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How do I redirect to FilterPending.aspx immediately without using any button

public partial class DummyLoginPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DropDownList1.Enabled = true;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("AdminMainMenu.aspx");
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if(DropDownList1.SelectedValue == "Pending Order Status")
{
Response.Redirect("FilterPending.aspx");
}
}
}

How can I go back to the previous page on ASP.Net and C#

Imagine I have a button which has " OnClick="GoBack" " I want it to go to the previous page, how will C# function code look like?

protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
ViewState["RefUrl"] = Request.UrlReferrer.ToString();
}
}
protected void GoBack_Click(object sender, EventArgs e)
{
object refUrl = ViewState["RefUrl"];
if (refUrl != null)
{
Response.Redirect((string)refUrl);
}
}

c# how to make a tabpage visibe to only some users based on roles

private void tabPage3_Click(object sender, EventArgs e)
{
((Control)this.tabPage3).Enabled = false;
}
private void tabPage4_Click(object sender, EventArgs e)
{
if (GloballsClass.Role == "student")
{
((Control)this.tabPage4).Visible = false;
this.tabPage4.Hide();
}
}
private void tabPage1_Click(object sender, EventArgs e)
{
if (GloballsClass.Role == "student")
{
tabPage1.Hide();
}
}
private void WelcomePage_Load(object sender, EventArgs e)
{

I've done this some time ago. The problem is that there is no property Visible and Enabled is doing not the things you would like to do.
So here is how i'm doing it:
// Put this over the constructor
private TabPage tabPage4ToShowForNotStudents = this.tabPage4;
private TabPage tabPage1ToShowForNotStudents = this.tabPage1;
Then you have to subscribe the Load-Method of your Form:
void WelcomePage_Load(object sender, EventArgs e)
{
if (GloballsClass.Role != "student")
{
yourTabControl.TabPages.Add(this.tabPage4ToShowForNotStudents);
yourTabControl.TabPages.Add(this.tabPage1ToShowForNotStudents);
}
}
Now it will add the TabPage to your TabControl if the Role is not student. If it is it will not be added.
Be sure to not have them added in the designer otherwise it will not work.
Hope this is useful :)

thanks guys.i have sorted out the problem.
private void WelcomePage_Load(object sender, EventArgs e)
{
if (GloballsClass.Role == "student")
{
tabControl1.TabPages.Remove(tabPage5);
}
else
{
tabControl1.TabPages.Remove(tabPage4);
}
}

Retrieve data from one form and use it in another form

Alrighty. Here is my problem. I have just about everything done. I just need to take input from the form, and then use it in an algorithm in the second form. I have everything else written up, I just need to know how to connect the 2 so I can write up the last of the code. I've done some research, but none of it seems to go with what I'm trying to do.
Here is the main form.
namespace Airplanes
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
}
private void Arrival_Click(object sender, EventArgs e)
{
ArrivalForm newForm;
newForm = new ArrivalForm();
newForm.ShowDialog();
}
private void Fuel_Click(object sender, EventArgs e)
{
Fuelform newForm2;
newForm2 = new Fuelform();
newForm2.ShowDialog();
}
private void Status_Click(object sender, EventArgs e)
{
}
private void Items_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void NameBox_TextChanged(object sender, EventArgs e)
{
}
private void FuelBox_TextChanged(object sender, EventArgs e)
{
}
private void GateBox_TextChanged(object sender, EventArgs e)
{
}
private void Singlebutton_CheckedChanged(object sender, EventArgs e)
{
}
private void PrivateButton_CheckedChanged(object sender, EventArgs e)
{
}
private void CommercialButton_CheckedChanged(object sender, EventArgs e)
{
}
}
}
And here is the form I'm trying to connect to the main form.
namespace Airplanes
{
public partial class Fuelform : Form
{
public Fuelform()
{
InitializeComponent();
}
private void label1_Click(object sender, EventArgs e)
{
}
private void Fuelform_Load(object sender, EventArgs e)
{
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
}
}
}
Thanks in advance for any answers.

There are a couple of ways...the easiest would probably be to pass the data in through the constructor of your new form.
FuelForm newForm2 = new FuelForm(myData);
And then change the constructor for your FuelForm:
public FuelForm(int myData) // or whatever data type you need
{
// Deal with myData
}

In Source form
destinationForm df = new destinationForm ();
df .myValue= "My Value";
df .ShowDialog();
in Destination Form
private string destVariable;
public string myValue
{
get { return destVariable; }
set { destVariable= value; }
}
then you can use destVariable everywhere in destination form

using PreSendRequestHeaders Event in global.asax

I tried to assign the PreSendRequestHeaders Event in the global.asax file in the "Application_Start" method. But this does not work.
private void Application_Start()
{
PreSendRequestHeaders += OnPreSendRequestHeaders;
}
private void OnPreSendRequestHeaders(object sender, EventArgs e)
{
// this is not called
}
The OnPreSendRequestHeaders is not called, why?
Is it possible to assign the PreSendRequestHeaders method in the global.asax?

Just use:
protected void Application_PreSendRequestHeaders(Object source, EventArgs e)
{
}
Or instantiate the handler:
protected void Application_Start()
{
PreSendRequestHeaders += new EventHandler(OnPreSendRequestHeaders);
}
protected void OnPreSendRequestHeaders(object sender, EventArgs e)
{
// should work now
}