How can itereate through checkboxes using forlopp in C#? - asp.net

Question

I need to check whether the checkbox values are ticked or not using 'for' loop.
CheckBox chkBox = (CheckBox)tab_patients.Controls[chk + i];
from searches i got this line. what this tab_patients denote ?`
string chk = "CheckBox";
for (int i = 1; i < 13; i++)
{
for (int k = 1; k < 4; k++)
{
// CheckBox chkBox = (CheckBox)tab_patients.Controls[chk + i];
CheckBox cb = (CheckBox)this.Page.Form.FindControl("chk"+i.ToString());
if(cb.Checked==true)
{
check = i + "0" + k;
}
}}

Answer 1

Make your life easier and create the checkboxes with checkboxlists: http://msdn.microsoft.com/de-de/library/system.web.ui.webcontrols.checkboxlist.aspx
<asp:CheckBoxList ID="SomeElement" runat="server"
AutoPostBack="true"
RepeatColumns="4"
EnableViewState="true">
</asp:CheckBoxList>
With the Repeatcolumns property you are telling the element, that you infact want 4 columns, so the control will devide your 32 elements by 4 and group those checkboxes by the pack of 8.
After this, you can iterate through every list like this:
foreach(var cb in checkboxlistID)
{
if(cb.Checked)
{
//do something
}
}
On top of that, here is some old code showing you how to fill a checkboxlist with data fetched from a SQL-query. You can ignore the if expression, which is checking if there is cached data, from which to fill all the checkboxes.
using (OleDbConnection connection = new OleDbConnection(ConfigurationManager.ConnectionStrings["database"].ConnectionString))
{
string Query = #"SELECT * from level";
OleDbCommand command = new OleDbCommand(Query, connection);
if (Session["SavedLevelItems"] != null)
{
CheckBoxListLevel.Items.Clear();
List<ListItem> SessionList = (List<ListItem>)Session["SavedLevelItems"];
foreach (var item in SessionList)
{
try
{
CheckBoxListLevel.Items.Add(item);
}
catch { }
}
}
else
{
connection.Open();
CheckBoxListLevel.DataTextField = "bez_level";
CheckBoxListLevel.DataValueField = "id_level";
OleDbDataReader ListReader = command.ExecuteReader();
CheckBoxListLevel.DataSource = ListReader;
CheckBoxListLevel.DataBind();
ListReader.Close(); ListReader.Dispose();
}
}