64位win7 c#读取数据库中照片信息

写了一个简单的练习,从数据表中读取照片信息,存储到电脑的磁盘,系统是64位win7,总是提示exception:对路径"E:"的访问被拒绝,请问怎样解决啊
 private void button1_Click(object sender, EventArgs e)
        {
             GetAndWriteData(@"e:\");
        }        private void GetAndWriteData(string path)
        {
            try
            {
                Byte[] blob = null;
                FileStream fs = null;
                 string   strCnn   =   "server=192.168.1.153;Initial Catalog=StudentsManageDB;UID=sa;PWD=1976421"; 
                //string strCnn = this.ConnectString;
                 string   strSql   =   "select ImageContent   from tmp4"; 
                //string strSql = "select   " + this.DataFieldName + "   from   " + this.TableName + "   where   " + this.IDFieldName + "   =   ' " + this.FileID + " ' ";                SqlConnection Cnn = new SqlConnection(strCnn);
                SqlCommand Cmd = new SqlCommand(strSql, Cnn);
                Cnn.Open();
                SqlDataReader sReader = Cmd.ExecuteReader();
                sReader.Read();
                blob = new Byte[(sReader.GetBytes(0, 0, null, 0, int.MaxValue))];
                sReader.GetBytes(0, 0, blob, 0, blob.Length);
                sReader.Close();
                Cnn.Close();
                fs = new FileStream(path, FileMode.Create, FileAccess.Write);                fs.Write(blob, 0, blob.Length);
                fs.Close();            }
            catch (SqlException ex)
            {
                MessageBox.Show("Sql   Exception:   " + ex.Message);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Exception:   " + ex.Message);
            }
        }
    }
}