20151102adonet2

string strSql = string.Format("select count(*) from RNews where NewsId={0}", newsId);
using (con=new SqlConnection(strCon))
{
    con.Open();
    using (cmd=new SqlCommand(strSql,con))
    {
        if (Convert.ToInt32(cmd.ExecuteScalar().ToString()) == 0)//获取结果集数据,如果没有值就返回0 删除之前判断ID是否存在
        {
            Response.Write("<script>alert(‘这条新闻不存在‘)</script>");
            return;
        }

        else
        {
            string s = string.Format("delete RNews where NewsId={0}",newsId);
                using (cmd=new SqlCommand(s,con))
                {
                    cmd.ExecuteNonQuery();
                }
        }
    }

}
BindNews();
Response.Write("<script>alert(‘新闻删除成功‘)</script>");

using (con=new SqlConnection(strCon))
{
    con.Open();
    string strSql = GetSql();
    cmd = new SqlCommand(strSql,con);
    using(read=cmd.ExecuteReader())
    {
        if (read.HasRows)
        {
            gvRNews.DataSource = read;
            gvRNews.DataBind();
        }
        else
        {
            gvRNews.DataSource = null;
            gvRNews.DataBind();

        }
    }
}