using System.io;

fileStream fs=new fileStream ("yourtxt.txt",fileMode.Create);
StreamWirte sw=new StreamWirte (fs);
sw.WriteLine(textbox.Text);
sw.Close();
fs.Close();

------解决方案--------------------
楼上已经把代码展出来了！

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


using System.IO;

//写入
StreamWriter sw = new StreamWriter( @"C:\temp123.txt");
sw.WriteLine("----------------hello----------------");
sw.WriteLine("内容");
sw.WriteLine("----------------hello----------------");
sw.Flush();
sw.Close();

//读取
System.IO.StreamReader st;
st = new System.IO.StreamReader(@"C:\temp123.txt", System.Text.Encoding.UTF8);//UTF8为编码
this.textBox1.Text = st.ReadToEnd();

------解决方案--------------------
StreamWriter和StreamReader

------解决方案--------------------
探讨

C# code

using System.IO;

//写入
StreamWriter sw = new StreamWriter( @"C:\temp123.txt");
sw.WriteLine("----------------hello----------------");
sw.WriteLine("内容");
sw.WriteLine("----------------hello----------------");
sw.Flush();
sw.Close();

//读取
System.IO.StreamReader st;
st = new System.IO.StreamReader(@"C:\temp123.txt", System.Text.Encoding.UTF8);//UTF8为编码
this.textBo…


------解决方案--------------------
 他们都把代码贴出来了,你google一下一大堆.
我也是用的StreamWriter和StreamReader

------解决方案--------------------
        while (sr.EndOfStream == false)
       {
            string ss=sr.ReadLine();  
            this.listBox1.Items.add(ss);
       }

------解决方案--------------------
探讨

用StreamWriter和StreamReader  我就用这种


------解决方案--------------------
探讨

        while (sr.EndOfStream == false) 
        { 
            string ss=sr.ReadLine(); 
            this.listBox1.Items.add(ss); 
        }


------解决方案--------------------
探讨

我现在要从文件里读取多行添加到listbox里边，我用StreamReader sr=new StreamReader（、、、、、)

string ss=sr.ReadLine(); this.listBox1.Items.add(ss),只能将一行数据插入到listbox中，请问应该怎样将所有的添加到listbox中


------解决方案--------------------
探讨

C# code

using System.IO;

//写入
StreamWriter sw = new StreamWriter( @"C:\temp123.txt");
sw.WriteLine("----------------hello----------------");
sw.WriteLine("内容");
sw.WriteLine("----------------hello----------------");
sw.Flush();
sw.Close();