how to save the values in session and arraylist

nagaraju

15y4.3kC#

Hi,

i am developting one question paper. now i want to save the question no and answer in a session using arraylist. how can i save . in .net i am using this code i stroed both question no and answer . now i want the same code in silverlight. but in silverlight i am not getting both arraylist and sessions . how can i achieve this one.

private void SaveCheckedValues()
    {
        ArrayList userdetails1 = new ArrayList();
        ArrayList userdetails2 = new ArrayList();
        ArrayList userdetails3 = new ArrayList();
        ArrayList userdetails4 = new ArrayList();

        int index = -1;
        foreach (GridViewRow gvrow in GV_Questionpaper.Rows)
        {
            index = (int)GV_Questionpaper.DataKeys[gvrow.RowIndex].Value;
            bool result1 = ((RadioButton)gvrow.FindControl("RBtn_Option1")).Checked;
            bool result2 = ((RadioButton)gvrow.FindControl("RBtn_Option2")).Checked;
            bool result3 = ((RadioButton)gvrow.FindControl("RBtn_Option3")).Checked;
            bool result4 = ((RadioButton)gvrow.FindControl("RBtn_Option4")).Checked;

if (Session["CHECKED_ITEMS1"] != null)
            {
                userdetails1 = (ArrayList)Session["CHECKED_ITEMS1"];
            }
            if (Session["CHECKED_ITEMS2"] != null)
            {
                userdetails2 = (ArrayList)Session["CHECKED_ITEMS2"];
            }
            if (Session["CHECKED_ITEMS3"] != null)
            {
                userdetails3 = (ArrayList)Session["CHECKED_ITEMS3"];
            }
            if (Session["CHECKED_ITEMS4"] != null)
            {
                userdetails4 = (ArrayList)Session["CHECKED_ITEMS4"];
            }

if (result1)
            {
                if (!userdetails1.Contains(index))
                    userdetails1.Add(index);
            }
            else
            {
                userdetails1.Remove(index);
            }
            if (result2)
            {
                if (!userdetails2.Contains(index))
                    userdetails2.Add(index);
            }
            else
            {
                userdetails2.Remove(index);
            }
            if (result3)
            {
                if (!userdetails3.Contains(index))
                    userdetails3.Add(index);
            }
            else
            {
                userdetails3.Remove(index);
            }
            if (result4)
            {
                if (!userdetails4.Contains(index))
                    userdetails4.Add(index);
            }
            else
            {
                userdetails4.Remove(index);
            }

Thanks
P.Nagaraju

8 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes15y ago
As with all web based technologies, Silverlight has problems in maintaining state.

However, you can store information on the client machine using isolated storage. Check out this article:

http://blogs.silverlight.net/blogs/msnow/archive/2008/07/16/tip-of-the-day-19-using-isolated-storage.aspx
nagaraju15y ago
Hi Vulpes,

i have one doubt is it possible to maintain state in silverlight? can u please confirme me once.

Thanks

P.Nagaraju
Vulpes15y ago
Sorry, I'd forgotten that Silverlight doesn't support the ArrayList class.

You'll have to use the generic List class instead which works much the same but is strongly typed.

So, if you're adding strings to your ArrayList you'll need to add them to a List instead. For example:

ArrayList list = new ArrayList();
list.Add("nagaraju"); // store
string user = (string)list[0]; // retrieve

is equivalent to:

List list = new List();
list.Add("nagaraju"); // store
string user = list[0]; // retrieve (no need for the cast, now)
nagaraju15y ago
Hi Vulpes,

i am not getting arraylist also . i am writing in xaml.cs file. the silverlight application will not support the arraylist also. can u please tell me solution for that also.

if i write the code in wcf service i could not find my datagrid contol . so i have to write in xaml.cs file

Thanks
P.Nagaraju
Vulpes15y ago
If you're going to use the WCF service approach, then you need to define methods to get and set a session variable:

[OperationContract]
public object GetSessionVariable(string key)
{
return System.Web.HttpContext.Current.Session[key];
}

[OperationContract]
public void SetSessionVariable(string key, object value)
{
System.Web.HttpContext.Current.Session[key] = value;
}

The code you posted which is getting session variables, will then need to be changed to the following:

private void SaveCheckedValues()
{
ArrayList userdetails1 = new ArrayList();
ArrayList userdetails2 = new ArrayList();
ArrayList userdetails3 = new ArrayList();
ArrayList userdetails4 = new ArrayList();

int index = -1;
foreach (GridViewRow gvrow in GV_Questionpaper.Rows)
{
index = (int)GV_Questionpaper.DataKeys[gvrow.RowIndex].Value;
bool result1 = ((RadioButton)gvrow.FindControl("RBtn_Option1")).Checked;
bool result2 = ((RadioButton)gvrow.FindControl("RBtn_Option2")).Checked;
bool result3 = ((RadioButton)gvrow.FindControl("RBtn_Option3")).Checked;
bool result4 = ((RadioButton)gvrow.FindControl("RBtn_Option4")).Checked;

if (GetSessionVariable("CHECKED_ITEMS1") != null)
{
userdetails1 = (ArrayList)GetSessionVariable("CHECKED_ITEMS1");
}
if (GetSessionVariable("CHECKED_ITEMS2") != null)
{
userdetails2 = (ArrayList)GetSessionVariable("CHECKED_ITEMS2");
}
if (GetSessionVariable("CHECKED_ITEMS3") != null)
{
userdetails3 = (ArrayList)GetSessionVariable("CHECKED_ITEMS3");
}
if (GetSessionVariable("CHECKED_ITEMS4") != null)
{
userdetails4 = (ArrayList)GetSessionVariable("CHECKED_ITEMS4");
}

if (result1)
{
if (!userdetails1.Contains(index))
userdetails1.Add(index);
}
else
{
userdetails1.Remove(index);
}
if (result2)
{
if (!userdetails2.Contains(index))
userdetails2.Add(index);
}
else
{
userdetails2.Remove(index);
}
if (result3)
{
if (!userdetails3.Contains(index))
userdetails3.Add(index);
}
else
{
userdetails3.Remove(index);
}
if (result4)
{
if (!userdetails4.Contains(index))
userdetails4.Add(index);
}
else
{
userdetails4.Remove(index);
}

You haven't posted any code where you create or update session variables but, in general, where you have a line like this:

Session[key] = arrayList;

you need to replace it with this:

SetSessionVariable(key, arrayList);
nagaraju15y ago
Hi,

i want to save the question no and answer and i have to maintain them in session .can anybody send me the code for storing the values and populating the values

Thanks

P.Nagaraju
Vulpes15y ago
Probably the best way would be to use a WCF Service.

Check out : http://www.dotnetspider.com/Silverlight-Tutorial-316.aspx
Jaganathan Bantheswaran15y ago
Hi,

There is no session in Silverlight, We have to do as this article