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C # Use session for login

Source: Internet
Author: User
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<! Doctype html public "-// W3C // dtd html 4.0 Transitional // EN">
<% @ Import Namespace = "System. Data. SqlClient" %>
<% @ Import Namespace = "System. Data" %>
<HTML>
<HEAD>
<TITLE> logon example </TITLE>
<Meta name = "Generator" CONTENT = "EditPlus">
<Meta name = "Author" CONTENT = "">
<Meta name = "Keywords" CONTENT = "">
<Meta name = "Description" CONTENT = "">
<Script Language = "C #" runat = "server">
Void Add_Click (Object sender, EventArgs e)
{
String str_id = Tel1.Text;
String str_name = Tel2.Text;
// Session ["id"] = str_name;
// Session ["UserName"] = str_name;
SqlCommand myCommand;
String myselect;
String myConnString = @ "server = localhost; uid = sa; pwd =; database = test ";
SqlConnection myConnection = new SqlConnection (myConnString );
MyConnection. Open ();
Myselect = "Select * from test where id =" + Tel1.Text + "and name =" + Tel2.Text + "";
MyCommand = new SqlCommand (myselect, myConnection );
SqlDataReader reader = myCommand. ExecuteReader ();
// SqlDataReader reader = myCommand. ExecuteReader ();
If (Tel1.Text = "" | Tel2.Text = "")
{
Label1.Text = "student ID name cannot be blank ";
}
Else if (Session ["UserName"]! = Null | Session ["id"]! = Null)
{
Label1.Text = "you have logged on ";
}
Else if (! Reader. Read ())
{
Label1.Text = "the database has no information! ";
Reader. Close ();
}
Else
{
Label1.Text = "Login successful ";
// Label. Text = Session ["Username"]. ToString ();
// Reader. Close ();
Tel1.Text = "";
Tel2.Text = "";
Session ["UserName"] = str_name ;;
Session ["id"] = str_id;
// Response. Redirect ("first3.aspx ");
}
MyConnection. Close ();
}

</Script>
</HEAD>

<BODY>
<Form runat = "server">
Student id: <asp: TextBox id = "Tel1" size = "20" runat = "server"/>
<P>
Name: <asp: TextBox id = "Tel2" size = "20" runat = "server"/>
<P>
<Asp: Button id = "Add" onClick = "Add_Click" runat = "server" Text = "login"> </asp: Button>
<P>
<Asp: Label id = "Label1" runat = "server"/>
</Form>
</BODY>
</HTML>

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