How can I pass objects between ASP pages?

[ebiemami]

I want to pass for example to instance of my employee class to the next page ,
I use CONTEXT
CONTEXT>ITEMS>ADD. ....
and then SERVER>TRANSFER();

but it doesn`t work properly and if i set the properties of these instances to the same class objects in the next page I get:

Object reference not set to an instance of an object

why? I sometimes can use their properties for example in the next page textboxes , but i couldn`t really find a rule for that , it doesn`t usually work

CAN I USE OTHER THINGS RATHER THAN CONTEXT?
if yes pleas show me the code,
I USE C# CODE

[dnanetwork]

use session, profile object....works...

hope it helps..!

[sonia sardana]

Suppose I havv two forms Default3.aspx & Default4.aspx,I m passing the values from Default3.aspx to Default4.aspx-

First method-
Passing values using Query String Method-

Default3.aspx 

 protected void Button2_Click(object sender, EventArgs e)
    {
        
        Response.Redirect("Default4.aspx?username=" + TextBox1.Text +  "&PASSWORD=" + TextBox2 .Text );
    }

Default4.aspx 
protected void Page_Load(object sender, EventArgs e)
    {
       
        Response.Write(Request["username"]);
        Response.Write(Request["password"]);
    }

Second Method
passing values using Session Method

Default3.aspx 
protected void Button1_Click(object sender, EventArgs e)
    {
        Session["NAME"] = TextBox1.Text;
        Response.Redirect("Default4.aspx");
    }

Default4.aspx

 protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write(Session["Name"]);
       
    }

hey dnanetwork, can u plz telll me what is profile object???

Secondly,tell me one thing is it necessary to match case while passing values means username & USERNAME are same

[dnanetwork]

Profile Object is good....

http://msdn.microsoft.com/en-us/library/2y3fs9xs.aspx

[Ramesh S]

Hi,

If Profile object is used, then we need to use SQL Server. Because Profile data will be stored in SQL Server. Also basically Profile object is used to web site personalization.

I would recommend Session to pass custom objects between pages.

To store an object to sesssion

Employee emp = new Employee();
emp.Ename = txtEname.Text;
emp.Empno = int.Parse(txtEmpNo.Text);
emp.Salary = double.Parse(txtSal.Text);
...
...
...
Session["Emp"] = emp;

To retrieve Employee object from Session

Employee emp = (Employee)Session["Emp"];
txtEname.Textc = emp.Ename ;
txtEmpNo.Text = emp.Empno.ToString();
txtSal.Text = emp.Salary.ToString();

[dnanetwork]

yes you are correct ramesh...thank you for correcting me..

[sonia sardana]

hey tell me one thing,when we need to use profile object......I thk so its hardly use,cz we have session to pass data between pages....

[kvprajapati]

To persist a state of an object between requests you may use:

1. Client side state management
   • Cookies - String datatype only
   • ViewState - Any datatype (serializable)
   • Hidden Fields - String type
   • Query Strings - String type
2. Server side state management
   • Session - Any datatype (serializable)
   • Profile - Any datatype (serializable)