Date/Time format & multiple selection with listbox problem in ASP.net & C#

[frmsasp]

Hello there,

Currently I am working with the project which needs time format in 24 hours format(in ASP.net & C# langauges) and other features but i am facing problem with them. I have described the problems below in detail to easily understand, so please let me know if you know...

1> How to convert 10:30 pm into 22:30(24 hrs time format)?

2> I had used listbox with multiple selection for display of my item. Following is a example.
1. Item One.
2. Item Two.
3. Item Three.
4. Item Four.
5. Item Five.
Now at the time of record insertion I had select Item Two, Item Four, Item Five. In database I will store its ID with comma delimiter says 2,4,5.
Now in the edit form I want to display selectionbar on old previous item in listbox. so how shall I ?
I had used below code:
for (j=0; j < IdSplit.Length; j++)
{
LstBox.SelectedValue = IdSplit[j].ToString();
}
This will shows selectionbar on last id only. In our example it will shows selectionbar on Item Five, 5.

3> I had created checkbox dynamically with below statement FOR EACH Module.
lblCheck.Text += "<input type='checkbox' name='chk[" + daDetail["Module_id"] + i.ToString() + "]' value='A'>Add
lblCheck.Text += "<input type='checkbox' name='chk[" + daDetail["Module_id"] + i.ToString() + "]' value='E'>Edit
lblCheck.Text += "<input type='checkbox' name='chk[" + daDetail["Module_id"] + i.ToString() + "]' value='D'>Delete
lblCheck.Text += "<input type='checkbox' name='chk[" + daDetail["Module_id"] + i.ToString() + "]' value='S'>
Search Say my Module_Id = 12
After form submit, I got value by form.querystring["chk121"]; form.querystring["chk122"];
form.querystring["chk123"];
form.querystring["chk124"];
but I want to use foreach loop for checking of for loop. Because there are more then 50 modules. so how shall I do this ?

Any help, advice or pointers on this matter would be highly appreciated.

Thanks,
Paresh