我的代码那错了啊。。。。。
       CollectSelected();

        this.TextBox6.Text = string.Empty;
        foreach (object tmp in this.SelectedItems)
            this.TextBox6.Text += tmp.ToString() + ",";
        string a = this.TextBox6.Text;        
        a = a.TrimEnd(',');
        SqlConnection con = new SqlConnection("server=localhost;database=User;user=grid;password=grid");
        con.Open();
        SqlCommand com = new SqlCommand("(update Message set huiyuanjiezhishijian='" + this.Text1.Value + "' where ID in('" + a +"'))", con);
        SqlDataAdapter da = new SqlDataAdapter(com);
        DataSet ds = new DataSet();
        Response.Write(a+"-----------------");
        con.Close();
为什么数据没有更新啊。。。。。。。

CollectSelected();

        this.TextBox6.Text = string.Empty;
        foreach (object tmp in this.SelectedItems)
            this.TextBox6.Text += tmp.ToString() + ",";
        string a = this.TextBox6.Text;        
        a = a.TrimEnd(',');
        SqlConnection con = new SqlConnection("server=localhost;database=User;user=grid;password=grid");
        con.Open();
        SqlCommand com = new SqlCommand("update Message set huiyuanjiezhishijian='" + this.Text1.Value + "' where ID ='" + a +"'", con);
        SqlDataAdapter da = new SqlDataAdapter(com);
        DataSet ds = new DataSet();
        Response.Write(a+"-----------------");
        con.Close();

不行啊，还是不行。。。。。。。。数据更新不进去。。。。。。。。

我的ID是字符串。不能那么写的，只能用where id in（）这个形式。。。。

把语句输出来到数据库中去执行一下看可以不

SqlCommand com = new SqlCommand("update Message set huiyuanjiezhishijian='" + this.Text1.Value + "' where ID ='" + a +"'", con);
完了呢？
com不需要再调用个ExecuteNonQuery()方法执行一下吗？


SqlDataAdapter da = new SqlDataAdapter(com);
DataSet ds = new DataSet();
这两句做什么的？好像没用吧