c#读取文件写文件

     /// <summary>
    /// 读文件方法
    /// </summary>
    /// <param name="filename">文件名</param>
    /// <returns>文件内容</returns>
    private string ReadFile(string filename)
    {
        string str = "";
        string filenamepath = filename;
        //打开文件
        StreamReader sr = File.OpenText(filenamepath);
        str = sr.ReadToEnd();
        sr.Close();
        return str;
    }

    /// <summary>
    /// 写文件方法
    /// </summary>
    /// <param name="Path">文件名</param>
    /// <param name="Strings">文件内容</param>
    public void WriteFile(string Path, string Strings)
    {
        StreamWriter sw = null;

        try
        {
            sw = new StreamWriter(Path, false, System.Text.Encoding.UTF8);
            sw.Write(Strings);
            sw.Flush();
        }
        catch (Exception exp)
        {
            HttpContext.Current.Response.Write(exp.Message);
            HttpContext.Current.Response.End();
        }
        finally
        {
            sw.Close();
        }
    }