到temp.txt文件中
            StreamWriter sw = new StreamWriter("temp.txt", false, Encoding.Unicode);
            sw.Write(csdn);
            sw.Close();
            Console.WriteLine("文件已经成功写入.");
            Console.ReadLine();
        }
    }
}

------解决方案--------------------
C# code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            using (StreamWriter sw = new StreamWriter(@"c:\1.txt", true))  //存在C:\1.txt里面
            {
                string a = "i belive i can fly";
                sw.Write(a);
                sw.Flush();
            }
        }
    }
}