很郁闷呀,大家帮我看看是啥毛病吧,还是修改不了
private   void   Page_Load(object   sender,   System.EventArgs   e)
{
if(!this.IsPostBack   )
{ SqlConnection   con=DB.createConnection   ();
con.Open();
SqlCommand   cmd=new   SqlCommand   ( "select   votetitle   from   votemaster   where   voteid= "+voteid,con);
this.lbshowtitle.Text   =Convert.ToString   (cmd.ExecuteScalar   ());
SqlCommand   cmditems=new   SqlCommand   ( "select   votedetailsid,voteitems   from   votedetails   where   voteid= "+this.voteid   ,con);
SqlDataReader   reader=cmditems.ExecuteReader   ();
this.rbtnlist   .DataSource   =reader;
this.rbtnlist   .DataTextField   = "voteitems ";
this.rbtnlist   .DataValueField   = "votedetailsid ";
this.rbtnlist   .DataBind   ();
reader.Close   ();
}上面这是初始化,将表中的记录绑定到radiobuttonlist上,绑定成功
下面这段我是想点击radiobutton选项,再点击votebtn按钮,实现修改数据库记录的值,就是不行
private   void   btnvote_Click(object   sender,   System.EventArgs   e)
{        


SqlConnection   con=DB.createConnection   ();
con.Open   ();
SqlCommand   cmd=new   SqlCommand   ();
        cmd.Connection   =con;
        cmd.CommandText   = "update   votedetails   set   votesum=votesum+1   where   voteid= "+voteid+ "   and   votedetailsid= "+this.rbtnlist   .SelectedValue   .ToString   ();  
cmd.ExecuteNonQuery   ();
con.Close   ();
望高手能详细指点一下,谢谢啦,今天真的好郁闷,一上午都没查出毛病


------解决方案--------------------
SqlCommand cmditems=new SqlCommand ( "select votedetailsid,voteitems from votedetails where voteid= "+this.voteid ,con);
SqlDataReader reader=cmditems.ExecuteReader ();
this.rbtnlist .DataSource =reader;
this.rbtnlist .DataTextField = "voteitems ";
this.rbtnlist .DataValueField = "votedetailsid ";
this.rbtnlist .DataBind ();

建议用DataTable绑定到控件, SqlDataReader好象不太合适, 那对象是要Read的.