protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
    SqlConnection con = new SqlConnection();
    con.ConnectionString = "server=(local);database=Meet;Integrated Security=SSPI";// 创建命令（SqlCommand）对象(cmd)
    SqlCommand cmd = new SqlCommand();
    cmd.Connection = con; // 指示命令发给哪个数据库
    cmd.CommandType = CommandType.Text; // 指示是什么类型的命令
    cmd.CommandText = "select * from [care] where NAME_user = '" + this.Label3.Text.ToString() + " ' and TITLE_meet = '" + this.titlelabel.Text.ToString() + " '";
    con.Open();
    SqlDataReader reader = cmd.ExecuteReader();
    try
    {
        if (reader.Read())
        {
            reader.Close();
            Response.Write(" <script>alert(' 您已关注过此会议 ') </script>");
        }
        else
        {
            reader.Close();
            cmd.CommandText = "update [meet] set HOT_meet = HOT_meet + 1 where TITLE_meet='" + this.titlelabel.Text.ToString() + "'";
            SqlCommand cmd2 = new SqlCommand();
            cmd2.Connection = con;
            cmd2.CommandType = CommandType.Text;
            cmd2.CommandText = "insert into [care](NAME_user,TITLE_meet) values(@nameuser,@meettitle)";
            cmd2.Parameters.Add("@nameuser",SqlDbType.VarChar,50);
            cmd2.Parameters["@nameuser"].Value = Label3.Text;
            cmd2.Parameters.Add("@meettitle", SqlDbType.VarChar,100);
            cmd2.Parameters["@meettitle"].Value = titlelabel.Text;
            int i = cmd.ExecuteNonQuery();
            Response.Write("<script>alert('您已经关注成功');</script>");
            hotlabel.Text = Convert.ToString(Convert.ToInt32(hotlabel.Text) + 1);

        }

        con.Close();
    }
    catch
    {
    }


}