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string userpossword;
        SqlConnection conn = new SqlConnection("server=.\\SQL2005;uid=sa;pwd=sa;database=TongXunLuDB");
        string strcon = "select userpassword from UserLoginInfo where username='admin'";
        conn.Open();
        SqlCommand cmd = new SqlCommand(strcon,conn);


      SqlDataReader dr = cmd.ExecuteReader() ;
      userpossword = dr["userpassword"].ToString();
        return userpossword;

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SqlDataReader dr = cmd.ExecuteReader() ;
if(dr.Read())
  {
      userpossword = dr["userpassword"].ToString();
  }
        return userpossword;

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SqlDataReader dr = cmd.ExecuteReader() ;
if(dr.Read())
  {
      userpossword = dr[


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