首先将数据库中的用户ID读入某个DataTable，而不是将用户ID分配给另一个标签......

First read user id from your database into some DataTable, than assign the user id to an other label...

Label2.Text = MyDataTable.Rows[0]["user_id"]

No..

You have to read it from database and the use like this


 lblUserID.Text = dt.Rows[0]["user_id"]

成功登录后，在Session中存储所需数据这是在您重定向到新页面之前

When you are successfully logged in then store required data in Session like this before you redirect to new page

Session["FullName"]= //from data
Session[UserId]= //from data

Response.Redirect("NewPage.aspx");

在新页面或任何其他页面，您可以获得此会话

In newpage or any other page you can get this session back

if(Session["FullName"]!=null)
{
    string name= Session["FullName"].ToString();
    int UserID= Convert.ToInt32(Session["UserId"].ToString());
}