how do i retain values from pages in asp.net - asp.net

Question

I need help with "retaining" values from one page to another example i answered the first page and proceed to the 2nd if i click "previous page" how can i keep my answers there.
Below are my codes:
protected void Button1_Click(object sender, EventArgs e)
{
//string sesrbl1;
string selectedvalue = RadioButtonList2.SelectedValue.ToString();
string selectedvalue2 = RadioButtonList4.SelectedValue.ToString();
string selectedvalue3 = RadioButtonList6.SelectedValue.ToString();
string selectedvalue4 = RadioButtonList8.SelectedValue.ToString();
string selectedvalue5 = RadioButtonList14.SelectedValue.ToString();
string selectedvalue6 = RadioButtonList11.SelectedValue.ToString();
bool risk;
SqlCommand cmd = new SqlCommand();
SqlConnection sqlcon = new SqlConnection("Data Source=DBASE;Initial Catalog=TumorRegistry;User ID=sa");
try
{
//Session["rb1"] = RadioButtonList12.SelectedValue;
//Session["rb2"] = RadioButtonList3.SelectedValue;
//Session["rb3"] = RadioButtonList5.SelectedValue;
//Session["rb4"] = RadioButtonList7.SelectedValue;
//Session["rb5"] = RadioButtonList13.SelectedValue;
if (RadioButtonList12.SelectedItem.Text== "FALSE")
{
if (bool.TryParse("False", out risk))
{
risk = false;
Session["rb1"] = risk;
}
}
if (RadioButtonList12.SelectedItem.Text == "TRUE")
{
if (bool.TryParse(RadioButtonList12.SelectedItem.Text, out risk))
{
risk = true;
Session["rb1"] = risk;
}
}
if (RadioButtonList3.SelectedItem.Text == "FALSE")
{
if (bool.TryParse(RadioButtonList3.SelectedItem.Text, out risk))
{
risk = false;
Session["rb2"] = risk;
}
}
if (RadioButtonList3.SelectedItem.Text== "TRUE")
{
if (bool.TryParse(RadioButtonList3.SelectedItem.Text, out risk))
{
risk = true;
Session["rb2"] = risk;
}
}
if (RadioButtonList5.SelectedItem.Text == "FALSE")
{
if (bool.TryParse(RadioButtonList5.SelectedItem.Text, out risk))
{
risk = false;
Session["rb3"] = risk;
}
}
if (RadioButtonList5.SelectedItem.Text == "TRUE")
{
if (bool.TryParse(RadioButtonList5.SelectedItem.Text, out risk))
{
risk = true;
Session["rb3"] = risk;
}
}
if (RadioButtonList7.SelectedItem.Text == "FALSE")
{
if (bool.TryParse(RadioButtonList7.SelectedItem.Text, out risk))
{
risk = false;
Session["rb4"] = risk;
}
}
if (RadioButtonList7.SelectedItem.Text == "TRUE")
{
if (bool.TryParse(RadioButtonList7.SelectedItem.Text, out risk))
{
risk = true;
Session["rb4"] = risk;
}
}
if (RadioButtonList13.SelectedItem.Text == "FALSE")
{
if (bool.TryParse(RadioButtonList13.SelectedItem.Text, out risk))
{
risk = false;
Session["rb5"] = risk;
}
}
if (RadioButtonList13.SelectedItem.Text == "TRUE")
{
if (bool.TryParse(RadioButtonList13.SelectedItem.Text, out risk))
{
risk = true;
Session["rb5"] = risk;
}
}
if (selectedvalue.ToString() == "0")
{
selectedvalue = null;
}
else if (selectedvalue2.ToString() == "0")
{
selectedvalue2 = null;
}
else if (selectedvalue3.ToString() == "0")
{
selectedvalue3 = null;
}
else if (selectedvalue4.ToString() == "0")
{
selectedvalue4 = null;
}
else if (selectedvalue5.ToString() == "0")
{
selectedvalue6 = null;
}
//Session["rb1"] = RadioButtonList12.SelectedValue;
//Session["rb2"] = RadioButtonList3.SelectedValue;
//Session["rb3"] = RadioButtonList5.SelectedValue;
//Session["rb4"] = RadioButtonList7.SelectedValue;
//Session["rb5"] = RadioButtonList13.SelectedValue;
//sending values to the submit button next page
Session["Holdtextbox1"] = RadioButtonList2.SelectedValue.ToString();
Session["Holdtextbox2"] = RadioButtonList4.SelectedValue.ToString();
Session["Holdtextbox3"] = RadioButtonList6.SelectedValue.ToString();
Session["Holdtextbox4"] = RadioButtonList8.SelectedValue.ToString();
Session["Holdtextbox5"] = RadioButtonList14.SelectedValue.ToString();
Session["Holdtextbox6"] = RadioButtonList11.SelectedValue.ToString();
selectedvalue = Session["Holdtextbox1"].ToString();
selectedvalue2 = Session["Holdtextbox2"].ToString();
selectedvalue3 = Session["Holdtextbox3"].ToString();
selectedvalue4 = Session["Holdtextbox4"].ToString();
selectedvalue5 = Session["Holdtextbox5"].ToString();
selectedvalue6 = Session["Holdtextbox6"].ToString();
Response.Redirect("WebForm1.aspx");
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
that's for the first page
here's for the 2nd page i have 2 buttons button 1 and 2
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("Default.aspx");
////Button1.Attributes.Add("onClick", "javascript:history.back(); return false;");
// Response.Redirect("Default.aspx");
}
public void SaveRecord()
{
try
{
Holdtextbox1.Text = Session["Holdtextbox1"].ToString();
Holdtextbox2.Text = Session["Holdtextbox2"].ToString();
Holdtextbox3.Text = Session["Holdtextbox3"].ToString();
Holdtextbox4.Text = Session["Holdtextbox4"].ToString();
Holdtextbox5.Text = Session["Holdtextbox5"].ToString();
Holdtextbox6.Text = Session["Holdtextbox6"].ToString();
sqlcon.Open();
SqlCommand cmd = new SqlCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Connection = sqlcon;
SqlDataAdapter DA = new SqlDataAdapter();
// string SqlInsert = "Insert into tbTRcBase (HPN,ISH, Asthma, DM, OtherCo,HPNTreatment, ISHTreatment,AsthmaTreatment, DMTreatment, OtherCoTreatment,SecondHandSmoke,Smoker, StopSmoking , Occupation , CancerFamilyHistory, FamilyWithCancer,ParentWithCancer) values ('" + bitsess.Text + "','" + bitsess2.Text + "','" + bitsess3.Text + "','" + bitsess4.Text + "','" + bitsess5.Text + "','" + Holdtextbox1.Text + "','" + Holdtextbox2.Text + "','" + Holdtextbox3.Text + "','" + Holdtextbox4.Text + "','" + Holdtextbox5.Text + "','" + Holdtextbox6.Text + "','" + rb1.SelectedValue.ToString() + "','" + rb2.SelectedValue.ToString() + "','" + cb1.Text + "','" + rb3.Text + "','" + cb2.Text + "','" + rb4.Text + "')";
string SqlInsert = "Insert into tbTRcBase (HPN,ISH, Asthma, DM, OtherCo,HPNTreatment, ISHTreatment,AsthmaTreatment, DMTreatment, OtherCoTreatment,SecondHandSmoke,Smoker, StopSmoking , Occupation , CancerFamilyHistory, FamilyWithCancer,ParentWithCancer) values ('" + Session["rb1"] + "','" + Session["rb2"] + "','" + Session["rb3"] + "','" + Session["rb4"] + "','" + Session["rb5"] + "','" + Holdtextbox1.Text + "','" + Holdtextbox2.Text + "','" + Holdtextbox3.Text + "','" + Holdtextbox4.Text + "','" + Holdtextbox5.Text + "','" + Holdtextbox6.Text + "','" + rb1.SelectedValue.ToString() + "','" + rb2.SelectedValue.ToString() + "','" + cb1.Text + "','" + rb3.Text + "','" + cb2.Text + "','" + rb4.Text + "')";
// string SqlInsert = "Insert into tbTRcBase (HPN, HPNTreatment) values ('" + Session["rb1"] + "','" + Holdtextbox1.Text + "')";
DA = new SqlDataAdapter(SqlInsert, sqlcon);
DataTable dt = new DataTable();
DA.Fill(dt);
sqlcon.Close();
Response.Write("<script language='javascript'>alert('" + " Data has been saved " + "')</script>");
}
catch (Exception e)
{
Response.Write("<script language='javascript'>alert('" + e.Message + "')</script>");
}
}

Answer 1

For retaining the values on the previous page, you would have to make use of those Session variables that you have stored on the same page before you pass them onto the next page.
On the Page_Load event of the previous page, make a function that just binds the respective controls based on the values of those Session variables.
Something like this :
public void BindData()
{
Holdtextbox1.Text = Session["Holdtextbox1"].ToString();
.
.
.
//all your controls and the Session values.
}
Hope this helps.