asp.net2.0之OA系统

SqlConnection mycon=new SqlConnection("server=.;database=xbdzzw;uid=sa;pwd="); mycon.Open(); SqlCommand mycmd= new SqlCommand("select * from stocksurr where id=5",mycon); SqlDataReader dr= mycmd.ExecuteReader(); byte [] b1=(byte[])dr["document"]; // string values=System.Text.Encoding.GetEncoding("gb2312").GetString(ib,0,2); MemoryStream ms=new MemoryStream(b1); richTextBox1.LoadFile(ms,System.Windows.Forms.RichTextBoxStreamType.UnicodePlainText); mycon.Close();