如何读取或写入文本文件，使用ASP.NET

当我运行如何读取或写入文本文件，使用ASP.NET的代码，但它提供了一个错误: -

60;

protected void Button3_Click(object sender, EventArgs e)

    {

        string path = FileUpload1.PostedFile.FileName;

        if(!string.IsNullOrEmpty(path))

        {

            string[] readText=File.ReadAllLines(path);

            StringBuilder strbuild=new StringBuilder();

            foreach(string s in readText)

            {

                strbuild.Append(s);

                strbuild.AppendLine();

                   

            }

            TextBox2.Text=strbuild.ToString();

        }

        

    }

Could not find file 'C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\aaaaaa.txt'.